PAT (Advanced Level) Practice 1001 A+B Format （20 分)

题目链接：https://pintia.cn/problem-sets/994805342720868352/problems/994805528788582400

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 −. 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 <string>

 #include <cstring>

 #include <algorithm>

 #include <stack>

 using namespace std;

 int main()

 {

        int n,m,sum;

        while(cin>>n>>m){

            sum=n+m;

            if(sum==){

                cout<<<<endl;

                continue;

            }

            int flag=;

            if(sum<){

            flag=;

            sum=-sum;

            }

            char c='-';

            stack<char> s;

            int t=;

            while(sum){

                c=sum%+'';

                s.push(c);

                t++;

                if(t%==&&sum/) s.push(',');

                sum/=;

            }

            if(flag) s.push('-');

            while(!s.empty()){

                cout<<s.top();

             s.pop();

            }

            cout<<endl;

        }

     return ;

 }

巴特西

PAT (Advanced Level) Practice 1001 A+B Format （20 分)

Input Specification:

Output Specification:

Sample Input:

Sample Output:

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