Array With Double And Int
Apr 11, 2015Okey so i want to make an array like this
km = miles
10 6.214
15 9.321
20 12.428
and so on its a converter between km and miles and i have no clue how to do this...
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Using For Loop To Populate Array With Random Double Values
Oct 26, 2014Write a program that creates an array that can hold 9 double values that represent baseball batting averages for a starting baseball lineup. Use a for loop to populate array with random double values in the range of 0.00 to 0.500. Recall that "double" values are what Java calls "real" numbers. Use a second for loop to print the values in the array with one number per line. Finally, use a third for loop to traverse the array and find and print the maximum batting average in the array. Note: you will need to use String.format to control the precision of a double number when you print it- Here is my code so far:
public class P2F {
public static void main (String[] args) {
double [] player= new double [9];
//player[0]= Math.random();
for (int index=0; index < player.length; index++) {
[Code] ....
When I open the terminal window I get different variations of this [D@4545c5]. I would like to know all the things I am doing wrong.
Declare Array Of 50 Elements Of Type Double - Print Output 10 Elements Per Line
Feb 5, 2015import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class array
{
public static void main(String[] args)
[Code] ...
Is there a way to write this, where, alpha is one array.
Write a program that declares an array "alpha" of 50 elements of type "double". Initialize the array so that the first 25 elements are equal to the square of the index variable and the last 25 elements are equal to three times the index variable. Output the array so that 10 elements per line are printed.
If I have an array of 50 integers, can I break that to read in lines of 10?
Conversion From Double To Int?
Nov 30, 2014I'm having some trouble with a code I am writing for class. I had an 2 errors like this before this one and fixed it by changing int avgRe, avgMiles =0; to double. Now I am getting this error and am stuck on what I need to change. Here is the code:
import java.io.*;
import java.util.*;
import java.text.*;
public class Reimbursement_3_09 {
static Toolkit tools = new Toolkit();
public static void main (String [] args) throws Exception {
[Code] ....
This is my error:
[code=Java]
Reimbursement_3_09.java:33: error: incompatible types: possible lossy conversion from double to int
summary (outFile, totalAmount, ctrMiles, ctrMilesgt0, avgRe, avgMiles);
^
Some messages have been simplified; recompile with -Xdiags:verbose to get full output 1 error
How To Compare Double
Jun 17, 2014 how can i compare two double values is this correct
Java Code:
public boolean isEqualToD(double s_src, double s_compareTo)
{
boolean flag = false;
try
{
if(s_src == s_compareTo)
{
flag = true;
[code]...
Percentage Of A Double
Feb 14, 2014Java Code:
double Compact=30.50;
double Full=40.50;
double discount=.07;
double FullDiscount= 37.67;
double CompactDiscount= 28.37; mh_sh_highlight_all('java');
My question is how do I configure this so that when / if I need to change the discount value, it automatically adjusts the % discount off of the Full or Compact?
All I can get to work is simply hardcoding it and assigning the discount value, i'm probably just messing up the syntax.
Cannot Cast From Object To Double
Nov 9, 2014ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine engine = mgr.getEngineByName("js");
String expres = calc.getText().toString();
calc.setText(expres);
try {
calc.setText(((double)engine.eval(expres)) + "");
} catch (Exception e) {
}
This line: calc.setText(((double)engine.eval(expres)) + "");
*The error message for this line: Cannot cast from object to Double
Double To Hex String Conversion
May 8, 2014I am trying to convert the double 4270571936.0000000000d to a hex string using Double.toHexString() and the answer I'm getting is 0x1.fd17834p31, what does p stands for?
The answer I'm expecting to get is 0x41efd17834000000 so not sure why it won't give me the correct answer?
The following floating point Double to hex calculator shows the write answer right Floating Point to Hex Converter
JSF :: How To Confirm A Field Only Contain Double
Jun 30, 2014I have a jsf page.i need to confirm one filed only contain double value.how to validate this? I checked and found there is a validateDoubleRange,but its not suitable for this.
View Replies View RelatedCannot Convert From String To Double
Oct 4, 2014//Students Full Name
firstName = JOptionPane.showInputDialog("Enter student " +
"first name.");
lastName = JOptionPane.showInputDialog("Enter student " +
"last name.");
// Get test grade (numbers)
[b]test1 = JOptionPane.showInputDialog("Enter test1 grade")[/b];
The line in bold is where that error comes up. I know it something simple but I can't remember. I declared both firstName and lastName as Strings and then the test1 I declared as double. I had a similar error in a previous assignment where I had a integer(age) input and then i had an output statement asking for a name all I needed to do was put keyboard.nextLine(); after my age input and I was fine.
