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Thread: My program always gives me an output of 0.0, what's wrong with it?

  1. #1
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    Exclamation My program always gives me an output of 0.0, what's wrong with it?

    *Edit: I fixed it thanks to aprabhat! Thanks for your help!*

    I'm at the beginner level when it comes to Java, so I don't really know much about programming, but I'm taking a class on Java and we were asked to write a program that prompts the user for three different values (P,i, and n as you will see in my code) and use those values to calculate interest on a certain amount of money (P) that the user is prompted for. So I wrote it all and it will compile and run, but for some reason I always get an output of zero. I have tried using both double and float variables instead of integer variables because I know that integer variables always round, but it doesn't work. Also, when I use float variables my program won't compile because the power method requires a double variable because there is "a possible loss of precision" so I used double variables in the code in this post. Thanks ahead of time for the help. Well anyways, here's my code:


    public class Unit7Assignment_2
    {
    public static void main( String [] args )
    {
    int P = 0;
    double i = 0;
    int n = 0;
    double S = interest( P, i, n );

    P = Input.getInt( "Please enter an integer value for the amount of money deposited at the beginning of the year" );
    i = Input.getDouble( "Please input a double value for the annual interest rate" );
    n = Input.getInt( "Please enter an integer value for the amount of time in years that the money deposited has accrued the interest" );

    if ( n == 1 )
    {
    System.out.println();
    System.out.println( "The amount of money in the account after 1 year is $" + S );
    System.out.println();
    }
    else
    {
    System.out.println();
    System.out.println( "The amount of money in the account after " + n + " years is $" + S );
    System.out.println();
    }
    }

    public static double interest( double P, double i, double n )
    {
    double j = 1 + i;
    double k = Math.pow( j, n );
    double m = k * P;
    return m;
    }
    }
    Last edited by thepiranha; December 31st, 2013 at 12:32 AM. Reason: Fixed the Problem!


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: My program always gives me an output of 0.0, what's wrong with it?

    Check the order of your commands. Java executes top-down in a block.

  3. #3
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    Default Re: My program always gives me an output of 0.0, what's wrong with it?

    Which commands? The equations to calculate my return value?

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    Default Re: My program always gives me an output of 0.0, what's wrong with it?

    In your code
    double S = interest( P, i, n );
    P = Input.getInt( "Please enter an integer value for the amount of money deposited at the beginning of the year" );
    i = Input.getDouble( "Please input a double value for the annual interest rate" );
    n = Input.getInt( "Please enter an integer value for the amount of time in years that the money deposited has accrued the interest" );
    you take input for the variables P,i,n after calling the function so the function take value 0 as all the arguments and return 0.0 as result.

  5. The Following User Says Thank You to aprabhat For This Useful Post:

    thepiranha (December 31st, 2013)

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