basic input

This is a discussion on basic input within the Game Programming forums, part of the General Programming Boards category; i have this code: Code: cout<<"level number:"; cin>>levnum; it goes it loops of itself if u input wildcards or chars ...

  1. #1
    Mmm. Purple.
    Join Date
    May 2002
    Posts
    154

    Arrow basic input

    i have this code:
    Code:
    cout<<"level number:";
    cin>>levnum;
    it goes it loops of itself if u input wildcards or chars
    how would i stop it doing this ie return an error saying incorrect levnum?

  2. #2
    Code Goddess Prelude's Avatar
    Join Date
    Sep 2001
    Posts
    9,796
    Read a string instead of whatever levnum is now and validate it by checking the length of the string and that each element matches a digit and that the number is within your range for levels, then convert it to an integer with atoi.

    -Prelude
    My best code is written with the delete key.

  3. #3
    Programming is fun, mkay?
    Join Date
    Oct 2001
    Posts
    490

    Post Use isdigit()!

    After you get the input do this:

    #include <ctype.h>

    if(isdigit(levelnum))
    {
    // Is a digit
    }
    else
    {
    cout << "Must be digit!";
    }
    Website(s): http://www16.brinkster.com/trifaze/

    E-mail: trifaze_mattu@lycos.com

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