Programming Forums > Application Development > Java

Alache · Apr 18th, 2006, 10:33 PM

Hi, I'm having some trouble with a java assignment. Can someone help me out plz: emergency!
here's the problem:

[i]Write a program that reads numbers from the keyboard into an array of type int[]. You may assume that there will be 50 or fewer entries in the array. Your program allows any number of numbers to be entered up to 50 numbers. The output is to be a two-column list. The first column is a list of the distinct array elements; the second column is the count of the number of occurrences of eahe element. The list should be sorted on entries in the first column, largest to smallest.

thanks!

Mjordan2nd · Apr 18th, 2006, 10:41 PM

What have you got so far?

Jessehk · Apr 18th, 2006, 10:43 PM

Please attempt to atleast produce a general idea of what to do (psuedo-code) to solve the problem.

People will not take their time to do your homework, despite what you may think.

If you have a specific question about the assignment, then perhaps an individual will be more inclined to help you out.

Alache · Apr 19th, 2006, 12:35 AM

Sorry for not being precise enough; this is what i got so far; i plan to do the main method last, I did the input method, but i'm stuck on the creation of the list.

(Toggle Plain Text)

import java.util.Scanner;
public class ArrayProg 
{
	public static final int Max_Entries = 50;
	private static int[] entries = new int[Max_Entries];
	
	public static void main (String[] args)
	{
		
	}
	public static int fillArray()
	{
		System.out.print("Enter up to " + entries.length + " non decimal number: ");
		Scanner keyboard = new Scanner(System.in);
		int index = 0;
		int next = keyboard.nextInt();
		while (index < entries.length)
		{
			
			entries [index] = next;
			index++;
			next = keyboard.nextInt();
		}
	return index;
	}
	public static int createList()
	{
		
	}
}

Mjordan2nd · Apr 19th, 2006, 12:44 AM

Please use code-tags next time.

Also, what I would do is have a method like this:

(Toggle Plain Text)

public static void method()
{
	 for(int i = 0; i<entries.length; i++)
	 {
		  // if entries[i] = any of the elements before it then 
				 //continue
		  int counter = 1;
		  for(int j = i; k<entries.length; j++)
		  {
				// if entries[j] is the same as entries[i] add 1 to counter
		  }
		  // print entries[i] and then counter
	 }
}

That would be the way I'd go.

ReggaetonKing · Apr 19th, 2006, 2:11 AM

Good point MJ, I was going to suggest the same but then I read your post and it looks like you got it under control.

"for" loops are better for assigning arrays their values in a consecutive way.

Apr 18th, 2006, 10:33 PM	#1
Alache Newbie Join Date: Apr 2006 Posts: 2 Rep Power: 0	Java arrays - help! Hi, I'm having some trouble with a java assignment. Can someone help me out plz: emergency! here's the problem: [i]Write a program that reads numbers from the keyboard into an array of type int[]. You may assume that there will be 50 or fewer entries in the array. Your program allows any number of numbers to be entered up to 50 numbers. The output is to be a two-column list. The first column is a list of the distinct array elements; the second column is the count of the number of occurrences of eahe element. The list should be sorted on entries in the first column, largest to smallest. thanks!

Apr 18th, 2006, 10:41 PM	#2
Mjordan2nd The Supreme Ruler Join Date: May 2004 Location: Houston Posts: 1,476 Rep Power: 6	What have you got so far? __________________ "Every gun that is made, every warship launched, every rocket signifies, in the final sense, a theft from those who hunger and are not fed, from those who are cold and are not clothed. The world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children." - Dwight D. Eisenhower

Apr 18th, 2006, 10:43 PM	#3
Jessehk The Oblivious One Join Date: May 2005 Location: Ontario, Canada Posts: 648 Rep Power: 4	Please attempt to atleast produce a general idea of what to do (psuedo-code) to solve the problem. People will not take their time to do your homework, despite what you may think. If you have a specific question about the assignment, then perhaps an individual will be more inclined to help you out. __________________ Dr. Zoidberg: [ecstatic] I'm going to a movie... with FRIENDS!

Apr 19th, 2006, 12:35 AM	#4
Alache Newbie Join Date: Apr 2006 Posts: 2 Rep Power: 0	Sorry for not being precise enough; this is what i got so far; i plan to do the main method last, I did the input method, but i'm stuck on the creation of the list. (Toggle Plain Text) import java.util.Scanner; public class ArrayProg { public static final int Max_Entries = 50; private static int[] entries = new int[Max_Entries]; public static void main (String[] args) { } public static int fillArray() { System.out.print("Enter up to " + entries.length + " non decimal number: "); Scanner keyboard = new Scanner(System.in); int index = 0; int next = keyboard.nextInt(); while (index < entries.length) { entries [index] = next; index++; next = keyboard.nextInt(); } return index; } public static int createList() { } } import java.util.Scanner; public class ArrayProg { public static final int Max_Entries = 50; private static int[] entries = new int[Max_Entries]; public static void main (String[] args) { } public static int fillArray() { System.out.print("Enter up to " + entries.length + " non decimal number: "); Scanner keyboard = new Scanner(System.in); int index = 0; int next = keyboard.nextInt(); while (index < entries.length) { entries [index] = next; index++; next = keyboard.nextInt(); } return index; } public static int createList() { } } Last edited by Mjordan2nd; Apr 19th, 2006 at 12:36 AM. Reason: Code Tags

Apr 19th, 2006, 12:44 AM	#5
Mjordan2nd The Supreme Ruler Join Date: May 2004 Location: Houston Posts: 1,476 Rep Power: 6	Please use code-tags next time. Also, what I would do is have a method like this: (Toggle Plain Text) public static void method() { for(int i = 0; i<entries.length; i++) { // if entries[i] = any of the elements before it then //continue int counter = 1; for(int j = i; k<entries.length; j++) { // if entries[j] is the same as entries[i] add 1 to counter } // print entries[i] and then counter } } public static void method() { for(int i = 0; i<entries.length; i++) { // if entries[i] = any of the elements before it then //continue int counter = 1; for(int j = i; k<entries.length; j++) { // if entries[j] is the same as entries[i] add 1 to counter } // print entries[i] and then counter } } That would be the way I'd go. __________________ "Every gun that is made, every warship launched, every rocket signifies, in the final sense, a theft from those who hunger and are not fed, from those who are cold and are not clothed. The world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children." - Dwight D. Eisenhower Last edited by Mjordan2nd; Apr 19th, 2006 at 7:55 AM.

Apr 19th, 2006, 2:11 AM	#6
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 4	Good point MJ, I was going to suggest the same but then I read your post and it looks like you got it under control. "for" loops are better for assigning arrays their values in a consecutive way. __________________ I would love to change the world, but they won't give me the source code!

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Programming Forums > Application Development > Java

Java arrays - help!