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Trying to get the right wording in an array.

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Trying to get the right wording in an array.

Mariko1222	30 Jun, 2009 - 05:16 PM Post #1
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	CODE public class Prices { public static void main(String[] args) { Okay, now would I use... int[] list = new int []; and what wording would I use to list each of the twenty prices? Should I put them in parenthesis? int [] list = {2.34, 7.89, 1.39, 8.99, etc......}? or is there another way to do it? Please understand that I am trying to write the code, but if you don't understand how to word it, it's difficult to try. I think with some guidence I can learn this and get through it. Mary
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virgul	RE: Trying To Get The Right Wording In An Array. 30 Jun, 2009 - 06:14 PM Post #2
D.I.C Head Joined: 18 Mar, 2009 Posts: 178 Thanked: 13 times My Contributions	ok not 100% sure what you mean so ill give you a few examples of what you can do. note that you would need to say double in order for this to work, because you have a decimal CODE //1 double[] list = new double[20]; //2 double[] list = {23.23., 34.23, 8.3, 5, 23 ....}; //3 - not sure what you need this for so this might apply to you. double[] list; //then in your constructor you can have list = new double[20]; //or list = new double[size]; hope this helps.
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pbl	RE: Trying To Get The Right Wording In An Array. 30 Jun, 2009 - 06:26 PM Post #3
Java Lover Joined: 6 Mar, 2008 Posts: 9,535 Thanked: 1125 times Dream Kudos: 450 My Contributions	Virgul statements also apply to int as your first intention seemed to be int[] list = new int[20]; int[] list = {1, 2, 3}; int[] list; list = new int[10];
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Fuzzyness	RE: Trying To Get The Right Wording In An Array. 30 Jun, 2009 - 08:26 PM Post #4
Comp Sci Student Joined: 6 Mar, 2009 Posts: 1,145 Thanked: 172 times Dream Kudos: 150 My Contributions	Indeed they would apply the same way however what Virgul was saying I think is that because she is using Prices - possible decimals. She needs to use an double.
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pbl	RE: Trying To Get The Right Wording In An Array. 30 Jun, 2009 - 08:33 PM Post #5
Java Lover Joined: 6 Mar, 2008 Posts: 9,535 Thanked: 1125 times Dream Kudos: 450 My Contributions	Ya but the first post said Okay, now would I use... int[] list = new int []; whatever... I guess both explanations where clear
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cfoley	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 04:37 AM Post #6
D.I.C Addict Joined: 11 Dec, 2007 Posts: 645 Thanked: 60 times Dream Kudos: 25 My Contributions	One more... if you have already declared the array: int[] list; This will not compile: list = {1, 2, 3, 4, 5}; because you can only use the curly bracket notation when you create the array. In this case you can: list = new int[]{1, 2, 3, 4, 5}; You probably won't find this useful right now but keep it in the back of your mind for when you are working with classes and objects. This post has been edited by cfoley: 1 Jul, 2009 - 04:38 AM
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Mariko1222	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 05:13 PM Post #7
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	Been working on this all day. I came up with some more, am I correct so far? CODE public class Prices { public static void main(String[] args) { double[] list={2.34, 7.89, 1.34, 8.99, 6.99, 12.50, 5.75, 6.23, 8.54, 7.23, 9.54, 13.83, 1.49, 2.63, 4.27, 3.42, 5.12, 4.69, 9.62, 15.47}; list= new double[20]; System.out.println(prices[]); } } Now, my next step is to get this to add all those numbers together and print out the total...OR AM I WRONG??? would I now use the CODE for(int i=0; i<20; i ++){ num[i] = in.nextDouble(); } for (int i=0; i<20; i ++){ average=average + num [i]; }System.out.println(average/20); The second "for" method is to find the average of all the prices. IS IT CORRECT????? Would I repead the "for" and average lines again with an i<5.00 As you can see, I'm trying, but I need help!! Thanks in advance. Mary
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pbl	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 05:23 PM Post #8
Java Lover Joined: 6 Mar, 2008 Posts: 9,535 Thanked: 1125 times Dream Kudos: 450 My Contributions	CODE double total = 0.0; for(int i = 0; i < list.length; i++) total = total + list[i]; double average = total / list.length;
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Mariko1222	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 05:59 PM Post #9
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	QUOTE(pbl @ 1 Jul, 2009 - 05:23 PM) CODE double total = 0.0; for(int i = 0; i < list.length; i++) total = total + list[i]; double average = total / list.length; Did I get the other coding right so far?I'm trying desparetly to get this right. so, I replace my two "for" methods with the one you provided, correct???
