PAT a1001题解

#include <cstdio>

int num[10];

int main(){
	int a, b, sum;
	scanf("%d%d", &a, &b);
	sum = a + b;
	if(sum < 0){
		printf("-");
		sum = -sum;
	}
	int len = 0;
	if(sum == 0){
		num[len++] = 0;	
	}
	while(sum){
		num[len++] = sum % 10;
		sum /= 10;
	}
	for(int i = len - 1; i >= 0; i--){
		printf("%d", num[i]);
		if(i > 0 && i % 3 == 0){
			printf(",");
		}
	}
	return 0;
}