Calculate If User Enters 20 - Output Should Be 71 Prime

Jul 22, 2014

import java.util.Scanner;
//Calculates the prime #1000.
public class Prime {

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int n, i=2, x=2;

[Code]....

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Output Min And Max Numbers The User Enters - Storing Value

Jul 17, 2014

I need to receive input from the user, as many times as he wants. tha is done with the while loop. I also need to output the min and the max numbers the user enters, therefore i have the if statememnts. also if the user enters only one value i need to output that one value as the min and the max.

int min =0;
int max = 0;
int option = JOptionPane.YES_OPTION;
while ( option == JOptionPane.YES_OPTION){
String dataString = JOptionPane.showInputDialog("Enter an integer");
int data = Integer.parseInt(dataString);

[Code] ....

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Writing A While Loop To Read Positive Integers From User Until User Enters EOF Character

Feb 24, 2014

import java.util.Scanner;
public class Project_5
{
public static void main (String[] args)
{
Scanner input= new Scanner (System.in);

[code]....

So I'm attempting to have this program take the users input of integers, pressing enter in between each one. If they enter a negative number it lets them know that its invalid. At the end of the program it takes all of the valid integers entered and must add them and average them. I've put the final println in there as a placeholder. If the user types in "6" then presses enter and types in "3" , the output is:

There were 3 valid numbers entered.
The sum of the valid numbers was --- and the average was ---.
There were 0 invalid numbers entered.

It then continues on allowing the user to enter more values. Here is the example output for correct code"

Enter a positive value (EOF to quit): 4
Enter a positive value (EOF to quit): 7
Enter a positive value (EOF to quit): 8
Enter a positive value (EOF to quit): 2
Enter a positive value (EOF to quit): -1
The number "-1" is invalid.

Enter a positive value (EOF to quit): 8
Enter a positive value (EOF to quit): 0
Enter a positive value (EOF to quit): -4
The number "-4" is invalid.

Enter a positive value (EOF to quit): CTRL-D

There were 6 valid numbers entered.
The sum of the valid numbers was 29 and the average was 4.83.
There were 2 invalid numbers.

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How To End Program If User Enters Certain Value

Oct 28, 2014

In my computer science project the program has to end if the user enters 0 as his choice from a menu given to him, so how would I go about ending the program.

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Program Repeat Until User Enters Number 4 To Exit?

Feb 18, 2014

My question is how can I make the program repeat until the user enters the number 4 to exit?
 
/**
* Write an application for a furniture company; the program determines the price of a table. Ask the user to choose 1 for pine, 2 for oak, or 3 for mahogany. The output is the name of the wood chosen as well as the price of the table. Pine table cost $100, oak tables cost $225, and mahogany table cost $310. Also ask the user to specify a

(1) large table or a
(2) small table.

Add $35 to the price of any large table and add nothing to the price for a small table. Display the output. Your program must repeat until the user chooses to exit.

*/
import java.util.Scanner;
public class Wood {
public static void main(String[] args) {
Scanner input = new Scanner (System.in);
System.out.println ("Table Prices");

[Code] .....

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Program That Takes User Odd Number And Print Prime Numbers Lower Than User Input

Nov 4, 2014

I have been struggling with this program for weeks. This program is supposed to take a user's inputted odd number and then print out all prime numbers lower than that number.

public class PrimeNumber
{
Scanner scan = new Scanner(System.in);
int userNum;
String neg;

public void getUserNum()

[code]...

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Validation Loop That Runs Until User Enters A Valid Binary

Nov 17, 2014

I'm trying to do a user validation loop that runs until the user enters a valid binary, q, or Q. I think the rest of my program should work as intended, but here is the areas of concern:

public static boolean isBinary(String num) //Check if the entry is binary
{
for(int i = 0; i < num.length(); i++) {
if(num.charAt(i) != 0 || num.charAt(i) != 1){
return false;

[Code] .....

The program runs without errors otherwise.

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Exception Thrown If User Enters Negative Number - Program Gets Suspended

Oct 19, 2014

In my cs class, we have to write a program that throws an exception if the user enters a negative number, the program should prompt the user to enter only positive numbers and then let them retype the number. But everytime I throw an exception, my program gets suspended.

