准备三月份的PAT记录每天的题解
PAT甲级1001

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

int main(void)
{
    freopen("pat0314/in.txt","r",stdin);
    int a,b;
    cin>>a>>b;
    int c = a + b;
    if(c < 0)
    {
        printf("-");
        c = -c;
                if(c < 1000)
        {
            printf("%d",c);
        }
        else if(c >= 1000 && c < 1000000)
        {
            int temp = c /1000;
            printf("%d,",temp);
            printf("%03d",c % 1000);
        }
        else 
        {
            int temp = c / 1000000;
            printf("%d,",temp);
            int temp1 = c % 1000000 / 1000;
            printf("%03d,",temp1);
            int temp2 = c % 1000;
            printf("%03d",temp2);
        }
    }
    else 
    {
        if(c < 1000)
        {
            printf("%d",c);
        }
        else if(c >= 1000 && c < 1000000)
        {
            int temp = c /1000;
            printf("%d,",temp);
            printf("%03d",c % 1000);
        }
        else 
        {
            int temp = c / 1000000;
            printf("%d,",temp);
            int temp1 = c % 1000000 / 1000;
            printf("%03d,",temp1);
            int temp2 = c % 1000;
            printf("%03d",temp2);
        }
    }
    return 0;
}