网站结构分析怎么写,深圳宝安大仟里,佛山网站seo优化,买房子上哪个网站最好目录 前言API构造函数四则及幂运算其他 代码BigDecimal.dartbigdecimal_test.dart 前言
Dart中只有BigInt没有BigDecimal#xff0c;所以需要手动去实现BigDecimal。 如果我的代码帮到你#xff0c;请给我点个赞。
API
构造函数
BigDecimal([dynamic number]) 将任意toSt… 目录 前言API构造函数四则及幂运算其他 代码BigDecimal.dartbigdecimal_test.dart 前言
Dart中只有BigInt没有BigDecimal所以需要手动去实现BigDecimal。 如果我的代码帮到你请给我点个赞。
API
构造函数
BigDecimal([dynamic number]) 将任意toString后能表示为小数的类型转换为BigDecimalBigDecimal.fromReal(List real) 将BigDecimal实数部分转换为BigDecimalBigDecimal.fromDecimal(List decimal) 将BigDecimal小数部分转换为BigDecimal
四则及幂运算
BigDecimal operator (dynamic number)BigDecimal operator - (dynamic number)BigDecimal operator * (dynamic number)BigDecimal operator / (dynamic number)BigDecimal pow(int n) 快速幂运算
其他
BigDecimal disablePrecisionLimit() 取消除法运算精度可能导致程序无限循环进行除法运算BigDecimal setDivMaxPrecision(int precision) 设置除法运算最大的精度默认1000BigDecimal clone() 克隆BigDecimal对象BigDecimal abs() 取正List real() 获取实数部分List decimal() 获取小数部分
代码
BigDecimal.dart
import dart:math as Math;//TODO StringBuilder自己想办法解决
import package:module_utils/tools/StringBuilder.dart;///高精度大数
///
/// eg: [123][1][2][3].[123][1][123] 123 000000001 000000002 000000003.000000123 000000001 000000123
class BigDecimal{static get nan BigDecimal(nan);static get zero BigDecimal(0.0);static get one BigDecimal(1.0);static get two BigDecimal(2.0);//实数部分 非空 [高位,低位] 值∈[0, 1E9-1]final Listint _real [];//小数部分 非空 [高位,低位] 值∈[0, 1E9-1]final Listint _decimal [];//正负号 true: false:-bool _sign true;//无穷大 除数为0时商为无穷大bool _nan false;//sqrt(int.max 9223372036854775807) 3037000499//每个list元素最大的值 1E10 - 1static const int _MaxUnit 999999999;static const int _1E9 1000000000;static BigDecimal min(BigDecimal b1, BigDecimal b2){return b1b2 ? b1 : b2;}static BigDecimal max(BigDecimal b1, BigDecimal b2){return b1b2 ? b2 : b1;}static int _lengthOfNormal([int num]) 9;//求实数最高元素的位数长度 eg: 123456 6static int _lengthOfReal(int num){return _splitReal(num).length;}//求小数最低元素的位数长度 eg: 1234560 00123456 8static int _lengthOfDecimal(int num){return _splitDecimal(num).length;}//将整数拆分 eg: 123456 [0,0,0,1,2,3,4,5,6]static Listint _splitNormal(int num){return List.filled(9, 1).asMap().keys.map((e) num~/Math.pow(10,e)%10).toList().reversed.toList();}//将实数高位元素拆分 eg: 123456 [1,2,3,4,5,6]static Listint _splitReal(int num){return List.filled(9, 1).asMap().keys.map((e) num~/Math.pow(10,e)%10).toList().reversed.skipWhile((value) value0).toList();}//将小数低位元素拆分 eg: 123456000 [1,2,3,4,5,6] err:0000100000static Listint _splitDecimal(int num){return num 0 ? [0] :List.filled(9, 1).asMap().keys.map((e) num~/Math.pow(10,e)%10).toList().skipWhile((value) value0).toList().reversed.toList();}//将整数数组拆分 eg: [123,456,789] [0,0,0,0,0,0,1,2,3,0,0,0,0,0,0,4,5,6,0,0,0,0,0,0,7,8,9]static Listint __splitNormal(Listint numbers){return numbers.map((e) _splitNormal(e)).expand((e) e).toList();}//将实数元素数组拆分 eg: [123,456,7890] [1,2,3,0,0,0,0,0,0,4,5,6,0,0,0,0,0,7,8,9,0]static Listint __splitReal(Listint numbers){return __splitNormal(numbers).skipWhile((value) value0).toList();}//将小数元素数组拆分 eg: [123,456,7890] [0,0,0,0,0,0,1,2,3,0,0,0,0,0,0,4,5,6,0,0,0,0,0,7,8,9]static Listint __splitDecimal(Listint numbers){var result __splitNormal(numbers);for(int iresult.length-1; i0; --i){if(result[i] 0) result.removeLast();else break;}return result;}//将按位分割的整数数组组合成一个整数 eg: [1,2,3,4,5,6] 123456static int _combineNormal(Listint numbers){return int.parse(numbers.join());}//将按位分割的整数数组组合成一个实数高位元素 eg: [0,1,2,3,4,5,6] 123456static int _combineReal(Listint numbers){return int.parse(numbers.skipWhile((e) e0).join().padLeft(1,0));}//将按位分割的整数数组组合成一个小数低位元素 eg: [1,2,3,4,5,6] 123456000static int _combineDecimal(Listint numbers){return numbers.length1numbers[0]0 ? 0 : int.parse(numbers.join().padRight(9,0));}//将按位分割的整数数组组组合成大数实数元素数组 eg: [1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7] [12345678,901234567]static Listint __combineReal(Listint numbers){Listint nums numbers.skipWhile((e) e0).toList();return List.filled(nums.length~/10 (nums.length%100?0:1), 0).asMap().keys.map((e) _combineReal(nums.sublist(Math.max(0,nums.length-(10*(e1))), nums.length-(10*e)))).toList();}//将按位分割的整数数组组组合成大数小数元素数组 eg: [1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7] [123456789,12345670]static Listint __combineDecimal(Listint numbers){var nums []..addAll(numbers);while(nums.length%10 ! 