rename() problem

This is a discussion on rename() problem within the C Programming forums, part of the General Programming Boards category; I'm having a tough time trying to figure out what the heck is wrong with my code. If anyone would ...

  1. #1
    Dimeslime
    Guest

    rename() problem

    I'm having a tough time trying to figure out what the heck is wrong with my code.
    If anyone would like to help, that'd be cool.

    here's my code.

    #include <stdio.h>
    #include <stdlib.h>
    #include <conio.h>

    void renamefile( void );

    int main()
    {
    int input;

    for( input = 0; input <= 2; input++)
    {
    printf(">>>> 1. Rename file\n");
    printf(">>>> 2. Exit Program\n");
    printf("\nEnter selection: ");
    scanf("%d", &input);

    if( input == 1 )
    {
    printf("Entering Rename file. . .\n");
    renamefile();

    if( input == 2 )
    {
    printf("Exit program...\n");
    exit(0);
    }
    }
    }
    return input;
    }


    void renamefile( void )
    {
    char oldname[80], newname[80];

    printf("Enter current filename: ", oldname);
    gets(oldname);
    printf("Enter new filename: ", newname);
    gets(newname);

    if( rename( oldname, newname ) == 0)
    printf("File %s has been rename to %s.\n", oldname, newname);
    else
    fprintf(stderr, "Somethings screwed.\n");


    }

    When it compiles, it's all good and dandy then when I execute it it outputs this

    >>>> 1. Rename file
    >>>> 2. Exit program

    Enter Selection: 1
    Entering Rename file. . .

    Enter current filename: Enter new filename:

    As you can see, it's not exactly doing what i want it to...
    Any suggestions?

    Thanks
    Russ.

  2. #2
    Has a Masters in B.S.
    Join Date
    Aug 2001
    Posts
    2,267
    after each gets() try
    fflush(stdin);
    ADVISORY: This users posts are rated CP-MA, for Mature Audiences only.

  3. #3
    and the hat of wrongness Salem's Avatar
    Join Date
    Aug 2001
    Location
    The edge of the known universe
    Posts
    32,590

    Actually scanf problem

    You're mixing scanf with other input functions.
    http://www.eskimo.com/~scs/C-faq/q12.18.html

    scanf makes such a mess of the input stream that you have to tidy it up before using some other input function.

    This is what you need to add to your code
    Code:
    scanf("%d", &input); 
    while ( getchar() != '\n' ) { }  /* Add this line of code */
    This while loop removes the trailing input characters from the numeric input.

    You will also want to start using fgets in place of gets
    http://www.eskimo.com/~scs/C-faq/q12.23.html


    No doubt some people will tell you to use
    fflush( stdin );
    but they are wrong, ignore them.

  4. #4
    Has a Masters in B.S.
    Join Date
    Aug 2001
    Posts
    2,267
    >
    No doubt some people will tell you to use
    fflush( stdin );
    but they are wrong, ignore them.
    <

    hmm....woops.

    ::edit:: cant believe i didn't see that, just shows waht exp will do for ya. Thank You, Salem.
    Last edited by no-one; 02-09-2002 at 01:40 AM.
    ADVISORY: This users posts are rated CP-MA, for Mature Audiences only.

  5. #5
    Dimeslime
    Guest
    I figured it out with your help, thanks a lot guys.

    Russ

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