Include Three Sides Of Triangle Formatted To Two Decimal Places
Sep 9, 2014
My program is supposed to include The three sides of the triangle formatted to two decimal places The perimeter formatted to one decimal place The area formatted to one decimal place The unformatted area. It does run, but it is not decimal formatted. I have read my book to try and figure out how to do this, but it doesn't make since to me.
I had to make a program that allows the user to enter 3 sides and it should output "invalid" if it does not make a triangle and if it does make a triangle it calculates the area of the triangle and it doesnt seem to do anything but say "invalid" as the out put.
import java.util.Scanner; public class MyTriangle { public static void main(String[] args) { Scanner input = new Scanner(System.in); boolean valid = true; double side1, side2, side3, area, A;
import javax.swing.JOptionPane; import java.text.DecimalFormat; public class Sample3 { public static void main(String args[]){ double amount,iRate,monPay,totalPay; int years; String amountStr;
I've been scanning forums for answers to this problem, but most deal with simple programming that you might find in a classroom (i.e. "System.out.printf") which will not work in the GUI I'm attempting to complete. Here's the tale of the tape:
The GUI is a price calculator I'm developing for my company that takes input from drop-down menus and several Jtextfields and calculates the answer based on the values contained within each. It's completely done (and functional), so I'd rather not change too much if at all possible. Because I'm dealing with decimal values then I'm getting 9 decimal places in the output JLabel, though. In order to display the answer, I'm using a series of "totalPrice.setText(..." declarations.
Because there is a fair amount of text and the values in the calculation are constantly changing, is there a way to 'simply' format the output JLabel to display only 2 decimals? Or is there an alternative solution that would work--say with a JTextfield instead--without having to completely re-code the calculator?
I am writing a simple learning program that does basic math. Everything is working as needed except for when it comes to division. I need to know if there is a way to format the users input to two decimal places and that when the program checks the users answer against the division, it gives it a yay or nay. Right now, it wants the answer out to 12 decimal places.
I need to print to 2 decimal places and I'm trying to use the printf method, but for some reason I keep getting an error. I've looked through my code, but unless I'm missing a small detail, it looks okay to me.
I am working with a program I wrote for class. I got it to compile and do what I want, But I was wondering how I can format my methods to to display a decimal with 1-2 decimal places. Would I create a method in my NumberAnalysis class to do it for me? Or would I declare an instance of the DecimalFormat class in my main method?
import java.util.Scanner; //Needed for Scanner Class import java.io.*; //Need for File and IOException import java.text.DecimalFormat; public class Ex8_11 { public static void main(String[] args) throws IOException{ { DecimalFormat decformatter = new DecimalFormat("#0.00");
[Code] .....
This is my output:
Lowest Number: 1.09 Highest Number: 82.76 Total Number: 367.89000000000004 Total Average Number: 30.657500000000002
Think I just solved the answer to my own question, I did it by declaring double variables in my main method and called the methods and instantiated the variables into the methods... Is there a better way to do this?
package lesson4.skowronek; import java.util.Scanner; //Needed for Scanner Class import java.io.*; //Need for File and IOException import java.text.DecimalFormat; public class Ex8_11 { public static void main(String[] args) throws IOException{
I'm attempting to format my doubles to two decimal places within my return statement. I have tried to use DecimalFormat but it gives me an error because my method needs to return a double and that results in a string being returned. I have also tried using the *100.00/100.00 method and that doesn't work when the number already ends in 0.
If I pass -150.00 it gives me -150.0 when I need two decimal places.
How i would convert this java code to display using the printf statement, with two decimal places to the right...here is the source code so far, but it has a few errors and needs to be reformated for printf
import java.util.Scanner; // scanner class public class PROB3_CHAL15 { public static void main(String[] args) { double checks =0, totalfee =0, fee = 10, fee1 =.1, fee2 = .08, fee3 = .06, fee4 = .04, checkFee; String input; Scanner keyboard = new Scanner(System.in);
import javax.swing.JOptionPane; import java.util.*; import java.text.DecimalFormat; import java.util.StringTokenizer; public class ShelbyHarms_3_03 { public static void main (String [] args) { double a, b, c; //Input sides of triangle double x; //Perimeter of triangle double area; //Area of triangle
[Code] .....
Here are the errors:
ShelbyHarms_3_03.java:39: error: variable x might not have been initialized JOptionPane.showMessageDialog(null, formatter.format(x)); ^ ShelbyHarms_3_03.java:42: error: variable area might not have been initialized JOptionPane.showMessageDialog(null, formatter.format(area)); ^ 2 errors
I'm doing a problem where the area of a triangle is returned (if valid). However, I want to return a message (i.e. 'triangle is not valid) if the triangle is invalid.