0) nums.add(0);return List.filled(nums.length~/10 (nums.length%100?0:1), 0).asMap().keys.map((e) e(nums.length~/10-1)? _combineDecimal(nums.sublist(10*e, Math.min(10*(e1), nums.length))): _combineReal (nums.sublist(10*e, 10*(e1)))).toList();}static Listint _parseReal(String part){Listint result [];while(part.length0){int length part.length;int index Math.max(length-9, 0);int num int.parse(part.substring(index, part.length));part part.substring(0, index);result.insert(0,num);}if(result.isEmpty) result.add(0);return result;}static Listint _parseDecimal(String part){Listint result [];while(part.length0){int length part.length;int index Math.min(length, 9);int num int.parse(part.substring(0,index).padRight(9,0));part part.substring(index);result.add(num);}if(result.isEmpty) result.add(0);return result;}BigDecimal.fromReal(Listint real){_real .addAll(real);_decimal.add(0);}BigDecimal.fromDecimal(Listint decimal){_real .add(0);_decimal.addAll(decimal);}BigDecimal([dynamic number]){try{if(number null) return;if(number is BigDecimal){_real.addAll(number._real);_decimal.addAll(number._decimal);_sign number._sign;_nan number._nan;return;}if(number is double){if(number.isNaN){_nan true;return;}BigDecimal decimal BigDecimal(number.toString());_real.addAll(decimal._real);_decimal.addAll(decimal._decimal);_sign decimal._sign;_nan decimal._nan;return;}if(number is int) {_sign number-1;_real.add(number.abs());_nan number.isNaN;return;}String strNumber number.toString().trim();if(strNumber.toLowerCase() nan){_sign true;_nan true;return;}_nan false;String num ;//判断正负号for(int i0,nistrNumber.length; ini; i){if(strNumber.codeUnitAt(i)-.codeUnitAt(0)){_sign false;break;}if(strNumber.codeUnitAt(i)..codeUnitAt(0)){_sign true;break;}if(strNumber.codeUnitAt(i)0.codeUnitAt(0) strNumber.codeUnitAt(i)9.codeUnitAt(0)){_sign true;break;}}//格式化for(int i0,nistrNumber.length; ini; i){if(strNumber.codeUnitAt(i)0.codeUnitAt(0) strNumber.codeUnitAt(i)9.codeUnitAt(0)){num strNumber.substring(i,i1);}if(strNumber.codeUnitAt(i)..codeUnitAt(0) num.indexOf(.)0){num strNumber.substring(i,i1);}}if(num.length 0) num 0.0;else if(num.indexOf(.)0) num num.0;int index num.indexOf(.);String strR num.substring(0, index);String strD num.substring(index1);_real .addAll(_parseReal (strR));_decimal.addAll(_parseDecimal(strD));}finally{if(_real .isEmpty) _real .add(0);if(_decimal.isEmpty) _decimal.add(0);}}int compare(BigDecimal another){if(_nan !another._nan) return 1;if(!_nan another._nan) return -1;if(_sign !another._sign) return 1;if(!_sign another._sign) return -1;bool sign _sign;//判断实数部分if(_real.length another._real.length) return sign ? 1 : -1;if(_real.length another._real.length) return sign ? -1 : 1;for(int i0,ni_real.length; ini; i){if(_real[i]another._real[i]) return sign ? 1 : -1;if(_real[i]another._real[i]) return sign ? -1 : 1;}//以下实数部分相等//判断小数部分//判断高位for(int i0, niMath.min(_decimal.length, another._decimal.length)-1; ini;i){if(_decimal[i]another._decimal[i]) return sign ? 1 : -1;if(_decimal[i]another._decimal[i]) return sign ? -1 : 1;}//将整数各个位分割以便判断低位int index Math.min(_decimal.length, another._decimal.length)-1;Listint num1 List.filled(10, 1).asMap().keys.map((e) _decimal[index]~/Math.pow(10,e)%10).toList().reversed.toList();Listint num2 List.filled(10, 1).asMap().keys.map((e) another._decimal[index]~/Math.pow(10,e)%10).toList().reversed.toList();for(int i0,niMath.min(num1.length, num2.length); ini;i){if(num1[i]num2[i]) return sign ? 1 : -1;if(num1[i]num2[i]) return sign ? -1 : 1;}if(num1.lengthnum2.length) return sign ? 1 : -1;if(num2.lengthnum2.length) return sign ? -1 : 1;if(_decimal.length another._decimal.length) return sign ? 1 : -1;if(_decimal.length another._decimal.length) return sign ? -1 : 1;return 0;}bool operator (dynamic number) this.compare(BigDecimal(number)) -1;bool operator (dynamic number) this.compare(BigDecimal(number)) 1;bool operator (dynamic number) this.compare(BigDecimal(number)) 0;BigDecimal operator (dynamic number){BigDecimal another BigDecimal(number);if(_nan | another._nan) return nan;//符号不一致if(_sign ^ another._sign){//当做减法处理if(_sign) return this - another.abs();return another - abs();}//符号一致处理//region 小数部分Listint dec1 _decimal;Listint dec2 another._decimal;int decLen1 dec1.length;int decLen2 dec2.length;// 计算小数公共元素的长度int decCommonLen Math.min(decLen1, decLen2);// 小数计算结果存放Listint decSum []..addAll(dec1.sublist(decCommonLen))..addAll(dec2.sublist(decCommonLen));// 进位标记bool carry false;// 小数公共元素数组求和for(int idecCommonLen-1; i-1; --i){int sum dec1[i] dec2[i] (carry?1:0);carry sum _1E9;if(carry) sum sum%_1E9;decSum.insert(0, sum);}// 小数格式化for(int idecSum.length-1; i0; --i){if(decSum[i]0) decSum.removeLast();else break;}//endregion//region 实数部分Listint real1 _real;Listint real2 another._real;int realLen1 real1.length;int realLen2 real2.length;Listint realSum [];// 公共部分求和for(int irealLen1-1, jrealLen2-1; j-1||i-1; --i,--j){int sum (i0?0:real1[i]) (j0?0:real2[j]) (carry?1:0);carry sum _1E9;if(carry) sum