C++ 代码

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int a,b,sum,t = 1,len,sum1,sum2,temp=0;
    int n[100000];
    cin >> a >> b;
    sum = a + b;
    if(sum<0)
        cout << '-';
    if(sum == 0)
        cout << 0;
    while(sum)
    {
        n[t] = sum%10;
        sum = sum/10;
        t++;
    }
    len = t - 1;
    sum1 = len/3;  //逗号个数
    sum2 = len%3; 
    if(sum2==0)
        sum1--;


    if(sum2 != 0)
    {
        for(int i=t-1;i>t-1-sum2;i--)
            cout << abs(n[i]);
        if(sum1>0)
        {
            cout << ',';
            sum1--;
        }

    }
    for(int i=t-1-sum2;i>=1;i--)
    {
        cout << abs(n[i]);
        temp++;
        if(temp==3 && sum1 != 0)
        {
            cout << ',';
            temp = 0;
            sum1--;
        }
    }

    return 0;
}