void main()
{
      long x, y;
      int a, b, c, d;
      x = 5;
      y = 6;
      a = 7;
      b = 8;
      c = x + a;
      d = y + b;
      printf("c=x+a=%d, d=y+b=%d\n", c, d);
}


F:\Microsoft Visual Studio\MyProjects\gg\over.cpp(11) : error C2065: 'printf' : undeclared identifier

# include<stdio.h>           ————————缺少头文件调用printf函数

void main()
 {
       long x, y;
       int a, b, c, d;
       x = 5;
       y = 6;
       a = 7;
       b = 8;
       c = x + a;
       d = y + b;
       printf("c=x+a=%d, d=y+b=%d\n", c, d);
 }

用int main()再把long换成long long。

头文件用include<iostream>
        using namespace std;

哦错了应该用include<cstdio>
后面加using namespace std;

求分

你这是c++里面用的吧，C语言不用