1001 A+B Format (20 point(s))

1001 A+B Format (20 point(s))

Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).

Input Specification:

Each input file contains one test case. Each case contains a pair of integers a and b where −10​6​​≤a,b≤10​6​​. The numbers are separated by a space.

Output Specification:

For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.

Sample Input:

-1000000 9

Sample Output:

-999,991

 

Tips:

1. 注意%d、%3d（补充空格）、%03d（补充0）。

//区分%d %3d %03d %.3d 
#include<iostream>
#include<cstring>
using namespace std;
int main(void)
{
	int a,b;
	scanf("%d%d",&a,&b);
	int sum = a + b;
	if(sum<0){
		printf("-");
		sum = -sum;
	}
	if(sum>=1000000){
		int x=sum/1000000;
		printf("%d,",x);
		int y=sum-x*1000000;
		printf("%03d,",y/1000);
		printf("%03d",y%1000);
	}
	else if(sum<1000000&&sum>=1000){
		printf("%d,%03d",sum/1000,sum%1000);
	} 
	else{
		printf("%d",sum);
	}
	return 0;
 } 

https://pintia.cn/problem-sets/994805342720868352/problems/994805528788582400