invalid conversion from 'const char*' to 'char'

This is a discussion on invalid conversion from 'const char*' to 'char' within the C++ Programming forums, part of the General Programming Boards category; I'm trying to make a little code that makes a 2-dimensional character array and fills it with 0's(or a's or ...

  1. #1
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    invalid conversion from 'const char*' to 'char'

    I'm trying to make a little code that makes a 2-dimensional character array and fills it with 0's(or a's or whatever char) for now.

    it gives me this error when i compile:

    invalid conversion from 'const char*' to 'char'
    here's the code:

    Code:
        int scrsizex=10, scrsizey=10;
        char scr[scrsizey][scrsizex];
        
        for (int county=0; county<scrsizey;county++){
            for (int countx=0; countx<scrsizex;countx++){
                scr[county][countx]="0";
                }
        }
    Compiling with Dev-C++ v4.9.9.2


    Any ideas?

  2. #2
    and the hat of wrongness Salem's Avatar
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    > scr[county][countx]="0";
    Use
    scr[county][countx]=0;
    or
    scr[county][countx]='\0';

    Use the single quotes for letters.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
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    ok, i thought i tried doing that but it didn't work... ok...


    just ran it.
    i think i had tried using ='0' and that's why it didn't work...
    thanks!

  4. #4
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    Actually, '0' should work just as well as '\0'. They are two different letters. '0' is the character zero, while '\0' is the null character. If you print out '0', you will get zeros, but if you print out '\0' you will get nothing. In this case it would probably be better to use an actual character like '0', 'a', '*', ' ' (space), etc.

  5. #5
    C/C++ homeyg's Avatar
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    "0" would actually represent the address of that string and it is complaining because you are trying to assign the address of that string to a char variable when that variable isn't char*.

  6. #6
    and the hat of wrongness Salem's Avatar
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    > scr[county][countx]="0";
    You could write

    scr[county][countx]="0"[0];

    Or even
    scr[county][countx]="0"[1];

    /runs away
    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.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  7. #7
    Confused Magos's Avatar
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    Code:
    int scrsizex=10, scrsizey=10;
    char scr[scrsizey][scrsizex];
    You must use constant sizes, use 'const int' instead of 'int'.
    MagosX.com

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