PAT 1001A+B Format

 

 

#include "stdio.h"

int main(){
	long a,b,sum;
	int t[32];
	while(scanf("%ld %ld", &a, &b) != EOF)
	{
		sum = a + b;
		if(sum < 0){
			sum = 0 - sum;
			printf("-");
		}
		
		int i=1,j;
		if(sum < 1000){
			printf("%d", sum);
		}else {
			while(sum!=0){
				t[i] = sum%10;
				sum = sum/10;
				i++;
			}
			for(j=i-1;j>=1;j--){
				if(j%3==0 && j!= i-1) printf(",");
				printf("%d", t[j]);
			}
		}

		printf("\n");
	}
	return 0;
}