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Thread: for loop that calculates the total of a series of numbers

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    Default for loop that calculates the total of a series of numbers

    Hi, I am having troubles with creating a for loop that calculates the total of a series of numbers: 1/30 + 2/29 + 3/28 + ... 30/1. I don't know where to start and need some help!


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    Default Re: for loop that calculates the total of a series of numbers

    What about that series or programming it don't you understand . . . ?

    Numerator starts at 1 and increases by 1 with each term. Denominator starts at 30 and decreases by 1 with each term. Pretty simple, but maybe it's hard for you to see as a program. What's hard to see?

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    Default Re: for loop that calculates the total of a series of numbers

    I understand the series, and I understand what is being asked of me. But, I do not understand how to set it up in a for loop. I just learned for loops in my class, and I am not sure if this for loop needs 2 variables, given that there is a changing numerator and a denominator, and how to set up the for loop header.

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    Default Re: for loop that calculates the total of a series of numbers

    You need to try and then post the effort with specific questions to get help. We can't write it for you. You could probably do something fancy with just 1 variable in the loop, but make it easier on your brain and use 2.

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    Default Re: for loop that calculates the total of a series of numbers

    This is what I have so far:

     
    for (int x = 1, y = 30; x <= 30, y >= 1; x++, y--)
        {
          int sum = 0;
          sum += (x/y);
        }
     
        System.out.println("The sum of the series of numbers is " + sum);

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    Default Re: for loop that calculates the total of a series of numbers

    One problem could be the code is using int variables which will do int divisions:
    9/10 = 0
    Change the variable type to double to get better results.
    If you don't understand my answer, don't ignore it, ask a question.

  7. The Following User Says Thank You to Norm For This Useful Post:

    JessicaCouture95 (November 3rd, 2013)

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    Default Re: for loop that calculates the total of a series of numbers

    Just revised my code. Does this look good?

    public class Count
    {
     
      public static void main (String[] args) 
     {
        double sum = 0;
     
        for (double x = 1, y = 30; x <= 30 && y >= 1; x++, y--)
        {
        sum += (x/y);
        }
     
        System.out.println("The sum of the series of numbers is " + sum);
     }
    }

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    Default Re: for loop that calculates the total of a series of numbers

    Does it compile, execute and give the correct answer?
    If you don't understand my answer, don't ignore it, ask a question.

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    JessicaCouture95 (November 3rd, 2013)

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    Default Re: for loop that calculates the total of a series of numbers

    Just compiled and executed. It looks good, thank you!

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