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Thread: Help please!

  1. #1
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    Default Help please!

    Hi guys,

    I need some help with this code, I just can't get it to run.

    Thanks!
    import java.util.Scanner;
          public class Invest{
                public static void main(String[] args){
          Scanner reader = new Scanner(System.in);
     
    	 double principal = 0;
     
    	 double rate = 0;
    	 int years = 0;
     
    	 double total = 0;
     
    	 System.out.println ("Enter your initial investment amount: ");
    	  principal = reader.nextInt();
     
     
         System.out.println ("Enter the number of years: ");
    	 rate = reader.nextInt();
     
     
    	 System.out.println ("Enter the interst rate: ");
    	 rate = reader.nextInt();
     
     
    	   total= (rate*years)*principal;
     
     
    	   {
     
     
     
    	      //System.out.println(" years");
     
    	     }
    	     System.out.print("your total investment is:" + total);
    	   }
     
    }
    Last edited by cindisue; March 28th, 2011 at 09:35 AM.

  2. #2
    Member vanDarg's Avatar
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    Default Re: Help please!

    For starters, principal, rate, and total are all of type double. Either change the types to int, or use the method nextDouble() rather than nextInt(). You may also want to tell us why it won't run. Will it compile, what error messages?
    "Everything should be made as simple as possible, but not simpler."
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  3. The Following User Says Thank You to vanDarg For This Useful Post:

    cindisue (March 30th, 2011)

  4. #3
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    Default Re: Help please!

    thank you, it was compiling but then giving me an error in the command line when I ran it, that was it and and I will need to work out the math

  5. #4
    mmm.. coffee JavaPF's Avatar
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    Default Re: Help please!

    I compiled your code and it ran fine. Did you recently update it? If this thread now solved?
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  6. #5
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    Default Re: Help please!

    I have changed the code and it worked in that version, however, my classmate told me that was not the correct output so I am trying to use string format and for some reason it will compile and take input but not display the table in the command line.

     
    import java.io.*;
    import java.util.Scanner;
          public class Invest{
                public static void main(String[] args){
          Scanner reader = new Scanner(System.in);
     
     
    	 double principal = 0;
    	 double rate = 0;
    	 int years = 0;
    	 double total = 0;
    	 int yearCount = 1;
    	 double gain = 0;
     
    	 System.out.println ("Enter your initial investment amount: ");
    	  principal = reader.nextDouble();
     
     
         System.out.println ("Enter the number of years: ");
    	 years = reader.nextInt();
     
     
    	 System.out.println ("Enter the interst rate: ");
    	 rate = reader.nextDouble();
     
         years = reader.nextInt();
         System.out.printf("%4s%8s%10s%12s%n", "Years", "Principal", "Total", "Gain" );
         while (yearCount <= years)
         {
    		 gain = principal * (1 + rate / 400);
    		 total = principal + gain;
    		 System.out.printf("%4d%8f%10f%12f%n",years, principal, total, gain);
    	   total= (rate*years)*principal;
    	   yearCount++;
    	   }
    	   {
    	   	     System.out.print("your total investment is:" + total);
       }
       }
    }

  7. #6
    Think of me.... Mr.777's Avatar
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    Default Re: Help please!

    1. Why are you taking years as input twice?
    2. There are some problems with your formatting size and type.
    3. You must look it more carefully.

  8. The Following User Says Thank You to Mr.777 For This Useful Post:

    cindisue (March 30th, 2011)

  9. #7
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    Default Re: Help please!

    The 2nd years was commented out and I forgot to delete it before I pasted the code, but I changed the format and am now getting a display thanks!