Remove spaces from std::string in C++

Question

What is the preferred way to remove spaces from a string in C++? I could loop through all the characters and build a new string, but is there a better way?

Answer 1

Hi, you can do something like that. This function deletes all spaces.

string delSpaces(string &str) 
{
   str.erase(std::remove(str.begin(), str.end(), ' '), str.end());
   return str;
}

---

I made another function, that deletes all unnecessary spaces.

string delUnnecessary(string &str)
{
    int size = str.length();
    for(int j = 0; j<=size; j++)
    {
        for(int i = 0; i <=j; i++)
        {
            if(str[i] == ' ' && str[i+1] == ' ')
            {
                str.erase(str.begin() + i);
            }
            else if(str[0]== ' ')
            {
                str.erase(str.begin());
            }
            else if(str[i] == '\0' && str[i-1]== ' ')
            {
                str.erase(str.end() - 1);
            }
        }
    }
    return str;
}