代码如下#include "stdafx.h"
#include "stdio.h"
int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
     int  ret= MessageBox(NULL,"        你好吗？","提示",MB_YESNO|MB_ICONINFORMATION);
    if(ret=IDYES)
     MessageBox(NULL,"        哈哈！","提示",0);
    else     
    MessageBox(NULL,"        怎么了","提示",NULL);
    return 0;
}  


我找到错误原因了  if(ret==IDYES)等号我写成了赋值

为什么写成if(ret=IDYES)就不管你是点是还是否都只弹 MessageBox(NULL,"        哈哈！","提示",0);   而写成if(ret==IDYES)就正常了呢   这点我没想明白