#include "stdio.h"#include "stdlib.h"int num;int main(void){	long long i, j;	int k;		while(scanf("%d", &num) != EOF)	{		if(!(num >=1 && num<=20))		{			break;		}		for(k=1; k<=num; k++)		{			scanf("%ld %ld", &i, &j);			printf("case %d:\n", k);			printf("%d + %d = %d\n\n", i, j, i+j);		}	}		system("pause");	return 0;}