sum%_1E9;realSum.insert(0, sum);}if(carry) realSum.insert(0, 1);//endregionreturn BigDecimal().._nan false.._sign _sign.._real.clear().._real.addAll(realSum).._decimal.clear().._decimal.addAll(decSum);}BigDecimal operator - (dynamic number){BigDecimal another BigDecimal(number);if(_nan | another._nan) return nan;//符号不一致if(_sign ^ another._sign){//当做加法处理if(_sign) return this another.abs();return (abs() another.abs()).._sign false;}//符号一致且都是正数if(_sign){//减不过就换位减if(this another){return (another - this).._sign false;}}//符号一致且都是负数else{//-a - -b b - areturn another.abs() - abs();}bool borrow false;//region 小数部分Listint dec1 _decimal;Listint dec2 another._decimal;int decLen1 dec1.length;int decLen2 dec2.length;Listint decSub [];// 求差for(int iMath.max(decLen1,decLen2)-1; i-1; --i){int num1 i decLen1 ? dec1[i] : 0;int num2 i decLen2 ? dec2[i] : 0;int sub num1 - num2 - (borrow?1:0);borrow sub0;if(borrow) sub _1E9;decSub.insert(0, sub);}// 小数格式化for(int idecSub.length-1; i0; --i){if(decSub[i]0) decSub.removeLast();else break;}//endregion//region 实数部分Listint real1 _real;Listint real2 another._real;int realLen1 real1.length;int realLen2 real2.length;Listint realSub [];// 求差for(int idx1realLen1-1, idx2realLen2-1, iMath.max(realLen1, realLen2); i0; --i,--idx1,--idx2){int sub (idx10?0:real1[idx1]) - (idx20?0:real2[idx2]) - (borrow?1:0);borrow sub0;if(borrow) sub _1E9;realSub.insert(0, sub);}// 实数格式化for(int i0, nirealSub.length-1; ini; i){if(realSub[0]0) realSub.removeAt(0);else break;}//endregionreturn BigDecimal().._nan false.._sign !borrow.._real.clear().._real.addAll(realSub).._decimal.clear().._decimal.addAll(decSub);}BigDecimal operator * (dynamic number){BigDecimal another BigDecimal(number);if(_nan | another._nan) return nan;if(this zero || another zero) return zero;if(this one) return another;if(another one) return this.clone();//将两个数拆分成位数组Listint dec1 _decimal;Listint dec2 another._decimal;int decLen1 dec1.length;int decLen2 dec2.length;int decMulLen decLen1 decLen2;Listint real1 _real;Listint real2 another._real;Listint num1 []..addAll(real1)..addAll(dec1);Listint num2 []..addAll(real2)..addAll(dec2);int numLen1 num1.length;int numLen2 num2.length;int numMulLen numLen1 numLen2;//可能的最大长度//计算结果Listint numMul List.filled(numMulLen1, 0);Function(int, int) add (int index, int number){numMul[index] number;int carry numMul[index]~/_1E9;while(carry0){numMul[index] % _1E9;numMul[--index] carry;carry numMul[index]~/_1E9;}};for(int inumLen2-1, idx20, idx3numMulLen; i-1; --i,idx2,idx3numMulLen-idx2){for(int jnumLen1-1, idx1numMulLen-1-idx2; j-1; --j,--idx1,--idx3){int mul num2[i]*num1[j];add(idx3, mul);}}Listint real numMul.sublist(0 , numMul.length - decMulLen);Listint decimal numMul.sublist(numMul.length - decMulLen);while(real.length1){if(real[0]0) real.removeAt(0);else break;}// 小数格式化for(int idecimal.length-1; i0; --i){if(decimal[i]0) decimal.removeLast();else break;}return BigDecimal().._sign !(_sign ^ another._sign).._nan false.._real.clear().._real.addAll(real).._decimal.clear().._decimal.addAll(decimal);}BigDecimal operator / (dynamic number){BigDecimal another BigDecimal(number);if(_nan | another._nan) return nan;if(this zero) return zero;if(another zero) return nan;//将两个数拆分成元素数组Listint dec1 _decimal;Listint dec2 another._decimal;Listint real1 _real;Listint real2 another._real;Listint num1 []..addAll(real1)..addAll(dec1);Listint num2 []..addAll(real2)..addAll(dec2);//初始化除数的倍数final Mapint, BigDecimal mTimes {0:BigDecimal.zero, 1:BigDecimal.fromReal(num2)};Function(BigDecimal, BigDecimal) add (num1,num2) BigDecimal.fromReal((num1num2)._real);Function(int) timesOfDivisor;timesOfDivisor (time){BigDecimal value mTimes[time];if(value ! null) return value;value add(timesOfDivisor(time~/2 (time%20?0:1)), timesOfDivisor(time~/2));mTimes[time] value;return value;};//region 二分减法//b1~/b2 [quotient, remainder]Function(BigDecimal, BigDecimal) binSub (BigDecimal b1, BigDecimal b2){//平均计算 log2(10)≈3 log2(1E9)≈30// 0 9 5// 0 4 2 6 9 7//0 2 1 3 4 3 6 7 6 8 9 8// 0 1 2 3 4 5 6 7 8 9int l 0, r _MaxUnit;while(lr){int m (lr)~/2;BigDecimal b3 timesOfDivisor(m);int comp b1.compare(b3);if(comp 0) return [m,[0]];//b1 b3 m可能是结果if(comp 1){if(l1 r){BigDecimal b4 timesOfDivisor(r);comp b1.compare(b4);if(comp 0) return [r,[0]];if(comp 1) return [r,(b1-b4)._real];return [l,(b1-b3)._real];}l m;continue;}//b1 b3 m一定不是结果if(l1 r) return [m,(b1-b3)._real];r m - 1;}//一定不会执行此语句return [l,(b1-timesOfDivisor(l))._real];};//endregion//求商Listint numDiv [];int nRealPrecision real1.lengthdec2.length;int pPrecision -nRealPrecision;Listint dividend [];Listint divisor num2;BigDecimal bdDivisor BigDecimal.fromReal(num2);int divMaxBitPrecision _divMaxPrecision0?