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1.指针数组:由n个指向整型元素的指针而组成,里面存放指针 Int *ptr[3];
2.地址: ptr[i]:元素地址 ptr[i]:指针地址
图示
代码: 内存布局:
代码
#includestdio.h
#includestring.h
//指针数组--int
void pointer(int *arr,int len)
{int …基本介绍
1.指针数组:由n个指向整型元素的指针而组成,里面存放指针 Int *ptr[3];
2.地址: ptr[i]:元素地址 ptr[i]:指针地址
图示
代码: 内存布局:
代码
#includestdio.h
#includestring.h
//指针数组--int
void pointer(int *arr,int len)
{int i, *ptr[10];for(i0;ilen;i){ptr[i]arr[i];printf(arr[%d]%d address%p\n,i,arr[i],arr[i]);printf(ptr[%d]%d address%p self-address%p\n,i,*ptr[i],ptr[i],ptr[i]);}
}//指针数组--char
void cpointer(char* s,int len)
{char *c[4];int i0;printf(s%s address%p self-address%p\n,s,s,s);while(ilen){c[i]s[i];printf(c[%d]%c address%p self-address%p\n,i,*c[i],c[i],c[i]);i;}
}void cpointer2(char *s,int len)
{char *c[4];int i;printf(s%s address%p self-address%p\n,s,s,s);for(i0;ilen;i){c[i]s[i];}char *pc[0];for(i0;ilen;i){printf(c[%d]%c address%p self-address%p\n,i,*p,p,p);p;}
}
int main()
{int i,arr[10];int lensizeof(arr)/sizeof(int);char *suiop;for(i0;ilen;i){arr[i]99;}printf(int_pointer:\n);pointer(arr,len);printf(char_pointer:\n);cpointer(s,strlen(s));printf(char_pointer2:\n);cpointer2(s,strlen(s));getchar();return 0;
}输出:
int_pointer:
arr[0]99 address010FF984
ptr[0]99 address010FF984 self-address010FF854
arr[1]99 address010FF988
ptr[1]99 address010FF988 self-address010FF858
arr[2]99 address010FF98C
ptr[2]99 address010FF98C self-address010FF85C
arr[3]99 address010FF990
ptr[3]99 address010FF990 self-address010FF860
arr[4]99 address010FF994
ptr[4]99 address010FF994 self-address010FF864
arr[5]99 address010FF998
ptr[5]99 address010FF998 self-address010FF868
arr[6]99 address010FF99C
ptr[6]99 address010FF99C self-address010FF86C
arr[7]99 address010FF9A0
ptr[7]99 address010FF9A0 self-address010FF870
arr[8]99 address010FF9A4
ptr[8]99 address010FF9A4 self-address010FF874
arr[9]99 address010FF9A8
ptr[9]99 address010FF9A8 self-address010FF878
char_pointer:
suiop address006B5814 self-address010FF894
c[0]u address006B5814 self-address010FF878
c[1]i address006B5815 self-address010FF87C
c[2]o address006B5816 self-address010FF880
c[3]p address006B5817 self-address010FF884
char_pointer2:
suiop address006B5814 self-address010FF894
c[0]u address006B5814 self-address010FF860
c[1]i address006B5815 self-address010FF860
c[2]o address006B5816 self-address010FF860
c[3]p address006B5817 self-address010FF860
字符数组指针
具体分析
#includestdio.h
#includestring.h
int main()
{char *p[]{水浒传,三国演义,西游记,红楼梦};int i0;printf(方法1:\n);for(i0;i4;i){/*字符指针char *pstrgood dog ww;printf(字符指针指向的字符串内容:%s\n,pstr);所以这里的%s--p[i]数组:地址传递(指针)%c *pstr是取出一个字符这里不能*p[i],p[i]本身就是一个字符数组指针,无法单独取出一个字符*/
//p[0]水浒传 %s p[0]就直接是取出字符串printf(p[%d]%s address%p self-address%p\n,i,p[i],p[i],p[i]);}printf(方法2:\n);char *ptrp[0];i0;while(i3){printf(p%s address%p self-address%p\n,ptr,ptr,ptr);i;ptrp[i];//每一个p[i]的字符内容不同,导致其间隔不同,所以不能使用ptr}getchar();return 0;
}整型数组指针
#includestdio.h
#includestring.h
//整型指针
int main()
{int a1,b2,c4,d90;int*a1a,*a2b,*a3c,*a4d;int *arr[]{a1,a2,a3,a4};int i;printf(方法1:\n);for(i0;i4;i){//arr[0]a1a1的地址--%d arr[i]只会取到地址//*arr[i]才能取到值printf(arr[%d]%d address%p self-address%p\n,i,*arr[i],arr[i],arr[i]);}printf(方法2:\n);i0;int *parr[0];while(i3){printf(arr[%d]%d address%p self-address%p\n,i,*p,p,p);i;parr[i];//p不行 随机存储的,1不是下一个元素的地址}getchar();return 0;
}区分
指针数组: 由n个指向整型元素的指针而组成,里面存放指针 Int *ptr[3];
数组指针: 指向一个有n个元素的数组的指针,里面存放的是整型变量(int类型长度为n的数组的首地址),存的是一个数组地址,而不是单个元素 int(*p)[n] 代码详解
#includestdio.h
#includestdlib.h
#includestring.h
//指针使用 int(*p)[n]与int *p[n]的区别
int main()
{int i;// int(*p)[n]--指向一个有n个元素的数组的指针,里面存放的是整型变量(int类型长度为n的数组的首地址)//存的是一个数组地址,而不是单个元素int a[3]{1,2,3};int b[3][3]{{1,4,0},{2,5,6},{7,6,8}};int(*arr)[3]b;printf(int(*arr)[n]:\n);for(i0;i3;i){printf(arr[%d]%d address%p self-address%p\n,i,*arr[i],arr[i],arr[i]);}//int *p[n]--指针数组,由n个指向整型元素的指针而组成,里面存放指针int *p[3];for(i0;i3;i){p[i]a[i];}printf(int*p[n]:\n);for(i0;i3;i){//数组printf(arr[%d]%d address%p self-address%p\n,i,*p[i],p[i],p[i]);}getchar();return 0;
}