I'm not sure how to go about to doing this as my method (called area) will only let me return doubles. Possible to return a string in an else within my area method?
public class MyTriangle { public static void main(String[] args) { //triangle is valid if the sum of any two sides is bigger than the third System.out.println(isValid(3, 4, 5)); System.out.println(area(543, 4, 5));
I had to make a chart where it took miles 1-10 and convert it to kilometers and then on the other side it needs to show 25-65 (in 5's) kilometers to miles and I dont know how to switch the sides...
import java.util.Scanner; public class MilesAndKilos { public static void main(String[] args) { int miles; double kilometers=1.60934; System.out.println(" Miles Kilometers Kilometers Miles"); for(miles=1;miles<10;miles++){ kilometers = miles * 1.60934; System.out.printf(" %2d %8.3f | ", miles,kilometers); } }//end of main method }
I have this really a graphics program that I'm working on which displays a single die, and right now it is set to the default 6 sides. I need to change it to 12. Here is the program:
What are formatted input & output in Java? I want to know the difference between general "input & output" & "formatted input & output"? And what is the reason of the naming it as formatted.
If I use the class DecimalFormat to format long number, how can I convert it back to integer?
DecimalFormat longFormat = new DecimalFormat("#,###"); long testLong=11000; String strLong=longFormat.format(testLong); System.out.println("NUM : " + strLong); //Assume that at this point I don't have //testLong, I have only the strLong value... long newLong=Long.parseLong(strLong) * 2; //java.lang.NumberFormatException: For input string: "11,000
Our users want us to build the following ontop of a TableView: When a key was typed, the row selection shall change to the first row showing a cell in a given column whose getText() starts with the typed letter. Such a functionality is known from lots of other software, like the Windows file explorer, where you can type a key to jump to the first file starting with that letter. It shouldn't be too complex to build, but due to the separation of "items" and "formatted cell text" it actually is... :-(
Using TableColumn.getCellData(S) we can access the item, but at that point, we don't want to repeat the formatting just for the sake of this functionality. We have set a cell factory providing this format, so the view looks great, but how can we access that formatted String programmatically to jump to the right row at a later time?
I'm using eclipse. I'm going to get straight to the point and give all the info I can, if the values in the first code box are used, shouldn't these values be left after all in the second box is done:
remainder=23, arr[0]=100, div=23/10=2.3, whole=2, and decimal=3?
When I use this code, div comes out to be just (2.0).
Java Code:
int leng=10; arr[0]=123; //int arr[1]=100; //int mh_sh_highlight_all('java'); Java Code: if (arr[0]!=arr[1]){ int remainder=arr[0]-arr[1]; arr[0]=arr[0]-remainder; double div=remainder/leng; //double div=Double.valueOf(remainder/leng); int whole=(int) Math.floor(div); int decimal=(int) ((div-whole)*leng); mh_sh_highlight_all('java');
I'm not sure were I'm going wrong in how div is being calculated, but I ultimately need div to be 2.3.
I've also used the second option commented out which still gives (2.0).
The basic gist is it's "A program that reads in a text file that uses a specific input format and uses it to produce a formatted report for output."
Specifically :"For this lab you will write a Java program that produces a simple formatted report. The program will prompt the user to enter a file name. This file must contain information in a specific format (detailed below). Each "block" of the file contains information for one player in a competition -- the name of the player followed by a number of different scores that that player achieved. The program should find each player's average score, median score and best and worst scores and display them in a line on the final summary report. The program should also determine which player has the highest average score and which player has the lowest average score."
I get the following errors when I try and compile it:
Enter an input file name: Project11.txt Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException... -1 at java.util.ArrayList.elementData(Unknown Source) at java.util.ArrayList.get(Unknown Source) at Project11.getMedian(Project11.java:68) at Project11.main(Project11.java:27)
I get that the error(s) reside in lines 68 and 27, among problem other areas, but I'm not exactly sure how I can fix them.
Here's my code:
import java.io.*; import java.util.*; public class Project11 { public static void main(String[] args) throws IOException{ Scanner in = new Scanner(System.in); System.out.print("Enter an input file name: "); String input = in.nextLine();
I am creating a very simple webpage where I am using just a little bit of JSP to include partials (header, footer and asides) that are centrally located. One of the constraint that the site owner has put is that, for SEO reason, he wants to keep the url's the way they are. Most of the pages are located in the same folder, except for one which is in a subfolder.
Here is my problem, I have the partials in a folder and at the same level the images. Now, for that page located in the subfolder, when I include the partials, it is not able to locate the images because they are located in a folder one level up. What I could do is create a copy of the image folder in the subfolder or an adapted copy of the partials (referring to the images one level up), but either solution would make for a maintenance nightmare and repeat information on the server.
Here is a visual representation of my file system:
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Note these utilities file i want use on JAVA desktop(swinf and javafx), on JSP webpages and in the futhurer on the mobile.
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