-1:_divMaxPrecision~/9 (_divMaxPrecision%90?0:1);for(int i0; inum1.length||dividend.isNotEmpty; i){if(divMaxBitPrecision-1){if(pPrecisiondivMaxBitPrecision) break;}// print(#${i.toString().padLeft(4,0)}: [${dividend.length}]:$dividend);pPrecision;int num inum1.length?num1[i]:0;if(num!0 || dividend.isNotEmpty) dividend.add(num);//不够减if(dividend.lengthdivisor.length) {numDiv.add(0);continue;}BigDecimal bdDividend BigDecimal.fromReal(dividend);List result binSub(bdDividend, bdDivisor);int quotient result[0];Listint remainder result[1];numDiv.add(quotient);if(quotient 0) continue;dividend.clear();dividend.addAll(remainder.skipWhile((e) e0).toList());}Listint divReal numDiv.sublist(0 , nRealPrecision).skipWhile((e) e0).toList();Listint divDecimal numDiv.sublist(nRealPrecision);if(divReal .isEmpty) divReal .add(0);if(divDecimal.isEmpty) divDecimal.add(0);//精度对齐if(_divMaxPrecision-1_divMaxPrecision%9!0){int last divDecimal.last;int len _divMaxPrecision%9;Listint llast _splitDecimal(last);llast llast.sublist(0, Math.min(llast.length, len));divDecimal.removeLast();divDecimal.add(_combineDecimal(llast));}for(int idivDecimal.length-1; i0; --i){if(divDecimal[i]0) divDecimal.removeLast();else break;}return BigDecimal().._sign !(_sign ^ another._sign).._nan false.._real.clear().._real.addAll(divReal).._decimal.clear().._decimal.addAll(divDecimal);}//为了防止计算除法时出现无限小数设置此位防止死循环//负数代表不限制int _divMaxPrecision 1000;BigDecimal setDivMaxPrecision(int precision){_divMaxPrecision precision;return this;}BigDecimal disablePrecisionLimit(){_divMaxPrecision -1;return this;}Listint real () __splitReal (_real );Listint decimal() __splitDecimal(_decimal);BigDecimal _powInternal(int n, Mapint,BigDecimal mPow){BigDecimal bd mPow[n];if(bd!null) return bd;int p1 n~/2;int p2 p1 (n%20?0:1);BigDecimal bdPow _powInternal(p1, mPow)*_powInternal(p2, mPow);mPow[n] bdPow;return bdPow.clone();}BigDecimal pow(int n){return _powInternal(n, {0:BigDecimal.one,1:clone()});}BigDecimal clone() BigDecimal().._nan false.._sign _sign.._real.clear().._real.addAll(_real).._decimal.clear().._decimal.addAll(_decimal);BigDecimal abs(){return BigDecimal().._sign true.._nan _nan.._real.clear().._real.addAll(_real).._decimal.clear().._decimal.addAll(_decimal);}overrideString toString(){if(_nan) return nan;StringBuilder sb StringBuilder();if(!_sign) sb.append(-);sb.append(_real[0].toString());for(int i1,ni_real.length;ini;i){sb.append(_real[i].toString().padLeft(9,0));}sb.append(.);if(_decimal.length1) {for(int i0,ni_decimal.length-1;ini;i){sb.append(_decimal[i].toString().padLeft(9,0));}}sb.append(_splitDecimal(_decimal[_decimal.length-1]).join());return sb.toString();}overrideint get hashCode _real.hashCode * _decimal.hashCode;
}bigdecimal_test.dart
import dart:math;import package:flutter_test/flutter_test.dart;import BigDecimal.dart;
import StringBuilder.dart;//region randomGenerate
Random random Random(DateTime.now().millisecondsSinceEpoch);
String generateNumber({bool decimalfalse, int length0, int maxLength10000}){while(length0) length random.nextInt(maxLength1);StringBuilder sb StringBuilder();while(sb.length() length){int num random.nextInt(min(0x7fffffff,pow(10,min(10,length-sb.length()))));sb.append(num.toString());}if(decimal){if(sb.charAt(sb.length()-1) 0.codeUnitAt(0)){int num random.nextInt(10);while(num0) num random.nextInt(10);sb.replace(sb.length()-1, sb.length(), num.toString());}}else{if(sb.charAt(0) 0.codeUnitAt(0)){int num random.nextInt(10);while(num0) num random.nextInt(10);sb.replace(0, 1, num.toString());}}return sb.toString();
}
//endregionvoid main(){test(BigDecimal constructor test, ()async{//验证nanprint(Testing NAN);expect(BigDecimal(nan).toString()nan , isTrue);//验证1,1E10,1E100,1E1000,1E10000print(Testing Positive);expect(BigDecimal(1.padRight(pow(10, 0)1,0)).toString(), 1.padRight(pow(10, 0)1,0).0);expect(BigDecimal(1.padRight(pow(10, 1)1,0)).toString(), 1.padRight(pow(10, 1)1,0).0);expect(BigDecimal(1.padRight(pow(10, 2)1,0)).toString(), 1.padRight(pow(10, 2)1,0).0);expect(BigDecimal(1.padRight(pow(10, 3)1,0)).toString(), 1.padRight(pow(10, 3)1,0).0);expect(BigDecimal(1.padRight(pow(10, 4)1,0)).toString(), 1.padRight(pow(10, 4)1,0).0);//验证1E-1,1E-10,1E-100,1E-1000,1E-10000print(Testing Negative);expect(BigDecimal(0.${1.padLeft(pow(10, 0),0)}).toString(), 0.${1.padLeft(pow(10, 0),0)});expect(BigDecimal(0.${1.padLeft(pow(10, 1),0)}).toString(), 0.${1.padLeft(pow(10, 1),0)});expect(BigDecimal(0.${1.padLeft(pow(10, 2),0)}).toString(), 0.${1.padLeft(pow(10, 2),0)});expect(BigDecimal(0.${1.padLeft(pow(10, 3),0)}).toString(), 0.${1.padLeft(pow(10, 3),0)});expect(BigDecimal(0.