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Thread: Factorial loop help

  1. #1
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    Default Factorial loop help

    Ok so I need to find the smallest integer whose factorial is greater than 2000

    current code:
    public class FactorialInt {
    public static void main (String args[]){

    int value = 7, factorial = 1, temp= value;

    while(temp > 0){
    factorial *=temp;
    temp--;
    }
    System.out.println("The factorial of " + value + " is " + factorial + ".");
    }}


    not sure how to change this code to solve problem. I can find the factorial for a int that i set but i how do i have it find the int that meets the requirements?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Factorial loop help

    how do i have it find the int that meets the requirements?
    Brute force? Start with 3 and go from there until you've found the int that meets the requirements.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Factorial loop help

    i did that and its 7, bit the program is to i guess run a loop that finds that number

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    Default Re: Factorial loop help

    The loop needs to keep changing the number until the desired results are found.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Factorial loop help

    not sure how to make that happen since i have a loop going already, do i add another loop or does my current loop need to be changed?

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    Default Re: Factorial loop help

    Have a loop that starts at 1 and changes the factor until the desired result.
    Save the last factorial and use for next computation.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Factorial loop help

    public class FactorialInt {

    public static void main (String args[]){
    int input_number = 0;
    int factorial = 1;

    while (factorial < 2000){
    input_number = input_number + 1;
    factorial = factorial * input_number;
    }
    System.out.println( "The Factorial of " + input_number+ " is " + factorial );
    }
    }


    this seems to work please check!

  8. #8
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    Default Re: Factorial loop help

    this seems to work
    If you get the correct results, then that solves it.
    If you don't understand my answer, don't ignore it, ask a question.

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