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Thread: Java integer limit

  1. #1
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    Default Java integer limit

    Hi, does anyone know how to set a limit to a number a user inputs? I am making a practice program that determines the price of a customers order and I need to set a limit to how many items they are allowed to purchase. The limit is 40.

    here is what I have:

    if ( number >40 )
    System.out.print( "Error: Limited number of items available. Please enter a number under 40. " );

    This works for displaying an error message, however I would like the customer to be able to enter another number after they receive that error. So it would look like this

    Please enter a number: 45
    Error: Limited number of items available. Please enter a number under 40.
    Please enter a number: <---------(loops back to original question)

    Thanks!!!


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Java integer limit

    There is a "one and a half" loop design pattern:

    Ask user for input
    while(input not valid):
        print error message
        Ask user for input

  3. #3
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    Default Re: Java integer limit

    I'm not quite sure I understand what you mean. Can you elaborate? I'm very new to programming.

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    Super Moderator Norm's Avatar
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    Default Re: Java integer limit

    The while loop following the user inputting some data won't execute if the data in valid.
    If the data is not valid, the while loop will execute and continue looping until the user enters good data.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Java integer limit

    So I should use a while loop??

  6. #6
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    Default Re: Java integer limit

    Try coding it like shown in post#2
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Java integer limit

    A while loop would make sense (I used it in my pseudo-example).

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