${1.padLeft(pow(10, 4),0)}).toString(), 0.${1.padLeft(pow(10, 4),0)});//随机测验实数和小数长度[1,10000]print(Testing Random);for(int i0;i10000;i){bool sign random.nextBool();String real generateNumber(decimal: false);String decimal generateNumber(decimal: true );String number ${sign?:-}$real.$decimal;print(\tEvaluating #${i.toString().padLeft(4)} ${sign? :-}[${real.length.toString().padLeft(5)}].[${decimal.length.toString().padLeft(5)}]:$number);expect(BigDecimal(number).toString(), number, reason: Compare error $i: ${sign? :}$number);}print(Test passed!!!);},timeout: Timeout(Duration(minutes: 1)));test(BigDecimal compare test, ()async{expect(BigDecimal(-1).compare(BigDecimal(1 )), -1);expect(BigDecimal(1 ).compare(BigDecimal(-1)), 1);expect(BigDecimal(1 ).compare(BigDecimal(1 )), 0);//Test 99...9 10....0expect(BigDecimal(9.padLeft (10 ,9)).compare(BigDecimal(1.padRight(11 ,0))), -1);expect(BigDecimal(1.padRight(11 ,0)).compare(BigDecimal(9.padLeft (10 ,9))), 1);expect(BigDecimal(9.padLeft (100 ,9)).compare(BigDecimal(1.padRight(101 ,0))), -1);expect(BigDecimal(1.padRight(101 ,0)).compare(BigDecimal(9.padLeft (100 ,9))), 1);expect(BigDecimal(9.padLeft (1000 ,9)).compare(BigDecimal(1.padRight(1001 ,0))), -1);expect(BigDecimal(1.padRight(1001 ,0)).compare(BigDecimal(9.padLeft (1000 ,9))), 1);expect(BigDecimal(9.padLeft (10000,9)).compare(BigDecimal(1.padRight(10001,0))), -1);expect(BigDecimal(1.padRight(10001,0)).compare(BigDecimal(9.padLeft (10000,9))), 1);//Test -99...9 -10....0expect(BigDecimal(-${9.padLeft (10 ,9)}).compare(BigDecimal(-${1.padRight(11 ,0)})), 1);expect(BigDecimal(-${1.padRight(11 ,0)}).compare(BigDecimal(-${9.padLeft (10 ,9)})), -1);expect(BigDecimal(-${9.padLeft (100 ,9)}).compare(BigDecimal(-${1.padRight(101 ,0)})), 1);expect(BigDecimal(-${1.padRight(101 ,0)}).compare(BigDecimal(-${9.padLeft (100 ,9)})), -1);expect(BigDecimal(-${9.padLeft (1000 ,9)}).compare(BigDecimal(-${1.padRight(1001 ,0)})), 1);expect(BigDecimal(-${1.padRight(1001 ,0)}).compare(BigDecimal(-${9.padLeft (1000 ,9)})), -1);expect(BigDecimal(-${9.padLeft (10000,9)}).compare(BigDecimal(-${1.padRight(10001,0)})), 1);expect(BigDecimal(-${1.padRight(10001,0)}).compare(BigDecimal(-${9.padLeft (10000,9)})), -1);//Test randomfor(int i0; i10000; i){bool sign1 random.nextBool();String strReal1 generateNumber(decimal: false);String strDecimal1 generateNumber(decimal: true );String number1 ${sign1?:-}$strReal1.$strDecimal1;bool sign2 random.nextBool();String strReal2 generateNumber(decimal: false);String strDecimal2 generateNumber(decimal: true );String number2 ${sign2?:-}$strReal2.$strDecimal2;int compare;if( sign1 !sign2) compare 1;if(!sign1 sign2) compare -1;if(sign1 sign2){bool sign sign1;if (strReal1.lengthstrReal2.length) compare 1;else if(strReal1.lengthstrReal2.length) compare -1;else compare strReal1.compareTo(strReal2);if(compare0){String strDecimal3 strDecimal1.padRight(max(strDecimal1.length, strDecimal2.length),0);String strDecimal4 strDecimal2.padRight(max(strDecimal1.length, strDecimal2.length),0);compare strDecimal3.compareTo(strDecimal4);}if(compare!0){compare sign ? compare : -compare;}}expect(BigDecimal(number1).compare(BigDecimal(number2)), compare);}});test(BigDecimal operator test, ()async{print(Testing Basic);expect((BigDecimal(1 )BigDecimal(1 )).toString(), BigDecimal(2 ).toString());expect((BigDecimal(-1)BigDecimal(1 )).toString(), BigDecimal.zero .toString());expect((BigDecimal(-1)BigDecimal(-1)).toString(), BigDecimal(-2).toString());print(Testing Real);expect((BigDecimal(9.padLeft (10 ,9))BigDecimal.one).toString(), BigDecimal(1.padRight(11 ,0)).toString());expect((BigDecimal(9.padLeft (100 ,9))BigDecimal.one).toString(), BigDecimal(1.padRight(101 ,0)).toString());expect((BigDecimal(9.padLeft (1000 ,9))BigDecimal.one).toString(), BigDecimal(1.padRight(1001 ,0)).toString());expect((BigDecimal(9.padLeft (10000,9))BigDecimal.one).toString(), BigDecimal(1.padRight(10001,0)).toString());print(Testing Decimal);expect((BigDecimal(0.${1.padLeft(pow(10, 0),0)})BigDecimal(0.${9.padLeft(pow(10, 0),9)})).toString(), BigDecimal.one.toString());expect((BigDecimal(0.${1.padLeft(pow(10, 1),0)})BigDecimal(0.${9.padLeft(pow(10, 1),9)})).toString(), BigDecimal.one.toString());expect((BigDecimal(0.${1.padLeft(pow(10, 2),0)})BigDecimal(0.${9.padLeft(pow(10, 2),9)})).toString(), BigDecimal.one.toString());expect((BigDecimal(0.${1.padLeft(pow(10, 3),0)})BigDecimal(0.${9.padLeft(pow(10, 3),9)})).toString(), BigDecimal.one.toString());expect((BigDecimal(0.${1.padLeft(pow(10, 4),0)})BigDecimal(0.