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Need a loop allowing for repeated user input until exit

 
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Need a loop allowing for repeated user input until exit
Reason4
23 Jan, 2008 - 10:17 AM
Post #1

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Folks, when I set up the following code my program will compile. However, it hangs after the first user choice and will not run past that point.

Pseudocode:

Menu offers choice of options 1, 2, 3, or 4.

Program prompts user to enter 1, 2, 3, or 4.

Input processed as follows:

While option >= 1 && option <5;
{
If option = 1:
System.out “You have chosen Option 1.”

If option = 2:
System.out “You have chosen Option 2.”

If option = 3:
System.out “You have chosen Option 3.”

If option = 4:
Exit Program
}

/Pseudocode:

My question is, why is the loop not working? Does anyone have any suggestions on what to use to make the loop functional?

PS: This is not a current homework assignment. It is part of a program I submitted in a class that I have finished. I just want to get to the bottom of the code.
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PennyBoki
RE: Need A Loop Allowing For Repeated User Input Until Exit
23 Jan, 2008 - 10:41 AM
Post #2

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I don't understand why the loop doesn't work because I don't understand what your code is suppose to do. Please explain better.
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ajwsurfer
RE: Need A Loop Allowing For Repeated User Input Until Exit
23 Jan, 2008 - 11:26 AM
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I'm surprised you got Pseudocode to compile, he, he smile.gif

How come this won't compile in Java?

CODE


print  "Hello World!"
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Reason4
RE: Need A Loop Allowing For Repeated User Input Until Exit
23 Jan, 2008 - 07:31 PM
Post #4

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What I want the program to do is offer a user four options. Three of those options will generate a message when the user picks them. The fourth choice exits the program.

My problem is that all loop examples I have seen involve simple countdowns of some kind, liks this:

CODE


for (i = 1; i<6; i++) {
    System.out.println (i);



But what do you do when you don't want a straight run through the loop? I want a user to be able to keep entering choices 1 through 3 until they get tired of it, then exit by choosing 4. Right now the best I can get is one choice by the user, then the program ends. It is not stepping through the loop for some reason.

I wonder if a DO WHILE loop would work?

I have tried using SWITCH and the program still hangs.

PS: Thanks for your willingness to help -- I know I don't give the best explanations in the world. smile.gif

QUOTE(PennyBoki @ 23 Jan, 2008 - 11:41 AM) *

I don't understand why the loop doesn't work because I don't understand what your code is suppose to do. Please explain better.
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Reason4
RE: Need A Loop Allowing For Repeated User Input Until Exit
23 Jan, 2008 - 07:40 PM
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It looks like this is again getting back to my trouble with explanations. I am not asking for precise coding as an answer. I would like to know whether I am approaching the program logic correctly. I have tried (with regular Java-type code) using WHILE, IF, and SWITCH statements. I have not yet tried DO WHILE, but still think maybe SWITCH is the way to go. Or is there something else entirely I am missing? Should I try and nest each potential choice?

Anyway, all the above is why I used pseudocode. Sorry.

QUOTE(ajwsurfer @ 23 Jan, 2008 - 12:26 PM) *

I'm surprised you got Pseudocode to compile, he, he smile.gif

How come this won't compile in Java?

CODE


print  "Hello World!"
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capty99
RE: Need A Loop Allowing For Repeated User Input Until Exit
23 Jan, 2008 - 08:19 PM
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you need to have the part where you ask the user for a number inside your loop.

so either do a while loop where you set the variable initally outside the loop. (just fib it and say userNum = 2 for example), and then ask in the loop while(userNum >= 1 etc....

or do a do while .

just make sure the prompt is in the loop.



i have a working version of your code if you need help , but its a simple fix.

This post has been edited by capty99: 23 Jan, 2008 - 08:17 PM
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Reason4
RE: Need A Loop Allowing For Repeated User Input Until Exit
24 Jan, 2008 - 07:36 AM
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I will give it a try before asking for the "cheat sheet" biggrin.gif

And thank you so much for the tip! That had not occurred to me -- obviously! blink.gif

QUOTE(capty99 @ 23 Jan, 2008 - 09:19 PM) *

you need to have the part where you ask the user for a number inside your loop.

so either do a while loop where you set the variable initally outside the loop. (just fib it and say userNum = 2 for example), and then ask in the loop while(userNum >= 1 etc....

or do a do while .

just make sure the prompt is in the loop.



i have a working version of your code if you need help , but its a simple fix.
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Reason4
RE: Need A Loop Allowing For Repeated User Input Until Exit
25 Jan, 2008 - 01:38 PM
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Okay, if you have the working code, I will take it now... sigh.

QUOTE(capty99 @ 23 Jan, 2008 - 09:19 PM) *

you need to have the part where you ask the user for a number inside your loop.

so either do a while loop where you set the variable initally outside the loop. (just fib it and say userNum = 2 for example), and then ask in the loop while(userNum >= 1 etc....

or do a do while .

just make sure the prompt is in the loop.



i have a working version of your code if you need help , but its a simple fix.
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