1001 A+B Format (20 分)

1001 A+B Format (20 分)

#include <cstdio>
#include <cstring>

int main(){
	int a,b,c,n;
	char str[15];
	scanf("%d %d",&a,&b);
	c = a+b;
	if(c<0){
		sprintf(str,"%d",c*-1);
		printf("-");
	}
	else sprintf(str,"%d",c);
	n = strlen(str);
	if(n == 7){
		for(int i =0;i<n;i++){
			if(i ==0||i==3)printf("%c,",str[i]);
			else printf("%c",str[i]);
		}
	}
	else if(n<4)printf("%s",str);
	else {
		for(int i =0;i<n;i++){
			if(i == n-4)printf("%c,",str[i]);
			else printf("%c",str[i]);
		}
	}
	printf("\n");
	

	return 0;
}