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Thread: Help with Java code,

  1. #1
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    Default Help with Java code,

    Write a program that stores the total rainfall for each of 12 months into an array of doubles. The program should have methods that return the following:

    the total rainfall for the year.
    the average monthly rainfall.
    the month with the most rain.
    the month with the least rain.

    Here's my code so far.

    import java.util.Scanner;		//Needed for Scanner class.
     
    public class Rainfall
    {
    	public static void main(String[] args)
    	{
    		double[] months = new double[12];
    		double[] rainfall = new double[12];
     
    		Scanner scn = new Scanner(System.in);
     
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			System.out.print("rainfall for month #" + (index + 1) + ": ");
    			rainfall[index] = scn.nextDouble();
    		}
     
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			TotalRainfall(rainfall[index]);
    			Average(rainfall[index]);
    			Most(rainfall[index]);
    			Least(rainfall[index]);
    		}
    	}
     
    	public static void TotalRain(double rainfall)
    	{
    		double total = 0;
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			total += rainfall[index];
    		}
    		System.out.print("Total rainfall is: " + total);
    	}
     
    	public static double Avrge(double rainfall)
    	{
    		double total = 0;
    		double average;
     
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			total += rainfall;
    		}
    		average = total / rainfall.length;
     
    		System.out.println("average monthly rainfall is: " + average);
    	}
     
    	public static double Most(double rainfall)
    	{
    		int highest = rainfall[0];
    		int month;
    		for (int index = 1; index < rainfall.length; index++)
    		{
    			if (rainfall[index] > highest)
    				{
    					highest = rainfall[index];
    					month = index;
    				}
    		}
     
    		System.out.println("Highest rain happened during month #" + month);
    	}
    	public static double Least(double rainfall)
    	{
    		int lowest = rainfall[0];
    		int month;
    		for (int index = 1; index < rainfall.length; index++)
    		{
    			if (rainfall[index] < lowest)
    			{
    				lowest = rainfall[index];
    				month = index;
    			}
    		}
     
    		System.out.println("Least rain happened during month #" + month);
    	}
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Help with Java code,

    Please post any questions or problems you are having?
    If there are errors, copy the full text of the messages and post them.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Help with Java code,

    Quote Originally Posted by Norm View Post
    Please post any questions or problems you are having?
    If there are errors, copy the full text of the messages and post them.
    C:\Users\PSY\Desktop\Rainfall.java:38: error: double cannot be dereferenced
    for (int index = 0; index < rainfall.length; index++)
    ^
    C:\Users\PSY\Desktop\Rainfall.java:40: error: array required, but double found
    total += rainfall[index];
    ^
    C:\Users\PSY\Desktop\Rainfall.java:50: error: double cannot be dereferenced
    for (int index = 0; index < rainfall.length; index++)
    ^
    C:\Users\PSY\Desktop\Rainfall.java:54: error: double cannot be dereferenced
    average = total / rainfall.length;
    ^
    C:\Users\PSY\Desktop\Rainfall.java:61: error: array required, but double found
    int highest = rainfall[0];
    ^
    C:\Users\PSY\Desktop\Rainfall.java:63: error: double cannot be dereferenced
    for (int index = 1; index < rainfall.length; index++)
    ^
    C:\Users\PSY\Desktop\Rainfall.java:65: error: array required, but double found
    if (rainfall[index] > highest)
    ^
    C:\Users\PSY\Desktop\Rainfall.java:67: error: array required, but double found
    highest = rainfall[index];
    ^
    C:\Users\PSY\Desktop\Rainfall.java:76: error: array required, but double found
    int lowest = rainfall[0];
    ^
    C:\Users\PSY\Desktop\Rainfall.java:78: error: double cannot be dereferenced
    for (int index = 1; index < rainfall.length; index++)
    ^
    C:\Users\PSY\Desktop\Rainfall.java:80: error: array required, but double found
    if (rainfall[index] < lowest)
    ^
    C:\Users\PSY\Desktop\Rainfall.java:82: error: array required, but double found
    lowest = rainfall[index];
    ^
    12 errors

    Tool completed with exit code 1


    I'm using Textpad and these are the errors.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Help with Java code,

    The code has two definitions for the variable: rainfall. One is an array and one is a double.
    rainfall.length
    and
    rainfall[0];
    are not valid for a double. Those statements are for arrays.


    You should change one of the names so it is different. Compile the code after changing one of them and that should get rid of some of the error messages
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Help with Java code,

    That really helped!

    Although, I got the program to compile correctly, I'm having a logical error.

    I can't get the program to grab which month had the most and least rain.

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Help with Java code,

    which month had the most and least rain
    That will take a search through the data to find the most and least values.

    What does the program output now as a result of these searches? Post the current code to show what it is doing.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Help with Java code,

    public static void main(String[] args)
    	{
    		double[] months = new double[12];
    		double[] rainfall = new double[12];
     
     
     
    		Scanner keyboard = new Scanner(System.in);
     
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			System.out.print("Enter rainfall for month #" + (index + 1) + ": ");
    			rainfall[index] = keyboard.nextDouble();
    		}
     
    			TotalRainfall(rainfall);
     
    			Average(rainfall);
     
    			Most(rainfall, months);
     
    			Least(rainfall, months);
    	}
     
    	public static void TotalRainfall(double[] rainfall)
    	{
    		double total = 0;
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			total += rainfall[index];
    		}
    		System.out.printf("\ntotal rainfall of the year is: %.1f" , total);
    	}
     
    	public static void Average(double[] rainfall)
    	{
    		double total = 0;
    		double average;
     
    		for (int index = 0; index < rainfall.length; index++)
    		{
    			total += rainfall[index];
    		}
    		average = total / rainfall.length;
     
    		System.out.printf("\naverage monthly rainfall is: %.1f" , average);
    	}
     
    	public static void Most(double[] rainfall, double[] months)
    	{
    		double highest = rainfall[0];
    		double month;
     
    		for (int index = 1; index < rainfall.length; index++)
    		{
    			if (rainfall[index] > highest)
    				{
    					month = months[index];
    				}
    		}
    			System.out.println("\nmonth with the most rain is " + month);
    	}
    	public static void Least(double[] rainfall, double[] months)
    	{
    		double lowest = 0;
    		int month=0;
    		for (int index = 1; index < rainfall.length; index++)
    		{
    			if (rainfall[index] < lowest)
    			{
    				lowest = rainfall[index];
    				month = index;
    			}
    		}
     
    		System.out.println("month with the least rain" + month);
    	}
    }

    The output is perfectly fine.

    When it comes to the most and least rain, it always shows month as month #0

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: Help with Java code,

    Try debugging the code by adding some println statements that print out the values of variables as the code executes so you can see what the computer sees as it executes the code.
    Print out the contents of the rainfall array so you can see what data it is working with. Use the Arrays class's toString() method to format the array for printing:
    System.out.println("an ID "+ java.util.Arrays.toString(theArrayName));
    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: Help with Java code,

    I got it all done!

    Basically what I did was, I changed the months to String variables and I could return it just perfectly!

    Thank you Norm for you help,
    Truly appreciated!

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