1001. A+B Format (20)

#include<cstdio>
using namespace std;
int main(){
int a,b,sum,counter=0;
int result[10];
scanf("%d %d",&a,&b);
sum = a+b;
if(sum<0){ printf("-");
sum = sum*-1;
}
if(sum ==0) printf("0");
while(sum!=0){
result[counter++] = sum%10;
sum /=10;
}
for(int i = counter-1;i>=0;i--){
if(i!=(counter-1)&&(i+1)%3==0)
printf(",");
printf("%d", result[i]);
}
}