${9.padLeft(pow(10, 4),9)})).toString(), BigDecimal.one.toString());print(Testing random);for(int i0; i10000; i) {print(\tEvaluating #${i.toString().padLeft(4)} -);String strReal1 generateNumber(decimal: false);String strDecimal1 generateNumber(decimal: true);String number1 $strReal1.$strDecimal1;String strReal2 generateNumber(decimal: false);String strDecimal2 generateNumber(decimal: true);String number2 $strReal2.$strDecimal2;print(\t\t[${strReal1.length.toString().padLeft(5)}].[${strDecimal1.length.toString().padLeft(5)}]:${strReal1.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal1);print(\t\t[${strReal2.length.toString().padLeft(5)}].[${strDecimal2.length.toString().padLeft(5)}]:${strReal2.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal2);BigInt biReal1 BigInt.parse(strReal1 );BigInt biDecimal1 BigInt.parse(strDecimal1.padRight(max(strDecimal1.length, strDecimal2.length),0));BigInt biReal2 BigInt.parse(strReal2 );BigInt biDecimal2 BigInt.parse(strDecimal2.padRight(max(strDecimal1.length, strDecimal2.length),0));BigInt biDecimal3 biDecimal1 biDecimal2;String strDecimal3 biDecimal3.toString();bool carry max(strDecimal1.length, strDecimal2.length) ! strDecimal3.length;BigInt biReal3 biReal1 biReal2 (carry?BigInt.one : BigInt.zero);String strReal3 biReal3.toString();if(carry) strDecimal3 strDecimal3.substring(1);expect(BigDecimal(number1)BigDecimal(number2), BigDecimal($strReal3.$strDecimal3));}});test(BigDecimal operator - test,()async{print(Testing Basic);expect((BigDecimal(1 )-BigDecimal(1 )).toString(), BigDecimal.zero .toString());expect((BigDecimal(2 )-BigDecimal(1 )).toString(), BigDecimal.one .toString());expect((BigDecimal.zero -BigDecimal(1 )).toString(), BigDecimal(-1).toString());print(Testing Real);expect((BigDecimal(1.padRight(11 ,0))-BigDecimal.one).toString(), BigDecimal(9.padLeft (10 ,9)).toString());expect((BigDecimal(1.padRight(101 ,0))-BigDecimal.one).toString(), BigDecimal(9.padLeft (100 ,9)).toString());expect((BigDecimal(1.padRight(1001 ,0))-BigDecimal.one).toString(), BigDecimal(9.padLeft (1000 ,9)).toString());expect((BigDecimal(1.padRight(10001,0))-BigDecimal.one).toString(), BigDecimal(9.padLeft (10000,9)).toString());print(Testing Decimal);expect((BigDecimal.one-BigDecimal(0.${1.padLeft(pow(10, 0),0)})).toString(), BigDecimal(0.${9.padLeft(pow(10, 0),9)}).toString());expect((BigDecimal.one-BigDecimal(0.${1.padLeft(pow(10, 1),0)})).toString(), BigDecimal(0.${9.padLeft(pow(10, 1),9)}).toString());expect((BigDecimal.one-BigDecimal(0.${1.padLeft(pow(10, 2),0)})).toString(), BigDecimal(0.${9.padLeft(pow(10, 2),9)}).toString());expect((BigDecimal.one-BigDecimal(0.${1.padLeft(pow(10, 3),0)})).toString(), BigDecimal(0.${9.padLeft(pow(10, 3),9)}).toString());expect((BigDecimal.one-BigDecimal(0.${1.padLeft(pow(10, 4),0)})).toString(), BigDecimal(0.${9.padLeft(pow(10, 4),9)}).toString());print(Testing random);for(int i0; i1000; i) {print(\tEvaluating #${i.toString().padLeft(4)} -);String strReal1 generateNumber(decimal: false);String strDecimal1 generateNumber(decimal: true);String number1 $strReal1.$strDecimal1;String strReal2 generateNumber(decimal: false);String strDecimal2 generateNumber(decimal: true);String number2 $strReal2.$strDecimal2;print(\t\t[${strReal1.length.toString().padLeft(5)}].[${strDecimal1.length.toString().padLeft(5)}]:${strReal1.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal1);print(\t\t[${strReal2.length.toString().padLeft(5)}].[${strDecimal2.length.toString().padLeft(5)}]:${strReal2.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal2);BigInt biReal1 BigInt.parse(strReal1 );BigInt biDecimal1 BigInt.parse(strDecimal1.padRight(max(strDecimal1.length, strDecimal2.length),0));BigInt biReal2 BigInt.parse(strReal2 );BigInt biDecimal2 BigInt.parse(strDecimal2.padRight(max(strDecimal1.length, strDecimal2.length),0));int compare;if (strReal1.lengthstrReal2.length) compare 1;else if(strReal1.lengthstrReal2.length) compare -1;else compare strReal1.compareTo(strReal2);if(compare0){String strDecimal3 strDecimal1.padRight(max(strDecimal1.length, strDecimal2.length),0);String strDecimal4 strDecimal2.padRight(max(strDecimal1.length, strDecimal2.length),0);compare strDecimal3.compareTo(strDecimal4);}BigInt biDecimal3 BigInt.zero;String strReal3 ;String strDecimal3 ;if(compare1){biDecimal3 biDecimal1 - biDecimal2;bool borrow biDecimal3 BigInt.zero;BigInt biReal3 biReal1 - biReal2 - (borrow?BigInt.one : BigInt.zero);strReal3 biReal3.toString();if(borrow) strDecimal3 (biDecimal3 BigInt.parse(1.padRight(max(strDecimal1.length, strDecimal2.length)1,0))).toString();else strDecimal3 biDecimal3.toString();}if(compare-1){// a-b -(b-a)biDecimal3 biDecimal2 - biDecimal1;bool borrow biDecimal3 BigInt.zero;BigInt biReal3 biReal2 - biReal1 - (borrow?BigInt.one : BigInt.zero);strReal3 -biReal3.toString();if(borrow) strDecimal3 (biDecimal3 BigInt.parse(1.padRight(max(strDecimal1.length, strDecimal2.length)1,0))).toString();else strDecimal3 biDecimal3.toString();}if(strDecimal3 ! 