Arithmetic Expression That Will Display Doubles To Only One Decimal Place?
Sep 29, 2014I am looking to find a way to display the number of decimal places without using any type of formatting string.
Only to make it xxx.x instead of xxx.xxxxxx.
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How To Display Decimal Place With 100 Digits
Apr 21, 2015I am currently trying to solve a programming problem on this site, and the problem includes working on a 100 digits of decimal places of a certain irrational number. I tried using BigDecimal class but it displays, correctly me if I am wrong, just 20+ decimal digits. Is there other way to do this?
View Replies View RelatedFormatting Doubles To Two Decimal Places Within Return Statement
Jan 25, 2015I'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 can I go about doing this?
Arithmetic Expression With Quadratic Formula
Oct 3, 2014I have just started to learn programming in the book I am teaching myself from it said how would you write the following arithmetic expression with it being the quadratic formula but only the plus part of it in the plus or minus..
package javalearning;
import java.util.Scanner;
public class QuadraticFormula {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.print("Enter value for B: ");
double B = input.nextDouble();
System.out.print("Enter value for A: ");
double A = input.nextDouble();
System.out.print("Enter value for C: ");
double C = input.nextDouble();
double negativeOfB = -B;
[code]....
Calculating Arithmetic Expression - Recursive Function
Oct 26, 2014I have a given arithmetic expression, which form is (A+B) or (A-B), were A and B are either numbers from 0-9, or another ARITHMETIC Expression.
The first thing that comes to my mind is a recursive function, but how to start...
Converting Double Value To A 2 Decimal Place Value
Jan 28, 2015I am trying to convert the double grossPay to 2 decimal places but cannot get it to work ,I am unsure of the correct way of doing this but this is how far I can get
public static double grossPay(double Orate, double overtime, double salary) {
double grosspay = 0;
grosspay = (Orate * overtime) + (salary / 26);
DecimalFormat df = new DecimalFormat("#.##");
return(df.format(grosspay));
}//closes grossPay method
Unable To Get Value Out Of Double - It Only Extends To One Decimal Place
Oct 3, 2014I'm not sure why, but whenever I try to get a value out of a double, it only extends to one decimal place. For instance, (825 / 805) would become 1.0000 (after being run through a DecimalFormat object) instead of 1.0248 like I need it to be (and should be if what I know about primitive variable types is right). Why is the double variable type not giving me the precision I want and, more importantly, how do I fix this?
View Replies View RelatedJava Program - Distance Traveled (Formatting And Decimal Place)
Apr 10, 2014I'm having trouble formatting my output and issues with the decimal places. Here's my code:
import java.util.Scanner;
import java.text.DecimalFormat; // Imports DecimalFormat class for one way to round
public class lab3 {
public static void main(String[] args) {
String heading1 = "Hour", heading2 = "Distance Traveled";
int timeElapsed, hour, speed;
[Code] ....
And here's my output (Click on the image since it's pretty small):
javaIssues.png
Issue:
1) The Hours 2 and 3 aren't aligned to 1.
2) The 80 and 120 in Distance Traveled have 6 decimal places when it should not have decimals.
How To Write JAVA Program That Read Whole Number And Tell Decimal Place
Oct 10, 2014Ex. If I type 5943, the program will say
mill = 5
hun = 9
ten = 4
uni = 3
get the picture I had to translate the decimal value names from a different language.
This is what I have tried...,
Java Code:
import java.util.Scanner;//Permite el uso de leer el teclado del usuario
public class DeterminarValorDecimal//Nombra el documento
{
public static void main(String [] args)//Podemos ver la clase
{
[Code].....
But what this does is I have to enter the single digits one by one. I want to be able to type the whole number. Is there a method that reads the length of the whole number and lets me classify each digit so I can do what I want to do?
Display Decimal Numbers Only
Jul 6, 2014What code to use to display decimal numbers only. for example 125.50. the program will only display .50
View Replies View RelatedHow To Format Methods To Display Number With 1-2 Decimal Places
May 8, 2014I 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{
[Code] ....
Convert Java Code To Display Using Printf Statement With Two Decimal Places To Right
Feb 26, 2015How 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);
[code]...
Not Getting Decimal For Surely Decimal Answer?
Jan 1, 2015I'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).
