程序代码：

#include<stdio.h>
int main()
{
    int T,i;
    double x,y;
    scanf("%d",&T);
    for(i=1;i<=T;i++)
      {
         scanf("%lf%lf",&x,&y);
         printf("case %d:\n",i);
         printf("%ld + %ld = %ld\n\n",x,y,(int)(x+y));
      }
    getch();
    return 0;
}