Coding Challenge #54 C++ int to std::string (no stringstream or to_string())

Gets a string from an integer (ejemplo gratis: 123 -> "123")

Wanted to come up with my own function for this like 10 years ago but couldn't think of a way and used stringstream. Now after all the binary & bitwise stuff I've been doing, the answer easily popped into my head when the topic of getting the last digit in a number came to mind.

 

 // get lowest digit (of base-10 format number)
int getLowestDigit(int num){
    int lowest_digit = num % 10;
    return lowest_digit;
}

// convert number to string (base-10 representation) in probs a super inefficient way
std::string numToString(int num){
    std::string str = "";
    while(num > 0){
        int digi = num % 10; // current right-most digit
        str += '0' + digi;
        num /= 10; // move number over by one base-10 digit's worth
    }
    
    // above number string is backwards. flip it
    std::string fin = "";
    for(int xint = fin.length() - 1;xint > -1;xint--){
        fin += str[xint];
    }
    
    return fin;
}