removing spaces from a string

This is a discussion on removing spaces from a string within the C++ Programming forums, part of the General Programming Boards category; hey everyone i have a fairly straightforward problem that i cant seem to find an easy answer to. I want ...

  1. #1
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    removing spaces from a string

    hey everyone i have a fairly straightforward problem that i cant seem to find an easy answer to. I want to remove the spaces from the beginning of a string. I was wondering if there is a build in function for this that i could take advantage of. I know its not hard, i just dont want to reinvent the wheel. I have the librarys included so i may as well make use of them.

    Code:
     string = "        hello";
    i just want the output to be hello without the leading spaces.



    thanks in advance,
    Brad.

  2. #2
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    >I want to remove the spaces from the beginning of a string.
    I don't know if this is the easiest way, but try this.
    Code:
       string = string.substr(string.find_first_not_of(' '));

  3. #3
    Tropical Coder Darryl's Avatar
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    Well, you could try using remove_if, but writing the predicate for it will be just as much work as just removing the spaces manually (maybe more).

    EDIT 2: Swoopy's Idea can be simplified even more

    Code:
    a_string.erase(0,a_string.find_first_not_of(' '));
    Last edited by Darryl; 07-28-2005 at 01:28 PM.

  4. #4
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    >Swoopy's Idea can be simplified even more
    Darryl, and your code is also more readable. The erase() makes it obvious what's happening.

  5. #5
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    you could use string stream;

    [URL=http://www.cplusplus.com/ref/iostream/stringstream/stringstream.html[/URL]


    Code:
    #include <iostream>
    #include <string>
    #include <sstream>
    
    using namespace std;
    
    int main()
    {
    	string mystring = ("           Hel lo            ");
    	string mystring2;
    	stringstream ss(stringstream::in | stringstream::out);
    	ss << mystring;
    	while(ss >> mystring2)
    	{
    		cout << mystring2 << endl;
    	}
    	cin.get();
    	return 0;
    }

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