View Code of Problem 3689

#include<stdio.h>
#include<string.h>
#include<math.h>
int main()
{
	int t,i,k=1;
	scanf("%d",&t);
	while(t--)
	{
		int a,b;
		scanf("%d%d",&a,&b);
		printf("Case #%d:\n%d\n",k++,a-b);
	}
	return 0;
}