string concat

This is a discussion on string concat within the C++ Programming forums, part of the General Programming Boards category; Hey, I'm trying to concatenate strings with const chars (letters in the double quotes). I've tried using the + way, ...

  1. #1
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    string concat

    Hey,

    I'm trying to concatenate strings with const chars (letters in the double quotes). I've tried using the + way, the sprintf, and strcat. None work... An example piece below...

    Code:
    #include <iostream>
    #include <string>
    
    using namespace std;
    
    int main ( int argc, char *argv[])
    {
         string word1 = "this is a string";
         string word2;
    
         word2 = "hello" + word1 + "\n";
    
         return 0;
    }
    ***not my actual code, it's just extremely similar to it***

    That's what I'm trying to do... can anyone help (i don't want to use c-strings)

    Thanks in advance,

    Guitarist809
    Last edited by guitarist809; 12-14-2007 at 03:49 PM.
    ~guitarist809~

  2. #2
    and the hat of wrongness Salem's Avatar
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    How about something which compiles first?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    Quote Originally Posted by Salem View Post
    How about something which compiles first?
    ...?

    I don't know if that'll compile, I just wrote it because my code is long, this is just short and simple. Should be almost the same thing though. trying to do string += "text" + anotherstring;
    ~guitarist809~

  4. #4
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    There's nothing wrong with the code you currently have posted. Why do you think it doesn't work?

    If you do "some" + "text" where you have back to back string literals, it might not work, but that's just a guess of a common problem.

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    Fixed - code I had was bad in many ways
    Last edited by guitarist809; 12-14-2007 at 04:06 PM.
    ~guitarist809~

  6. #6
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    spaces_left is an int. You can't add an int to a string with operator+.

    What you want to use is a stringstream. Then you can concatenate everything together with operator<< and get the string from it when you are done.

  7. #7
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    Quote Originally Posted by Daved View Post
    spaces_left is an int. You can't add an int to a string with operator+.

    What you want to use is a stringstream. Then you can concatenate everything together with operator<< and get the string from it when you are done.
    Yep

    Thanks Daved!
    ~guitarist809~

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