加与变量同符号的0.5，再强制取整就可以了。如下面的举例代码：//#include "stdafx.h"//If the vc++6.0, with this line.#include "stdio.h"int main(void){ double x=3.1415926,y=1.507,z=0.499999; printf("%d %d %d\n",int(x+(x>0?.5:-.5)),int(y+(y>0?.5:-...