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Thread: Adding fractions

  1. #1
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    Default Adding fractions

    Hello everyone, this should be an easy problem for anyone her I believe because I'm just not noticing why it won't display the answer. I'm trying to solve this book problem......
    "Write a for loop that calculates the total of the follower series of numbers:
    1/30 + 2/29 + 3/28......+30/1"

    Here is what I have..
    public static void main(String[] args) {
    double total = 0;
    for (double a = 1, b = 30; b < 1; a++, b--) {
    total += (a / b);
    }
    System.out.println(total);

    }
    }
    When launched, the output is 0.0. I tried changing the variables a and b to doubles but didn't change anything, any help? Thanks!

    P.s how do you post a code correctly on this forum?
    Last edited by freefora11; March 8th, 2014 at 05:44 PM.


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    Default Re: Adding fractions

    Show the version with doubles. Read about 'integer math'.

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    Default Re: Adding fractions

    Hi,

    To post code in the forum, simply wrap the code with [code] tags, e.g.,

    [code]Your
    code
    here[/code].

    The problem is in your 'for' loop:

    for (double a = 1, b = 30; b < 1; a++, b--) {

    The parts of a 'for' loop:

    for (initialization; termination; increment)

    When the termination expression evaluates to false, the loop terminates. Your termination expression is b < 1, whereas your initialisation expression for b is b = 30.

    If you still don't see the problem, try adding

    System.out.println("a = " + a);
    System.out.println("b = " + b);

    to the body of your 'for' loop.

  4. The Following User Says Thank You to jashburn For This Useful Post:

    freefora11 (March 8th, 2014)

  5. #4
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    Default Re: Adding fractions

    Oh duh, for some reason I thought when its true it terminates, thanks for the refresher, I just changed it to b > 1. Thanks

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