Conversion Char To Double Value
Mar 31, 2015I need to understand the java Conversion.
I have a char[] containing ASCII characters that need to be converted into int value and double value.
The int value are always stored in 1 char size like 'j'. I extracted it succesffully by converting the char in a ascii bytearray and then used: Integer.parseInt(sb.toString().replace("0x", ""), 16);
How can I get the Value as double when i used the char[] with size 2 or 4 ?
Example : final char[] charValue = { 'u', ' ', '}','+' }; what is the associate Double value ?
Example : final char[] charValue = { 'T', ' ' }; what is the associate Double value ?
Example : final char[] charValue = { 'T', ' ' }; what is the associate int value ?
Typing Double Name In The String
Oct 26, 2014I am making a program where the user types in how many students, the student name and the student result. My problem is typing in a dobule name for instance: Tom Tom.
I have tried both:
String name = input.Next(); -> Only works with one name.
and
String name = input.nextLine(); -> Skips right trough and ask me to type result again.
Here is my code:
Java Code:
import java.util.Scanner;
public class c5e8 {
public static void main(String[]args){
Scanner input = new Scanner (System.in);
int highestResult = 0;
String highestName = " ";
[Code] ....
What Is Difference Between Float And Double
Jan 31, 2011What is the difference between float and double?
View Replies View RelatedHow To Use Public Double GetXCoordinate
Dec 9, 2014I am trying to understand a question:
R2 (x,y) -- Make the Point class code that implements a corresponding abstraction to a given point in R2. You should explicitly provide the manufacturer's code P (double x, double y) for the Point class. And code for the methods, whose definitions are:
- public double getXCoordinate ();
- public double getYCoordinate ();
- public setXYCoordinates (double x, double y);
- public moveTo (double x, double y);
- public printAtts ();
Double Number Formatting
Oct 29, 2014I have a real number. example:
double number = 1.95842175;
I want to split it into 2 integers:
int a1 = 1;
and
it a2 = 95 (2 numbers after '.')
How?
Program Conversion Int To Double
Apr 20, 2015I am working with a java program that uses binary and sequential search. i have those two methods working. In the program i also need to return the price of parallel arrays. This is my code so far:inventory class:
//FileName: InventoryData.java
//Prog: Brock Paston
//Purp: To load and search through arrays with binary and sequnetial search.
package stu.paston.program6;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Scanner;
[code]....
Sorting 10 Double Arrays
Sep 17, 2014I'm trying to sort 10 inputted numbers (double precision) using the Array.sort() method. I can get the 10 numbers inputted, but the output is ten 0.0s; now (and this how I know I am learning some things) I'm fairly certain that the variable number is not storing the numbers inputted by the user otherwise I wild be seeing the program work correctly.
So my question is why isn't number storing the inputs?
import javax.swing.JOptionPane;
import java.util.Arrays;
public class KrisFrench3 {
public static void main(String[] args) {
double[] number = new double[10];
for(int i = 1; i <= i; i++) {
[Code] .....
Double-clicking Jar Files?
Nov 10, 2009I've been programming for a while, but I never made executables... just ran it from the compiler. Now, however, I really want to have an icon for one of my programs that would be conveniently located and clickable. So, I made a jar file, both in Eclipse and BlueJ. When I run this file in command line, it works fine (with "java -jar ..."). In case of Eclipse, this worked with both "jar" and "Executable jar" options. However, when I double click the icon, nothing happens. First I was getting "can't find main class" error, but that was an easy fix with the manifest file. But now, nothing seems to happen at all. Could this be because the program is supposed to run in the command line or whatever the compiler offers and there is nothing to force the computer to open one of those windows?
View Replies View RelatedDouble Ended Queue
Jan 7, 2015implement Double Ended Queue?????
import java.util.*;
public class DoubleEndedQueueImplHW22 {
ArrayList<Integer> deque = new ArrayList<Integer>();
public void insertFront(int a){
System.out.println("adding at front: "+a);
deque.add(0,a);
System.out.println(deque);
[code]....
Changing Double To Fraction
Jan 6, 2015I was wondering how you would change a double to a fraction.
For Example:
double x = .5
From this we know that the fraction is obviously 1/2 (simple form of course), but what are the steps necessary to convert the double to the fraction 1/2?
BlueJ (double Input)
Jun 21, 2014I typed the following program using BlueJ
import static java.lang.System.out;
import java.util.Scanner;
import javax.swing.JFrame;
public class Main {
public static void main (String args[]) {
Scanner read = new Scanner (System.in);
out.print ("> ");
double num = read.nextDouble();
out.println (num);
}
}
When I compile the code it gives me no errors; however when I run the program and write a floating point number it gives me the following message:
java.util.InputMismatchException: null (in java.util.Scanner)
I used to use an online compiler and the nextDouble() method worked perfectly there.
