Thread: isdigit function

  1. #1
    Registered User
    Join Date
    Nov 2005

    isdigit function

    Hi I hope someone can help me with this. I am working on a program that asks the user to select an item from the menu 1-6. I have a while statement that returns to the loop if the user selects any other number. while(userAns<1)||(userAns>6)) I am trying to create an isdigit if statement that will return to the loop if the user selects a char. I have: if(isdigit(c)) I declared my char c, and have the #include<ctype.h> Should the while statement and the if statement be together? The while statement works but the if just loops. Thanks [EMAIL=joejonsmom]function isdigit What am I missing?

  2. #2
    ... kermit's Avatar
    Join Date
    Jan 2003
    You could help us help you by posting your attempt so we can have a look at it and see if you are doing things right or wrong.


  3. #3
    Registered User
    Join Date
    Nov 2005


    Hi actually I got this to work finally but now my if statement to make the loop work is not.

    printf("Would you like to select another option?\n\n");
    printf("1=Yes and 2=No\n\n",ans);

    else if(ans!=1)
    return 0;

    I know this is something really easy but I appreciate any help I can get. Thanks

  4. #4
    Devil's Advocate SlyMaelstrom's Avatar
    Join Date
    May 2004
    Out of scope
     printf("1=Yes and 2=No\n\n",ans);  // Why?
    Sent from my iPadŽ

  5. #5
    Registered User
    Join Date
    Nov 2005

    if loop

    I need a loop which gives the user an option to exit or return to the menu to select another currency.
    What would be a better option Thanks

  6. #6
    Just Lurking Dave_Sinkula's Avatar
    Join Date
    Oct 2002
    Perhaps this old post may be of interest.
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

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