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Thread: Help wi this

  1. #1
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    Default Help wi this

    Anybody know how to write this program

    Write a program that asks the user to enter a positive integer, n, and compute the following sum:
    20 + 22 + 23 + ... + 2n


    Hint: use the following to workout the power:

    import java.math.;
    ab = Math.pow(a,b)
    math.pow(a,b) returns double type

  2. #2
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    Default Re: Help wi this

    no one is going to do your homework for you, try, then post the code and tell us where are you stuck

  3. #3
    Super Moderator curmudgeon's Avatar
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    Default Re: Help wi this

    Quote Originally Posted by moucho View Post
    Anybody know how to write this program...
    I know how to do this!

  4. #4
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    Default Re: Help wi this

    Quote Originally Posted by curmudgeon View Post
    I know how to do this!
    this is wat ive done but i dont know if its the right program the question
    import java.util.Scanner;
    public class Maths1{
     
    	public static void main( String[] args)
    	{
    		Scanner input = new Scanner (System.in);
     
    		System.out.println("Enter a number, then enter" +" your power function number.");
    			byte a, b;
     
     
    		a = input.nextByte();
            b = input.nextByte();
            a = (byte) Math.pow(a, b);
     
     
    			System.out.print(a);
     
     
     
    		}
     
    }
    Last edited by Norm; December 28th, 2012 at 12:38 PM. Reason: added code tags

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Help wi this

    Before you can write any code you need to understand what the code needs to do.
    Can you take a value for n and manually work out what the result should be?
    Show the steps you took and what the results are.
    If you don't understand my answer, don't ignore it, ask a question.