Java integer limit

**jobi** · April 2nd, 2013, 10:22 PM

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!!!

**helloworld922** · April 2nd, 2013, 11:33 PM

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

**jobi** · April 3rd, 2013, 06:28 AM

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

**Norm** · April 3rd, 2013, 06:58 AM

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.

**jobi** · April 4th, 2013, 01:42 AM

So I should use a while loop??

**Norm** · April 4th, 2013, 07:15 AM

Try coding it like shown in post#2

**helloworld922** · April 4th, 2013, 03:27 PM

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

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