Round Decimal Number Into 2 Decimal
Apr 2, 2014Here is my code and i want to convert number into 2 decimal but this code not give me result how to check my code.
import javax.swing.JOptionPane;
public class showtime{
public static void main(String[] args){
double total_mili=System.currentTimeMillis();
JOptionPane.showMessageDialog(null,total_mili, "Total milisecond",JOptionPane.INFORMATION_MESSAGE);
double seconds=total_mili/60;
double sec=(double)(seconds * 100) / 100.000;
JOptionPane.showMessageDialog(null,seconds, "Total Second",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,sec, "Total Second",JOptionPane.ERROR_MESSAGE);
}
}
Add Doubles In Array
Jan 20, 2014I'm allowing the user to choose certain items to buy that is moved to an array.Now I'm trying to add those thing in the array use a different class. how I can call the array from my driver class to my checkout class that adds them together.
View Replies View RelatedScanner Isn't Accepting Doubles
Jan 25, 2014I had to use scanner to receive input from the user for a formula and everything compiled and worked correctly except when I entered a double into the Scanner, it only accepts ints and gives me this error every time I enter a double:
java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextDouble(Unknown Source)
at TestA1Q2.main(TestA1Q2.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)
I know that you usually get that error when the Scanner expects something else that is different from what you type and I have looked over my code time and time again and cannot find anything. I created a test program to see if it was just that problem and not something else in the code and I still got the same error but when I tried compiling and running it here browxy.com everything worked and I got the right answer for the formula. Here's the test I used:
import java.util.Scanner;
public class TestA1Q2 {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a double");
double velocity = keyboard.nextDouble();
}
}
At this point I'm thinking it might be a problem with my install of DrJava and I've tried re-installing but nothing changed.
How To Add Doubles From A Text File
Apr 13, 2014I have a text file that looks like this:
JacobAndrews8159RoseCtMill CityOR97322555212787964.00
RyanPerkins7546PrinceAveLas VegasNV87126555345198913.00
JoshuaGilbert9278MonroeDrCorvallisCA97330555283265695.00
MilesCrain4578ChesterDrCorvallisOR9733155523456781544.00
ButchCassidy5498SuttonPlGresham AZ9738054165657971798.56
PerryWinkle8185ShaverAveLas VegasNV871265553812346195.66
everything is separated by tabs.
My while loop is like this:
while(fileScan.hasNextLine()) {
String currentLine = fileScan.nextLine();
String[]dataSet = currentLine.split(" ");
String zip = dataSet[7];
String phone = dataSet[8];
String donation = dataSet[9];
int ZIP = Integer.parseInt(zip);
Double Donation = Double.parseDouble(donation);
As you can see I made the donation read as a double, my question is how do I get the donation total? I need to write the code to add up and get the total donations but cannot figure it out.
How To Work With Doubles In Arrays
Sep 13, 2014import java.util.*;
public class OneDimenArray {
public static void main(String[] args) {
double[] decimals = new double[12];
double nums = 0.0;
double a = 1.0;
[Code] ....
These are the erroe codes I'm getting;
OneDimenArray.java:13: error: ']' expected
double[] decimals = double[Scanner.nextDouble()];
^
OneDimenArray.java:13: error: ';' expected
double[] decimals = double[Scanner.nextDouble()];
^
2 errors
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.
Floats / Doubles And Currency
Mar 8, 2014Just done a quick test to try and figure out the difference between floats and doubles.I made a quick program which outputs the result of 3.3 * 2 as both a float and a double.
I assumed since a float is the larger and more precise of the two data types that there would be more numbers after the decimal point, however this was not the case, it was in fact the double which had more numbers after the decimal point. Result was as follows:
Float: 29.699999
Double: 29.7
BTW for the above code I simply had a few text fields and a button with the following code:
Java Code:
textBox3.setText("" + Float.parseFloat(textBox1.getText()) * Float.parseFloat(textBox2.getText()));
textBox6.setText("" + Double.parseDouble(textBox1.getText()) * Double.parseDouble(textBox2.getText())); mh_sh_highlight_all('java');
Also, as these are limited to a certain amount of numbers im thinking there must be a more precise way for currency, if so what would I use for that? I suppose what im trying to figure out is what data type to use in different scenarios? When to use integer, float, double and long.
Set And Assign Doubles - String For Gross Pay?
Dec 15, 2014I'm working with doubles I'm trying to figure out how to set this up so it works?
I'm just stuck on how to set and Assign a double FedTaxWitholding that gets the Fed Tax Withholding = Gross Pay * Fed
Tax Withholding Rate.
