string::erase alternative

[wnp007]

Is there any alternative for erasing a string character when using a loop and still manage to keep the last character? I'm trying to do this in a for loop in my extraction operator overloading. The addition work well but the last character in the string array is not displayed for example, 1256 + 1000 will return 225[?]. Not sure how to go about this

for (int i = s.size()-1 ; i >= 0; --i) {
          n.digits[i] = s[0] - '0';
          s.erase(0, 1);
      }

[Repeater]

I don't follow. What are you trying to do? The code you have shown us doesn't display any values. What are you trying to do with the string?

[wnp007]

The string is the input extracted from the stream

istream& operator>> (istream& in, RLint& n) {
    string s;
    if (in >> s) {
        
        n = 0;
        for (int i = s.size()-1 ; i >= 0; --i) {
            n.digits[i] = s[0] - '0';
            s.erase(0, 1);
        }
    }
    return in;
} 

[wnp007]

I actually figured that it's not the source of error in my code. Thanks