PAT Advanced 1001 A+B Format (20 分)

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<stack>

using namespace std;

int main() {

    long a,b;

    cin>>a>>b;

    long res=a+b;

    if(res==){

        cout<<;

        system("pause");

        return ;

    }

    bool sign;

    int m=;

    if(res<) {

        sign=false;

        res=-res;

    }

    else sign=true;

    stack<char> sta;

    while(res!=){

        m++;

        sta.push(res%+'');

        res/=;

        if(m%==) sta.push(',');

    }

    if(sta.top()==',') sta.pop();

    if(!sign) cout<<"-";

    while(!sta.empty()){

        cout<<sta.top();

        sta.pop();

    }

    system("pause");

    return ;

}

巴特西

PAT Advanced 1001 A+B Format (20 分)

Input Specification:

Output Specification:

Sample Input:

Sample Output:

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