重庆交通建设集团网站,公众号修改wordpress,天猫建设网站的目的,医疗器械行业发展趋势和前景main.c :10:2 warning: no newline at the end of file 修复这个警告#xff0c;在文件结尾回车一下就行了。可以很少会有人去仔细探究#xff0c;为什么gcc会给出这么一个警告#xff1f; 原因其实也很简单#xff0c;因为标准规定如此。C99第5.1.1.2节这样写道#xff1…main.c :10:2 warning: no newline at the end of file 修复这个警告在文件结尾回车一下就行了。可以很少会有人去仔细探究为什么gcc会给出这么一个警告 原因其实也很简单因为标准规定如此。C99第5.1.1.2节这样写道 Each instance of a backslash character (/) immediately followed by a new-line character is deleted, splicing physical source lines to form logical source lines.Only the last backslash on any physical source lineshall be eligible for being part of such a splice. A source file that is not empty shall end in a new-line character, which shall not be immediately preceded by a backslash character before any such splicing takes place. C99 Rationale中进一步指出 A backslash immediately before a newline has long been used to continue string literals, as well as preprocessing command lines. In the interest of easing machine generation of C, and of transporting code to machines with restrictive physical line lengths, the C89 Committee generalized this mechanism to permit any token to be continued by interposing a backslash/newline sequence. 这么规定的初衷有两个 为了每一行都要以换行结束。 因为行尾的/表示连接下一行如果一个文件最后一行(main函数的右边大括号)行尾有/那么紧跟它也被包含进来的下一个源文件的第一行就会被连接而如果一个文件以一个空行结束就会避免这种情况的发生。 例子 [cpp] view plaincopy #include stdio.h int main() { printf(%d, / sizeof(int)); return 0; } 上例中的第四个物理行和第五个物理行被反斜杠(/)连接成一个逻辑行等价于printf(%d, sizeof(int));
如果在第七行main函数的右大括号后面加上反斜杠的话那么它就会和下一个文件的第一行连接所以这里}之后要输入一个换行符故要求每一行都要用换行结束。
注有些编译器会自动在文件结束位置插入换行符。譬如vi编辑器
