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Thread: Help with the return concept

  1. #1
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    Default Help with the return concept

    I have a few questions below about this code.


    /*
    * File: FactorialTable.java
    * -------------------------
    * This file generates a table of factorials.
    */

    import acm.program.*;

    public class FactorialTable extends ConsoleProgram {

    public void run() {
    for (int i = LOWER_LIMIT; i <= UPPER_LIMIT; i++) {
    println(i + "! = " + factorial(i));
    }
    }

    private int factorial(int n) {
    int result = 1;
    for (int i = 1; i <= n; i++) {
    result *= i;
    }
    return result;
    }

    /* Private constants */
    private static final int LOWER_LIMIT = 0;
    private static final int UPPER_LIMIT = 10;

    }


    Could someone be kind enough to explain a couple things here. Why is (int n) needed in the private method. I am lost as to how the for loop knows what is less than or equals to n as well. I am lost on some pretty basic concepts and my textbook is very vague. Some explanation would be very great!


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Help with the return concept

    Why is (int n) needed
    Take a look at the tutorial:
    Defining Methods (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
    how the for loop knows what is less than or equals to n
    The for Statement (The Java™ Tutorials > Learning the Java Language > Language Basics)
    If you don't understand my answer, don't ignore it, ask a question.

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