0){strDecimal3 strDecimal3.padLeft(max(strDecimal1.length, strDecimal2.length),0);while(strDecimal3.length0){if(strDecimal3.substring(strDecimal3.length-1) 0){strDecimal3 strDecimal3.substring(0, strDecimal3.length-1);continue;}break;}}expect(BigDecimal(number1)-BigDecimal(number2), BigDecimal($strReal3.$strDecimal3));}});test(BigDecimal operator * test,()async{print(Testing Basic);expect((BigDecimal(1 )*BigDecimal(1 )).toString(), BigDecimal(1 ).toString());expect((BigDecimal(-1)*BigDecimal(1 )).toString(), BigDecimal(-1).toString());expect((BigDecimal(-1)*BigDecimal(-1)).toString(), BigDecimal(1 ).toString());print(Testing Real);expect((BigDecimal(9.padLeft (10 ,9))*BigDecimal.one).toString(), BigDecimal(9.padLeft (10 ,9)).toString());expect((BigDecimal(9.padLeft (100 ,9))*BigDecimal.one).toString(), BigDecimal(9.padLeft (100 ,9)).toString());expect((BigDecimal(9.padLeft (1000 ,9))*BigDecimal.one).toString(), BigDecimal(9.padLeft (1000 ,9)).toString());expect((BigDecimal(9.padLeft (10000,9))*BigDecimal.one).toString(), BigDecimal(9.padLeft (10000,9)).toString());print(Testing Decimal);expect((BigDecimal(0.${9.padLeft(pow(10, 0),9)})*BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 0),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 1),9)})*BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 1),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 2),9)})*BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 2),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 3),9)})*BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 3),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 4),9)})*BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 4),9)}).toString());print(Testing random);for(int i0; i10000; i) {print(\tEvaluating #${i.toString().padLeft(4)} -);String strReal1 generateNumber(decimal: false);String strDecimal1 generateNumber(decimal: true);String number1 $strReal1.$strDecimal1;String strReal2 generateNumber(decimal: false);String strDecimal2 generateNumber(decimal: true);String number2 $strReal2.$strDecimal2;print(\t\t[${strReal1.length.toString().padLeft(5)}].[${strDecimal1.length.toString().padLeft(5)}]:${strReal1.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal1);print(\t\t[${strReal2.length.toString().padLeft(5)}].[${strDecimal2.length.toString().padLeft(5)}]:${strReal2.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal2);BigInt biNum1 BigInt.parse($strReal1${strDecimal1.padRight(max(strDecimal1.length, strDecimal2.length),0)});BigInt biNum2 BigInt.parse($strReal2${strDecimal2.padRight(max(strDecimal1.length, strDecimal2.length),0)});BigInt biPow BigInt.parse(1.padRight(max(strDecimal1.length,strDecimal2.length)*21,0));BigInt biNum3 biNum1 * biNum2;String strReal3 (biNum3~/biPow).toString();String strDecimal3 (biNum3%biPow).toString().padLeft(max(strDecimal1.length, strDecimal2.length)*2,0);while(strDecimal3.length0){if(strDecimal3.substring(strDecimal3.length-1) 0){strDecimal3 strDecimal3.substring(0, strDecimal3.length-1);continue;}break;}expect(BigDecimal(number1)*BigDecimal(number2), BigDecimal($strReal3.$strDecimal3));}print(Test Passed);});test(BigDecimal operator / test,()async{print(Testing Basic);expect((BigDecimal(1 ).disablePrecisionLimit()/BigDecimal(0.1 )).toString(), BigDecimal(10).toString());expect((BigDecimal(1 ).disablePrecisionLimit()/BigDecimal(1 )).toString(), BigDecimal(1 ).toString());expect((BigDecimal(-1).disablePrecisionLimit()/BigDecimal(1 )).toString(), BigDecimal(-1).toString());expect((BigDecimal(-1).disablePrecisionLimit()/BigDecimal(-1 )).toString(), BigDecimal(1 ).toString());print(Testing Real);expect((BigDecimal(9.padLeft (10 ,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (10 ,9)).toString());expect((BigDecimal(9.padLeft (100 ,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (100 ,9)).toString());expect((BigDecimal(9.padLeft (1000 ,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (1000 ,9)).toString());expect((BigDecimal(9.padLeft (10000,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (10000,9)).toString());print(Testing Decimal);expect((BigDecimal(0.