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Thread: Trouble with Arrays

  1. #1
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    Default Trouble with Arrays

    I am trying to complete a program which takes in user input for 6 locations along with donation amounts for each. I then need to print out the site location with the largest cash donation. I figured out how to print out the actual dollar amount, but how do I code to see what the site with that amount is? Here is what I have:

     
    import java.util.Scanner; 
     
    public class Asg06 { 
     
    		static double [] cashDonations = new double[6];  
    		static double [] lbsFood = new double[6];  
    		static String [] siteName = new String[6];  
    		static String bestSiteCash = " ";  
    		static String bestSiteFood = " ";  
    		static double totalCash = 0;  
    		static double totalFood = 0;  
    		static double maxFood = 0;  
    		static double maxCash = 0;  
     
    	public static void main(String[] args) {
     
    		Scanner input = new Scanner(System.in); 
    		String anotherCourse = "yes";
    		do {
     
    			getDonations();
    			processDonations();
    			displayDonations();			
     
    			System.out.print("Enter yes if you want to run again: ");
    			anotherCourse = input.next();
    			System.out.print("\n\n\n");
    		} while (anotherCourse.equalsIgnoreCase("yes"));
     
    	} // end of main
     
    	public static void getDonations()
    	{
    		Scanner input = new Scanner(System.in); //needed for input
    		for (int i = 0; i < siteName.length; i++)
    		{
    			System.out.println("Enter site location name: ");
    			siteName[i] = input.next();
    			input.nextLine();
    			System.out.println("");
    			do{
    			System.out.println("Enter cash donations for " + siteName[i] + " ");
    			cashDonations[i] = input.nextDouble();
    			if(cashDonations[i] < 0)
    			{
    				System.out.println("ERROR---Please Enter Only Positive Numbers!!!");
    			}//end if
    			System.out.println("");
    			}while(cashDonations[i] < 0);//end while
     
    			do{
    			System.out.println("Enter lbs of food donations for " +siteName[i] + " ");
    			lbsFood[i] = input.nextDouble();
    			if(lbsFood[i] < 0)
    			{
    				System.out.println("ERROR---Please Enter Only Positive Numbers!!!");
    			}//end if
    			System.out.println("");
    			}while(lbsFood[i] < 0 );//end while
    			}//end of for 
     
    	} //end of getDonations()
     
    	public static void processDonations()
    	{
    		maxCash = cashDonations[0];
    		maxFood = lbsFood[0];
     
    		totalCash = 0;
    		totalFood = 0;
    		for(int i = 0; i < siteName.length; i++)
    		{
    			totalCash = totalCash + cashDonations[i];
    			totalFood = totalFood + lbsFood[i];
    		}
     
    		for (int i = 0; i < cashDonations.length; i ++)
    		{
    			if (cashDonations[i] > maxCash)
    				maxCash = cashDonations[i];
    		}//end of for loop
     
    		for (int i = 0; i < lbsFood.length; i ++)
    		{
    			if (lbsFood[i] > maxFood)
    				maxFood = lbsFood[i];
    		}//end of for loop
     
    	}//end of processDonations()
     
    	public static void displayDonations()
    	{
    		System.out.println("Holiday Donation Locations Report");
    		System.out.println("---------------------------------");
    		System.out.println("");
    		for(int i = 0; i < siteName.length; i++){
    		System.out.println("Site: " + siteName[i]);
    		System.out.println("Individual Cash Donations " + cashDonations[i]);
    		System.out.println("Individual Food Donations " + lbsFood[i]);
    		System.out.print("\n\n");
    		}//end of for
    		System.out.println("");
    		System.out.println("Holiday Donation Totals Report");
    		System.out.println("------------------------------");
    		System.out.println("");
    		System.out.printf("Total Cash Donations $%.2f\n", totalCash);
    		System.out.printf("Total Food Donations %.2f lbs\n", totalFood);
    		System.out.println("\n\n");
    		System.out.println("Holiday Donation Best Site Report");
    		System.out.println("---------------------------------");
    		System.out.println("");
    		System.out.println("Best Location For Cash Donation: " + bestSiteCash);
    		System.out.printf("Max Cash Collected Was: $%.2f\n ", maxCash );
    		System.out.println("");
    		System.out.println("Best Location For Food Donation: " + bestSiteFood);
    		System.out.printf("Max Food Collectd Was: %.2f lbs\n ", maxFood );
    		System.out.println("");
     
    	}//end of displayDonations()
     
    }// end of class

    Thanks for your help!
    Last edited by darren102; February 27th, 2014 at 07:06 PM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Trouble with Arrays

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.

    If you are using parallel arrays, when you find the index in one array for the amount, that same array can be used to get the location from the other array.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Trouble with Arrays

    I guess I do not understand how to do that. All of the code I try to do what you said gives me an error due to one being a string (siteName) and the other being a double (maxCash).

  4. #4
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    Default Re: Trouble with Arrays

    gives me an error
    Please copy the full text of the error message and paste it here. Also post the code that gives the error.

    When the code finds a value it wants to save in one array, it needs to save the array's index for that value to use to access the other array.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Trouble with Arrays

    Incompatible operand types String and double
    for (int i = 0; i < cashDonations.length; i ++)
    		{
    			if (siteName[i] == cashDonations[i])
     
    		}

  6. #6
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    Default Re: Trouble with Arrays

    if (siteName[i] == cashDonations[i])
    What is the purpose of that comparison?

    Did the code in post#1 work? Did it find the max value in one array?
    Can it save the index to that max value so it can use that index in the second array?
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Trouble with Arrays

    Yes, the code works in post#1. Yes, it did find the max value in one array. I guess if it can, I do not know how.

  8. #8
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    Default Re: Trouble with Arrays

    Take the code in post#1 and change it to save the index into the array where the value that is stored into the max value came from. Every time max is changed, save the index. At the end of the loop, max will have the largest value and the saved index will be the location in the array where max came from.
    If you don't understand my answer, don't ignore it, ask a question.

  9. #9
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    Default Re: Trouble with Arrays

    ok. one sec.

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