Question

I have the following code but it only converts strings to double. if the string contains a letter, it causes an error

 while (cin >> s){
        const char *c_ptr=s.c_str();
        d = atof(c_ptr);
        v.push_back(d);
    }

I want to input a string like “a1.2 3 4b” and have the vector populated with “1.2 3 4”

Answer 1

What about this:

1) replace all chars in the string that aren't digits or decimal points by spaces
2) read doubles in a loop

since you got rid of the letters before parsing the doubles, they should no longer cause issues.