程序代码：

#include <stdio.h>
int main (void)
{
    double a, b;
    int c = 0;
    while (scanf ("%lf%lf", &a, &b) != EOF)
    {
   
        c = c + 1;
        printf ("Case %d:\n", c);
        printf ("%.0lf+%.0lf=%.0lf\n", a, b, a + b);
    }
    return 0;
}