Remove extra white spaces in C++

Question

I tried to write a script that removes extra white spaces but I didn\'t manage to finish it.

Basically I want to transform abc sssd g g sdg gg gf into

Answer 1

Since you use C++, you can take advantage of standard-library features designed for that sort of work. You could use std::string (instead of char[0x255]) and std::istringstream, which will replace most of the pointer arithmetic.

First, make a string stream:

std::istringstream stream(input);

Then, read strings from it. It will remove the whitespace delimiters automatically:

std::string word;
while (stream >> word)
{
    ...
}

Inside the loop, build your output string:

    if (!output.empty()) // special case: no space before first word
        output += ' ';
    output += word;

A disadvantage of this method is that it allocates memory dynamically (including several reallocations, performed when the output string grows).