sprintf problem

This is a discussion on sprintf problem within the C Programming forums, part of the General Programming Boards category; Hi ! Does sprintf have an buffer or something. I do the following : PrintINT( myFile, "TEST INT ", 4500 ...

  1. #1
    Registered User
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    Jan 2003
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    6

    sprintf problem

    Hi !

    Does sprintf have an buffer or something. I do the following :

    PrintINT( myFile, "TEST INT ", 4500 );
    PrintINT( myFile, "TEST INT ", 4501 );


    void PrintINT( FILE* f, char info[], int varde )
    {

    char sVarde[40];

    sprintf( sVarde, "%d\n", varde );
    strcat( info, " = ");
    strcat( info, sVarde);

    fwrite( info, strlen(info),1,f );


    }


    Result is :

    TEST INT = 4500

    = 4500
    = 4501

    I thougt it should be :-)

    TEST INT = 4500
    TEST INT = 4501


    Many thank's in advance!

    Regards
    Micael

  2. #2
    Registered User
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    Jan 2003
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    6

    Found a way around

    I solved by :

    fprintf( f, "%s", info );
    fprintf( f, "%s", " = " );
    fprintf( f, "%d", varde );
    fprintf( f, "%s", "\n" );


    Regards
    Micael

  3. #3
    Registered User Vber's Avatar
    Join Date
    Nov 2002
    Posts
    807

    Hmm,

    Why you did it in 4 statemants?
    Make it in only one statement, you don't need the 4.

    Code:
    fprintf(f,"%s%s%d%s",info," = ",varde,"\n");

  4. #4
    Green Member Cshot's Avatar
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    Jun 2002
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    892
    The problem is you passed in "TEST INT " which should be treated as a constant string. But you tried modifying this string by using strcat and this could potentially cause problems because you're modifying memory you're not supposed to.
    Try not.
    Do or do not.
    There is no try.

    - Master Yoda

  5. #5
    Registered User
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    6

    Smile Thanks

    Thanks for all your help !
    It's easy to be a beginner with a resource like this !!

    Regards
    Micael

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