PAT 1001 A+B Format 使用地址传参的方式

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

#include<iostream>
#include<cstdio>
#include<cmath>
#include<stack>
using namespace std;
int  bit(int *sum)
{
    
    int n=*sum%10;
    *sum=*sum/10;
    //printf("%d
",n);
    //printf("%d
",*sum);
    return n;
}
stack<int> s;
int main()
{
    int a,b,sum;
    while(scanf("%d %d",&a,&b)!=EOF)
    {
        int flag=0;
        sum=a+b;
        if(sum<0)
            flag=0;
        else
            flag=1;
        int i=0;
        int j=1;
        sum=abs(sum);
        //printf("%d
",sum);
        while(sum>9)
        {
            s.push(bit(&sum));
            j=j+1;
        }
        s.push(sum);
        if(flag==0)
        printf("-");
        while(!s.empty())
        {
          i=i+1;
          int k=s.top();
          s.pop();
          printf("%d",k);
          if(s.empty())
          break;
          if((j-i)%3==0)
          printf(",");
        }
        printf("
");
    }
    return 0;
 }