1001 字符串处理

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