What am I doing wrong, or is there no way to continue a program if an exception is thrown? Does the program automatically get suspended when an exception is thrown?

try{
do
{
N = kb.nextDouble();
if(N<0) {
throw new NegativeArraySizeException();
}
else
j++;
}
while(j==0);
fill.size(N);
}
catch(NegativeArraySizeException e) {
System.out.println("The number you entered must be positive. Please try again.");
}

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Determining User Input To Be Prime Number

Feb 12, 2015

Any better way to write a program that takes a user number input and the program determines whether or not the number is prime or not. It was suppose to be a number between 0 and 8,000,000.

import java.util.Scanner;
public class prime1
{
public static void main(String args [])

[Code].....

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Long Type Output File - Print Prime Numbers Between Given Range Of Numbers

Aug 22, 2014

I tried to create file and write the output of my program in it in java when i use WriteLong then the file does not contain long value, how I create this file my program is to print prime numbers between 500000 to 10000000

public class primenumber {
public static void main(String[] args) {
long start = 5000000;
long end = 10000000;
System.out.println("List of prime numbers between " + start + " and " + end);
for (long i = start; i <= end; i++) {
if (isPrime(i)) {
System.out.println(i);

[Code] ....

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How To Add A Method To Calculate Mean Of Length Of Each Word Output

Mar 6, 2014

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Assignment extends Applet implements ActionListener {
TextArea textInput = new TextArea(); // user input
Button analyzebutton = new Button("Analyze");
Button resetbutton = new Button("Reset");
Label lbloutput = new Label ("Please enter text into the textbox!");

[Code] .....

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Calculate Total Sales After Each Football Game - JOptionPane (input / Output)

Mar 5, 2014

This specific assignment requires me to write a program that calculates the total sales after each football game. There are 4 types of tickets: box, sideline, premium, and general admission. After each game, data is stored in a file... then output the number of tickets sold and total sale amount. Format your output with 2 decimal places.

Okay I know there is a I/O section and wasnt sure where to post this. I need some insight on how to use file input and output as well ... Here is my program:

import javax.swing.JOptionPane;
import java.text.DecimalFormat;
public class ticketsSold
{
public static void main(String[] args)
{
String BoxSeat;
String SideLine;

[Code] ....

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Take Input From User And Calculate Value Of PI Using Formula

Sep 6, 2014

I'm supposed to take an input from the user and calculate the value of pi using this formula: 1/1 - 1/3 + 1/5 - 1/7 etc... so on alternating between minus and plus and denominator increasing by 2 every time. If the user inputs the number 3, then it should print (1/1 - 1/3 + 1/5 - 1/7 + 1/9) *4. The idea here is that the higher the input of the user is, the higher the equation will be close to pi.

This is what i have so far :

import java.util.Scanner;
public class Pi
{
public static void main(String[] args) {
double first = 1/1;
double second = 1/3;
Scanner input = new Scanner(System.in);
System.out.println("Enter a Number to calculate how far you want the formula to perform: ");
double count = input.nextDouble();
}
}

This is literally all i have, i know i need a while loop and an if loop.

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Calculate Nth Fibonacci Number And Returns That To User

May 1, 2014

I have to create a program that calculates the nth Fibonacci number and returns that to the user. Fibonacci said his number sequence would describe the ideal breeding patterns of immortal rabbits. So, you are going to make this vision a reality.

First, take in a numeric value from the user and calculate that value in the fibonacci series. Next, find an image of a rabbit and display the image on a GUI (put the image as an icon on a label!) the number of times returned by the algorithm (Put all the aforementioned labels on one panel with FlowLayout!).

You need to remove the old images from the Panel. Probably the easiest way to do this is to create a whole new panel and remove the old one (hint: the remove method of JPanel should come in handy)

You could use an array of JLabels
You will need to create a new JLabel and add each member of the array to the panel
I should be able to scroll to see any images that are off screen

I am having difficultly on to making the array list for JLabel, and getting the Fibonacci sequence to show the pictures of rabbits. Below is my current code.

import java.awt.FlowLayout;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Rabbit extends JFrame

[Code] ....

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Calculate And Store Value Into String The User Selected And Keeping It Going

Oct 28, 2014

This is the first time we are using 2 different classes. This is the code I have so far. What I am having trouble is doing the calculations and storing the value into the planet the user selected and keeping it going. I will attach the instructions ....

public class FakeGravity{
// Instance variables
private String planet;
private int VelocityDecay;
private double BouncinessFactor;
// default constructor
public FakeGravity(){

[Code] ....

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Asking User To Put In Radius Of A Circle To Calculate Area / Diameter And Circumference

Mar 5, 2014

I am doing an assignment that is asking for the user to put in the radius of a circle and the program figures out the area, diameter and circumference. It is using 2 different java programs to accomplish this. One with the info on how to get area, diameter and circumference and one is the demo that runs the program. I keep getting errors on my demo.

