题意：给出俩个整数a,b(不超过10^9) ，求a+b的值 ，并按照xxx,xxx,xxx的格式输出

#include 
     
      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;}