Do I need a string for Gross pay?
Java Program Using If / Else - Multiple Doubles
Oct 14, 2014I am new to Java and I am having trouble figuring out why input.nextDouble(); is not working for the multiple doubles.
import java.util.Scanner;
public class SimpleMenu
{
public static void main(String [] args)
{
int userInput;
int input = 0;
double circleArea = 0;
double triangleArea = 0;
double rectangleArea = 0;
[Code] ....
Method That Returns Largest Value Of Array Of Doubles?
Jan 26, 2015Write a Java method that returns the largest value of an array of doubles passed to the method as an argument.
Back into java wasn't sure how to do it for doubles did one in the main for integers and then added a method changed from int to double and now i'm lost as go why its not working.
package kickstarter9;
public class Kickstarter9 {
public static void main(String[] args){
double myList;
double[] myList = {6.0, 4.1, 2.4, 6.8, 1.9, 9.4, 2.8, 4.6, 9.3};
// find the largest value in the list
[Code]...
Infix To Prefix - Pow Only Takes Int Values Not Doubles
Feb 7, 2014I am having a problem with infix and prefix ... Here is the code
import java.util.StringTokenizer;
import static java.lang.Math.pow;
import java.util.Stack;
public class Calculator {
static int precedence(char op) {
switch(op) {
[Code] ....
it says in line 72
possible loss of precision
required: int
found: double
the pow only takes int values?not doubles?how do i fix it?
Return Smallest Of 10 Doubles (User Input)
Oct 1, 2014This code will let a user type 10 double's, and return the smallest of those 10 double's. But I don't really understand what happens in de last for-loop.
package hsleiden.webcat.exercise06_09;
import java.util.Scanner;
public class Exercise06_09
{
public static void main (String[] args){
double[] allNumbers = new double [10];
[Code] ....
Swing/AWT/SWT :: Using Doubles For Positioning Objects And Testing Equality
Aug 15, 2014I've been noticing some of my programs have been a little buggy recently, and think it's down to confusion over doubles and positioning. Lets say I have a label called banner that I want to scroll across the screen. Now I need to know the label's width in order to position it, but the width depends on the amount of text, so i use this code:
double bannerWidth = banner.getWidth();
Which forces me into using a double if I want to be accurate.
But the problem is that I'm trying to use a condition that compares the label's horizontal position (currentX) to the left edge of the screen (LEFT_EDGE), minus the width of the label (bannerWidth). In other words when the label is off the screen, it should go back to its starting position.
I assume that means that any variables I use to track the label's position (in this case currentX), or constants that I use to check equality (LEFT_EDGE), have to be doubles as well?
My difficulty is that I iterate currentX. But currentX--; won't work because doubles don't iterate as I'd expect.
So casting becomes an option..... but if I cast to an integer I effectively lose width on the label. And that is magnified each loop, resulting in the label's starting position moving further and further to the left.
Arithmetic Tester Program
Aug 6, 2014How do i go about developing a simple arithmetic tester program which can be used to support young children improve their arithmetic skill. The program should accepts string data for the player's name and the number of questions they want to try, which will be entered by the user. The program should take in the following inputs from the user:
The name of the player, so that the game can refer to them by name in messages. The name must be between 2 and 20 characters inclusive.
The number of sums that the user wants to attempt. This number must be a whole number, and be between 2 and 50 inclusive.
The program must check that the values entered fall within the valid ranges. The program must also check that no empty strings are entered for names.
Once the player has entered their name and the number of questions they want to attempt, the game begins. The program must generate sums for the player.
The program should generate one question at a time and display the question for the user. The questions must involve two numbers and be either a multiplication, division, subtraction, or addition. For example, the following are all valid questions:
3 * 4 = ?
8 / 2 = ?
7 + 1 = ?
9 - 8 = ?
The first number, second number, and arithmetic operator (multiply, divide, add, subtract) should all be chosen randomly, the program should Generate a new random number for each of the three parts of each sum. this requires you to choose one of the four symbols based on which random number is returned.
A few checks must be carried out before a generated question is displayed to the user. If the question is an addition question, no checks are required. If the question is a multiplication question, no checks are required. However, checks are required for subtraction and division sums.
If the question is a subtraction question, the program must check that the second number is equal to or smaller than the first number. Whilst the second number is larger than the first number, new numbers should be generated.