convert string to char array

This is a discussion on convert string to char array within the C++ Programming forums, part of the General Programming Boards category; I'm trying to convert a string to a char array so that i can choose individual characters at a time. ...

  1. #1
    System-7
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    convert string to char array

    I'm trying to convert a string to a char array so that i can choose individual characters at a time. I've looked around but i can't seem to find a clear solution anywhere. So if anybody could give me an example or the command i need to use to do this, that would be great.

    Thanks,

    ...Dan

  2. #2
    Registered User major_small's Avatar
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    you can access individual chars in an stl string...
    Code:
    std::cout<<str[1]<<std::endl;
    or you could convert it to a C-style string like so:
    Code:
    strcpy(target,str.c_str());
    just make sure your target is big enough to handle the incomming string.
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  3. #3
    Absent Minded Programmer
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    Well, there is the

    basic_string::c_str() command, which returns a char array = to your basic string object..


    You could.... HMm...

    Create a char pointer..

    const char * cptr
    then do a cptr = basic_string object...

    There are probably a few more ways, but those are the highlights
    Sometimes I forget what I am doing when I enter a room, actually, quite often.

  4. #4
    System-7
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    thanks, as usual, guys,

    ...Dan

  5. #5
    Guest Sebastiani's Avatar
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    just being nit-picky here but:

    c_str() is not a command, it's a member function.

    >> then do a cptr = basic_string object...

    although there was talk of adding an implicit conversion to const char*, it never made it to the standard. you have to use a member function or something like &str[0].
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

  6. #6
    Absent Minded Programmer
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    Oopsies..

    I ment do a pptr = basic_string object



    I'm new at this helping thing
    Sometimes I forget what I am doing when I enter a room, actually, quite often.

  7. #7
    xhi
    xhi is offline
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    > I'm trying to convert a string to a char array so that i can choose individual characters at a time.
    if all you need is to choose individual chars at a time there is also string::at(int)
    ex..
    Code:
    string foo = "some string";
    for(int i=0; i<foo.length();++i) cout << foo.at(i);

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