Testing Double Null
May 2, 2014how to execute a particular class. I've created a Kinematics class that will execute and calculate all the functions pertaining to kinematic equations. In the main class, I will have the user provide the data in JTextField. Now I need to test which JTextfields (variables) were left empty. I plan to use a number of if/else statements :
if(distanceI != null && distanceF != null)
The problem with this is that these variables are double and therefore cannot be tested as null. I read a few things about Double but I really don't see how I'm supposed convert each double variable to Double, is that even possible?
public class Kinematics {
double distanceI, distanceF, velocityI, velocityF,
velocityAverage, acceleration;
public Kinematics(){
//v2 = v1 + a*dt
if(distanceI != null && distanceF != null){
[code]...
Swing/AWT/SWT :: How To Get Double Value Into JTable Cell
May 29, 2014My latest issue was that I wanted to only get a double value into a JTable Cell.
So first I Overrode the getCellEditor(int row,int col) method of my JTable, so if I was in a cell i knew I needed a double value I returned my Editor.
My editor filters out anything but numbers. I also check to make sure we get one and only one decimal point.
Other solutions Ive seen use keyboard Listeners, but to me that doesn't work. What if the user cuts and pastes data? My solution handles that as well.
It doesn't handle if they try to cut and paste something like 1234abcd.bob.123.23 , this would result in 1234..123.23 pasted in. I'll handle faulty values on the getValue method of my AbstractTable, but as long as the user is using mostly valid data this works well.
public TableCellEditor getCellEditor(int row, int col) {
if (row==TheRowWant && col==TheColumnI want) {
return (new DefaultCellEditor(createDoubleTextField()));
}
}
private JTextField createDoubleTextField() {
final JTextField field = new JTextField();
[Code] .....
Round Up Double Numbers To Desired Value?
Mar 28, 2015I have a double/big decimal value with 2 decimal places....What I want is that if decimal value is .01 - .49, it should round up to 0.50.
Then if decimal value is between 0.51 - 0.98, it will round up to 0.99.
Is there a function in double that can do this? How can I do this?
How To Get Double Variable From Keyboard Input
Apr 8, 2014I am testing to get a double value from keyboard input as below?
import java.util.Scanner;
public class EchoLine{
public static void main(String[] args){
double amount;
Scanner myScanner=new Scanner(System.in);
amount=myScanner.nextDouble();
System.out.println(amount);
}
}
I type 5.95 in Console View of Eclipse but as a result I get an error on line 9.
Using Double Dimensions Strings And Methods
Apr 17, 2015i have to use a if loop. I just started using methods and loops..You have been hired as a software developer for Canada’s customs - Toronto Pearson International Airport. Your job is to develop part of the Canada Passport System. The Database Administrator has forwarded to you the database for all the Canadians. For simplicity, assume you only have five records (i.e., only five people on file). These fixed records are the following:
First name, Last name, SIN, Last Date of Entry to Canada, Number of Entries
Mike beee 4567 12-12-1999 7
Jessie weree 4444 07-07-2007 1
Liza veee 2121 05-05-2013 2
Zico qeeee 2444 Never left the country 0
the two dimensional array stores all the values. In addition, all these values should be of type String.The Canadian officer can always see the following four choices:
1) Show custom’s database,
2)Update custom’s database,
3) A summary of a passenger’s record, and
4) Exit.
Choice 1 : always allows the officer to see all the database records (i.e., the five records). Each of these records consists of the following: First Name, Last Name, SIN, Last Date of Entry to Canada, and the Number of Entries (i.e., see the above stored values).
Choice 2 : allows the officer to update the database whenever one of the five Canadian passengers arrives. Once the officer chooses this option, the system will ask him/her for the SIN of the passenger. Then the system will ask for today’s date (i.e., the recent entry date). The system will then reflect those changes on the console screen and the number of entries will be increased by one.
Choice 3: summarizes the record for one passenger where his/her first and last names and last date of entry to Canada will be shown. The last date of entry should only have the last four digits (i.e., only the year). To extract those digits, you should use the String’s method(s). However,before a record is summarized, the records of all Canadians should be shown on the screen in order to allow the officer to choose among those records. Choice 4 allows the officer to exit from the system completely; otherwise the list of choices should be always shown on his/her monitor.This is the code i have so far.
import java.util.Scanner;
public class QuestionFive{
public static void main(String[] args) {
double passportInput;
Scanner sc = new Scanner(System.in);
// public static int generalList() // to show the list of choices and return the chosen option
//
// public static void updateRecords(int recordSize, String[][] passportDataBase) //to update the records
//
[code]....