你的程序有三个错误:
1.
main
应改为
main()
2.
scanf("%d%d",a,b);
应改为
scanf("%d%d",&a,&b);
3.
sum=a+b; 应该写在scanf("%d%d",&a,&b);的后面
程序修改如下:
#include
main()
{
int a,b,sum;
scanf("%d%d",&a,&b);
sum=a+b;
printf("sum is %d",sum);
}
一个更标准的程序如下:
#include
int main(void)
{
int a,b,sum;
scanf("%d%d",&a,&b);
sum=a+b;
printf("sum is %d",sum);
return 0;
}
**********************************************
#include
int main(void)
{
float a,b;
scanf("%f%f",&a,&b);
printf("%g+%g=%g",a,b,a+b);
return 0;
}