${9.padLeft(pow(10, 0),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 0),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 1),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 1),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 2),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 2),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 3),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 3),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 4),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 4),9)}).toString());print(Testing random);for(int i0; i1000; i) {print(\tEvaluating #${i.toString().padLeft(4)} -);String strReal1 generateNumber(decimal: false, maxLength: 50);String strDecimal1 generateNumber(decimal: true , maxLength: 50);String number1 $strReal1.$strDecimal1;String strReal2 generateNumber(decimal: false, maxLength: 50);String strDecimal2 generateNumber(decimal: true , maxLength: 50);String number2 $strReal2.$strDecimal2;print(\t\t[${strReal1.length.toString().padLeft(5)}].[${strDecimal1.length.toString().padLeft(5)}]:${strReal1.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal1);print(\t\t[${strReal2.length.toString().padLeft(5)}].[${strDecimal2.length.toString().padLeft(5)}]:${strReal2.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal2);StringBuilder sbDiv StringBuilder();int nRealBitPrecision strReal1.length strDecimal2.length;int pPrecision -nRealBitPrecision;int char0 0.codeUnitAt(0);BigInt biTen BigInt.from(10);String strNum1 $strReal1$strDecimal1;BigInt dividend BigInt.zero;BigInt divisor BigInt.parse($strReal2$strDecimal2);for(int i0; istrNum1.length || dividend!BigInt.zero; i){if(pPrecision1000) break;int num istrNum1.length ? (strNum1.codeUnitAt(i)-char0) : 0;dividend dividend*biTen BigInt.from(num);if(dividenddivisor){sbDiv.append(0);continue;}BigInt quotient dividend~/divisor;BigInt remainder dividend%divisor;sbDiv.append(quotient.toString());dividend remainder;}String strReal3 sbDiv.substring(0 , nRealBitPrecision);String strDecimal3 sbDiv.substring(nRealBitPrecision);while(strReal3.length0){if(strReal3.substring(0,1) 0){strReal3 strReal3.substring(1);continue;}break;}while(strDecimal3.length0){if(strDecimal3.substring(strDecimal3.length-1) 0){strDecimal3 strDecimal3.substring(0, strDecimal3.length-1);continue;}break;}expect(BigDecimal(number1)/BigDecimal(number2), BigDecimal($strReal3.$strDecimal3));}print(Test Passed);});test(BigDecimal operator / test 2,()async{print(Testing Basic);expect((BigDecimal(1 ).disablePrecisionLimit()/BigDecimal(0.1 )).toString(), BigDecimal(10).toString());expect((BigDecimal(1 ).disablePrecisionLimit()/BigDecimal(1 )).toString(), BigDecimal(1 ).toString());expect((BigDecimal(-1).disablePrecisionLimit()/BigDecimal(1 )).toString(), BigDecimal(-1).toString());expect((BigDecimal(-1).disablePrecisionLimit()/BigDecimal(-1 )).toString(), BigDecimal(1 ).toString());print(Testing Real);expect((BigDecimal(9.padLeft (10 ,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (10 ,9)).toString());expect((BigDecimal(9.padLeft (100 ,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (100 ,9)).toString());expect((BigDecimal(9.padLeft (1000 ,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (1000 ,9)).toString());expect((BigDecimal(9.padLeft (10000,9)).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(9.padLeft (10000,9)).toString());print(Testing Decimal);expect((BigDecimal(0.${9.padLeft(pow(10, 0),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 0),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 1),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 1),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 2),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 2),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 3),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 3),9)}).toString());expect((BigDecimal(0.${9.padLeft(pow(10, 4),9)}).disablePrecisionLimit()/BigDecimal.one).toString(), BigDecimal(0.${9.padLeft(pow(10, 4),9)}).toString());print(Testing random);for(int i0; i10000; i) {print(\tEvaluating #${i.toString().padLeft(4)} -);String strReal1 generateNumber(decimal: false, maxLength: 50);String strDecimal1 generateNumber(decimal: true, maxLength: 50);String number1 $strReal1.$strDecimal1;String strReal2 generateNumber(decimal: false, maxLength: 50);String strDecimal2 generateNumber(decimal: true, maxLength: 50);String number2 $strReal2.$strDecimal2;print(\t\t[${strReal1.length.toString().padLeft(5)}].[${strDecimal1.length.toString().padLeft(5)}]:${strReal1.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal1);print(\t\t[${strReal2.length.toString().padLeft(5)}].[${strDecimal2.length.toString().padLeft(5)}]:${strReal2.padLeft(max(strReal1.length, strReal2.length), )}.$strDecimal2);BigDecimal bd1 BigDecimal(number1);BigDecimal bd2 BigDecimal(number2);BigDecimal bd3 bd1*bd2;expect(bd3.disablePrecisionLimit()/bd2, bd1);}print(Test Passed);},);
}
