Erasing all non-numbers on a string using recursion

manpreet Best Answer 2 years ago

I have a task to check a string if it contains non-numbers in it and then remove those.

I tried this code below and it doesn't work. Could someone point out what's wrong with my code?

recursiveNAN(string num, int pos)
    {
        char tmp=num[pos];
        if(pos<0)
        {
            this->create(); //allocates memory for the new number
            *this->num = stoi(num); //translate string to number
        }
        if (isdigit(tmp)&&pos>=0)
        {
            this->recursiveNAN(num, pos-1); 
        }
        else if (!isdigit(tmp) && pos>=0)
        {

            num.erase(pos,1);
            this->recursiveNAN(num,pos-1); 
        }
    }

It doesn't say any errors while compiling but it does while debugging.

manpreet 2 years ago

This can be quickly ref="https://forum.tuteehub.com/tag/d">done using regex:

#incluref="https://forum.tuteehub.com/tag/d">de ream>
#incluref="https://forum.tuteehub.com/tag/d">de ring>
#incluref="https://forum.tuteehub.com/tag/d">de <regex>


int ref="https://forum.tuteehub.com/tag/main">main()
{
    stref="https://forum.tuteehub.com/tag/d">d::string s("14scref="https://forum.tuteehub.com/tag/d">ds3vkj12");
    stref="https://forum.tuteehub.com/tag/d">d::regex r("\\D+");
    stref="https://forum.tuteehub.com/tag/d">d::cout<<stref="https://forum.tuteehub.com/tag/d">d::stoi(stref="https://forum.tuteehub.com/tag/d">d::regex_replace(s,r,""));
}

outputs: