PAT 甲级 1001

关键函数：

to_string

string转int :int number = std::atoi( text.c_str() );

代码实现：

#include <iostream>

#include <string>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;}