1001 A+B Format （20 分)

1001 A+B Format （20 分)

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 −106≤a,b≤106. 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

作者: CHEN, Yue

单位: 浙江大学

时间限制: 400 ms

内存限制: 64 MB

代码长度限制: 16 KB

题目大意

计算两个数的和，以逗号分隔后输出

分析

计算和，在相应位置输出逗号即可

代码

#include <iostream>
using namespace std;

int main() {
    int a,b;
    cin>>a>>b;
    int c=a+b;
    if(c<0) {
        cout << "-";
        c=-c;
    }
    string s=to_string(c);
    int l=s.length();
    for(int i=0;i<l;i++){
        cout<<s[i];
        if(i+1!=l&&(i+1)%3==l%3)
            cout<<",";
    }
    return 0;
}