#include<stdio.h>
#include<stdlib.h>

int main (void)
{
	int x, y, choice ;
	
	printf("請輸入1~4其中一個數字\n");
	scanf ("%d", &choice);

	do{
	switch(choice){

    	case 1:printf("你輸入的選項是 1 \n");
			   printf("請輸入兩個任意整數 \n");

			   scanf ("%d%d", &x, &y);
			   printf("這兩個數字相加的結果是 %d \n", x+y);
			   break;


		case 2:printf("你輸入的選項是 2 \n");
			   printf("請輸入兩個任意整數 \n");

			   scanf ("%d%d", &x, &y);
			   printf("這兩個數字相減的結果是 %d \n", x-y);
			   break;

		case 3:printf("你輸入的選項是 3 \n");
			   printf("請輸入兩個任意整數 \n");

			   scanf ("%d%d", &x, &y);
			   printf("這兩個數字相乘的結果是 %d \n", x*y);
			   break;

		case 4:printf("你輸入的選項是 4 \n");
			   printf("請輸入兩個任意整數 \n");

			   scanf ("%d%d", &x, &y);
			   printf("這兩個數字相除的結果是 %d \n", x/y);
			   break;

		default:
			printf("您輸入錯誤囉 \n");
		break;
		}
	}

	while ( );

system("pause");
return 0;
}