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Thread: Need to reduce an integer in ascending/descending Order [ simple steps? ]

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    Default Need to reduce an integer in ascending/descending Order [ simple steps? ]

    Yes, it's related to homework. I need help with a program that can reduce itself. For example, the number 12345 will need to reduce in descending order 1234, 123, and so on. But I've been warned that if I include the number 0 to the number 12345 the program will not execute properly even though it will work. I figured that I can use the mod function [divide by 10,100,1000,...] to decrease the number and only display the remaining number.

    I want someone's opinion on how is the best possible way to write/start the program. I would appreciate a very simple example of such a program or details on how I can start. I should mention I'm a beginner and know basic functions related to Java.

    Thanks.


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    Default Re: Need to reduce an integer in ascending/descending Order [ simple steps? ]

    Quote Originally Posted by Maxfmc View Post
    ...For example, the number 12345 will need to reduce in descending order 1234, 123, and so on.
    Let me make sure I understand the assignment.

    Suppose the number is 123456789. MIght a program run look like the following?

    Enter an integer: 123456789
    123456789
    12345678
    1234567
    123456
    12345
    1234
    123
    12
    1


    Well, how would a program produce that sequence of numbers from the initial one?

    I note that, using integers for the variables, according to the rules of integer arithmetic
    123456789/10 = 12345678

    Also
    12345678/10 = 1234567

    Etc.

    Quote Originally Posted by Maxfmc View Post
    But I've been warned that if I include the number 0 to the number 12345 the program will not execute properly even though it will work.
    What the heck does that mean? If it doesn't execute properly, how can anyone say that it "will work?" Either it works or it doesn't work. If it "works," then that means it executes properly, right? What am I missing here? (How about getting the person who warned you give an example for which he/she thinks that, "it will not execute properly even though it will work.")

    Anyhow, my next question is: What does having a zero digit in the number have to do with anything?

    For example, suppose the number is 102030405. Then a run might look like the following:


    Enter an integer: 102030405
    102030405
    10203040
    1020304
    102030
    10203
    1020
    102
    10
    1


    As before, I note that, using integer arithmetic on integer variables:

    102030405/10 = 10203040

    Also
    10203040/10 = 1020304

    Etc.

    Now, if you had a "leading zero" the simplest kind of Java numerical print function might not show it, so a run could look like

    Enter an integer: 012345
    12345
    1234
    123
    12
    1


    But so what? I mean, are you required to print the leading zero each time? Or is that program output OK? Or what? (I'll assume that output is OK unless you clarify the requirements to explain something more about it.)

    Anyhow...

    I don't know whether there is a "best way" to do anything, but if you had some kind of loop that prints out the value of the number and then divides by 10 each time through the loop, it could show output sequences like my examples. (Eventually you can figure that repeatedly dividing by 10 will result in a quotient whose value is zero. That's how you know when to terminate the loop.)


    I'm not sure what the modulo operator has to do with anything in the context of my interpretation of the assignment.

    But it's entirely possible that I missed something (again).

    If I have misunderstood the assignment, maybe you can enlighten me.



    Cheers!

    Z
    Last edited by Zaphod_b; September 26th, 2012 at 12:42 PM.

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