PATA-Exercise No.1

PAT甲级练习01

题目：PAT1001

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20170623于华东交通大学

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#include <iostream>using namespace std;int main() {    int a, b;    cin >> a >> b;    string s = to_string(a + b);    int len = s.length();    for (int i = 0; i < len; i++) {        cout << s[i];        if (s[i] == '-') continue;        if ((i + 1) % 3 == len % 3 && i != len - 1) cout << ",";    }    return 0;}