a244: 新手訓練 ~ for + if FYI: https://yunlinsong.blogspot.com/2015/12/for-if.html

a244.cpp

#include <cstdio>

int main() {
	int n;
    while(scanf("%d", &n) != EOF)
	{
		int a;
		long long int b, c;

		for(int i = 0; i < n; i++)
		{
			scanf("%d %lld %lld", &a, &b, &c);
			switch(a) {
				case 1:
					printf("%lld", b+c);
					break;
				case 2:
					printf("%lld", b-c);
				    break;
				case 3:
					printf("%lld", b*c);
					break;
				case 4:
					printf("%lld", b/c);
					break;
				default:
					break;
			}
			printf("\n");
		}

	}
    return 0;
}