http://pat.zju.edu.cn/contests/pat-practise/1001-优快云博客

本文介绍了一个简单的编程问题：计算两个整数a和b的和，并将结果以标准格式输出，即每三位数字用逗号分隔。文章提供了一个C++实现示例。

 1001. A+B Format (20)
     时间限制
   

     400 ms
    
 
   

     内存限制
   

     32000 kB
    
 
   

     代码长度限制
   

     16000 B
    
 
   

     判题程序
   
 
    Standard
   

    作者
  

    CHEN, Yue
   
 
  
 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
 Each input file contains one test case. Each case contains a pair of integers a and b where -1000000 <= a, b <= 1000000. The numbers are separated by a space.
 
 Output
 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
   [cpp]view plaincopy
#include<iostream>  
#include<cstdio>  
#include<cstdlib>  
#include<algorithm>  
#include<memory.h>  
#include<string>  
using namespace std;  
  
int main(){  
    //freopen("in.txt", "r", stdin);  
      
    int a, b;  
    char s[10];  
    int ans;  
    while(cin>>a>>b){  
        ans = a+b;  
        if(ans<0){  
            printf("-");  
            ans = -ans;  
        }  
          
        int k = 0;  
        if(ans==0)  
            s[k++]='0';  
        while(ans!=0){  
            s[k++] = ans%10 + '0';  
            ans /= 10;  
        }  
        s[k] = '\0';  
          
        int len = strlen(s);  
        for(int i=len-1;i>=0;i--){  
            printf("%c", s[i]);  
            if(i%3==0 && i!=0)  
                printf(",");  
        }  
        printf("\n");  
    }  
  
  
    //fclose(stdin);  
  
}  