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pbl	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 06:20 PM Post #10
Java Lover Joined: 6 Mar, 2008 Posts: 9,535 Thanked: 1125 times Dream Kudos: 450 My Contributions	QUOTE(Mariko1222 @ 1 Jul, 2009 - 05:59 PM) so, I replace my two "for" methods with the one you provided, correct??? seems logic to me
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virgul	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 06:41 PM Post #11
D.I.C Head Joined: 18 Mar, 2009 Posts: 178 Thanked: 13 times My Contributions	you dont need this part CODE list= new double[20]; also im not sure that doing this will work CODE System.out.println(prices[]); seeing as you dont have an array named prices, you have one named list. I think your code (so far) should look like this CODE public class Prices { public static void main(String[] args) { double[] list={2.34, 7.89, 1.34, 8.99, 6.99, 12.50, 5.75, 6.23, 8.54, 7.23, 9.54, 13.83, 1.49, 2.63, 4.27, 3.42, 5.12, 4.69, 9.62, 15.47}; //this is to print out all the values in list for(int i = 0; i < list.length; i++) System.out.println(list[i]); } } then you can add your code. Not sure if you wanted to print all that was in list though, thats your choice ;D
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slydunan	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 07:40 PM Post #12
New D.I.C Head Joined: 1 Jul, 2009 Posts: 3	but it needs to find the average doesn't it? [code] public class Prices {
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slydunan	RE: Trying To Get The Right Wording In An Array. 1 Jul, 2009 - 07:50 PM Post #13
New D.I.C Head Joined: 1 Jul, 2009 Posts: 3	but it needs to find the average doesn't it? CODE public class Prices { public static void main(String[] args) { double[] list={2.34, 7.89, 1.34, 8.99, 6.99, 12.50, 5.75, 6.23, 8.54, 7.23, 9.54, 13.83, 1.49, 2.63, 4.27, 3.42, 5.12, 4.69, 9.62, 15.47}; //find the average (pbl's code) double total = 0.0; for(int i = 0; i < list.length; i++){ total = total + list[i]; } double average = total / list.length; //print average System.out.println(average); //if you need to print the whole list, then virgul's code for(int i = 0; i < list.length; i++){ System.out.println(list[i]); } } }
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Mariko1222	RE: Trying To Get The Right Wording In An Array. 2 Jul, 2009 - 03:57 AM Post #14
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	Don't suppose that I need to print the whole list, just want it to show the average. Okay, next I want it to print out those prices that are below the 5.00. How would I word this? it's coming.....
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slydunan	RE: Trying To Get The Right Wording In An Array. 2 Jul, 2009 - 08:20 AM Post #15
New D.I.C Head Joined: 1 Jul, 2009 Posts: 3	I don't know if you're still finding the average, or if you just want to print out the numbers. The concept is to just add an if statement (or more if needed), such as this: CODE if(list[i]<5.00) /write whatever you need to do here when list[i] is less than 5.00/; ill let you figure out where to put this for yourself
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Mariko1222	RE: Trying To Get The Right Wording In An Array. 2 Jul, 2009 - 06:23 PM Post #16
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	It's me again! Getting sick of me? Hope not. Here is what I've got....I'm still getting errors when I compile. CODE import javax.swing.; import java.util.; public class Prices { public static void main(String[] args) { double[] prices = {2.34,7.89, 1.34, 8.99, 6.99, 12.50, 5.75, 6.23, 8.54, 7.23, 9.54, 13.83, 1.49, 2.63, 4.27, 3.42, 5.12, 4.69, 9.62, 15.47}; double total=0.0; for(int i=0; i<prices.length; i++) { total=total + prices[i]; } double average = total/price.length; System.out.println(average); if(prices[i]<5.00); System.out.println(prices); } } Here are the errors I keep getting. Copyright © 2006 Microsoft Corporation. All rights reserved. C:\Java Working Directory>javac Prices.java Prices.java:13: cannot find symbol symbol : variable price location: class Prices double average = total/price.length; ^ Prices.java:15: cannot find symbol symbol : variable i location: class Prices if(prices[i]<5.00); ^ 2 errors I've made corrections, but I'm still not getting it to compile. I also can get it to print out the values that are higher than the average. HELP! My next class is applets, and so far, I understand that! Thanks again, Mary
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pbl	RE: Trying To Get The Right Wording In An Array. 2 Jul, 2009 - 06:35 PM Post #17
Java Lover Joined: 6 Mar, 2008 Posts: 9,535 Thanked: 1125 times Dream Kudos: 450 My Contributions	double average = total/price.length; should be prices.length with an S if(prices[i]<5.00); which i i does not exist out of the previous loop
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Mariko1222	RE: Trying To Get The Right Wording In An Array. 3 Jul, 2009 - 04:03 AM Post #18
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	QUOTE(pbl @ 2 Jul, 2009 - 06:35 PM) if(prices[i]<5.00); which i i does not exist out of the previous loop Okay, that what should it be if not i? How do I get it to print out the prices that are higher than the average?
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pbl	RE: Trying To Get The Right Wording In An Array. 3 Jul, 2009 - 01:00 PM Post #19
Java Lover Joined: 6 Mar, 2008 Posts: 9,535 Thanked: 1125 times Dream Kudos: 450 My Contributions	When your Average is calculated perform another for() loop and prints the prices[i] higher than average
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Mariko1222	RE: Trying To Get The Right Wording In An Array. 3 Jul, 2009 - 02:15 PM Post #20
New D.I.C Head Joined: 19 Jun, 2009 Posts: 41	QUOTE(pbl @ 3 Jul, 2009 - 01:00 PM) When your Average is calculated perform another for() loop and prints the prices[i] higher than average okay, a few NEW problems..... 1] It makes a line each time it adds another number...is this okay? 2] It won't let me say anything, it just prints the average. 3] It won't show the values less than 5.oo 4] It won't printout the calculated average. So once again, here is my current coding... CODE import javax.swing.; import java.util.; public class Prices { public static void main(String[] args) { double[] prices = {2.34,7.89, 1.34, 8.99, 6.99, 12.50, 5.75, 6.23, 8.54, 7.23, 9.54, 13.83, 1.49, 2.63, 4.27, 3.42, 5.12, 4.69, 9.62, 15.47}; double total=0.0; for(int i=0; i<prices.length; i++) { total=total + prices[i]; System.out.println("The sum of the prices are: " + total); } double average = total/prices.length; System.out.println(average); } }
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