输出出错的文件和行号

#include <stdio.h>
#include <iostream>
#line 1 "a.cpp" // 修改宏__LINE__和 __FILE__ 也可以默认
int main(int argv, char * argc[])
{

    std::cout << "file =" << __FILE__ << "line =" << __LINE__ << std::endl;

    std::cout << "file =" << __FILE__ << "line =" << __LINE__ << std::endl;

    std::cout << "file =" << __FILE__ << "line =" << __LINE__ << std::endl;

    return 0;
}