// Circle Class
 public class Circle {
private double rad;
private double Pie;
private double area;
private double diameter;

[Code] .....

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User Enter A Number For Width And Length - Calculate Area And Perimeter

Apr 27, 2014

I am trying to make a program so that the user has to enter a number for the width and length and it will give the area and perimeter:

import java.util.* ;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class jframe extends JFrame {
private static final int WIDTH = 400;
private static final int HEIGHT = 300;

[Code] ....

It is giving me an error saying that the ExitButtonHandler and ebHandler do not have classes but I don't understand why.

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Power Of Math - Calculate Volume Of A Cylinder By Asking User To Enter Height And Radius

Jan 29, 2015

How do you use power of math. I'm trying to write a calculator to calculate the volume of a cylinder by asking the user to enter the height and radius but when I use pow(2) it doesn't work. I imported java.lang.math class so i dont have to keep using math. for now my code runs just fine since I'm using radius * radius but I would really luv to use the power instead times each other when i have to use higher powers.

import java.util.Scanner;
import static java.lang.Math.*;
 public class Lab2 {
 public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
 
[Code] .....

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Prompts User To Enter 5 Test Scores And Their Names - Calculate And Display Average

Sep 24, 2014

Using Bluejay. Need code that prompts user to enter 5 test scores and their names. Calculate the average and display.

First initial and last name , 5 test scores, and average

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Translate User Inputted Sentence Into MorseCode - No Output?

Feb 19, 2014

The purpose of this program is to translate a user inputed sentence into morseCode. It seems like everything is right to me, but I'm simply not getting output! What am I doing wrong, or what should I add/change?

Here is the main class:

public class MorseCode
{
public static String myInput;
public static String[] myMorse;
public static String myUserInput;
public static char[] myAlph = {'A','B','C','D','E','F','G','H','I','J','K','L','M',
'N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
public MorseCode()

[Code] ....

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Take Input From User And Append Some Text To It - Output Null

Sep 20, 2014

I'm using one method to take input from the user and append some text to it, then I am trying to return the value of the variable and use another method to print it out. But for some reason whenever I try doing this I can't print out anything and I only get a "null" output. Why this is happening?

package Homework3;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Homework3 {

[Code] .....

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Display User Input In Lower Case - Why No Output In Second TextField

Jun 2, 2014

I've done a lot of hardwork for this assignment but I don't know what's why the second textfield which is for output is blank.

All I want is to get the input from user in textfield a and display it in textfield b in lower case.

public void KeyPressed (KeyEvent ke) {
String letter2="";
if(ke.getKeyCode()==KeyEvent.VK_A)
{
letter2=letter2+"a";
btextfield.setText(letter2);

[Code] .....

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JOption Pane - Output Number With Greatest Value From User Input

Nov 7, 2014

Using JOptionPane,ask for 10 numbers from the user.Use an array to store the values of these 10 numbers.Output on the screen the number with the greatest value.

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Amount Of Spell User Uses - How To Increment Initial Randomized Output

Feb 16, 2015

I created my own class and it basically randomizes the amount of 'spells' [magic] a user uses (range 1-5). I can't figure out how to increment the initial randomized output to make something like this :

User X : uses 2 spell.
User Y : uses 3 spells.

User X : uses 3 spells. (Taking the randomized 2 and increment by 1)
User Y : uses 4 spells. (Taking the randomized 3 and increment by 1)

My current setup looks like this : First one is the class I created and the second one is just how the output would look like. (seperate by +++++...)

My goal is to create a METHOD to increment it.

public class Spell {
// Max number of spells
private final int MAX_FACE_VALUE = 5;
// Current face value
private int faceValue;
// New instance of Spell
public Spell() {
faceValue = 1;

[Code] ....

+++++++++++++++++++++++++++++++++

public class SpellOutput {
public static void main(String[] args) {
//Object creation
Spell spellCasterOne = new Spell();
Spell spellCasterTwo = new Spell();
Spell spellCasterThree = new Spell();

[code] ....

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User Input 3 Sides - Output Invalid If Does Not Make A Triangle

Nov 4, 2014

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;
 
[Code] ....

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User Input 2 Ints - Output True If One Is In Range Otherwise False

May 14, 2014

How do I make it so that if both numbers are entered between 10 and 20 it will print false?

The assignment: Ask the user to enter 2 ints. Output "true" if one of them is in the range 10 - 20 inclusive, but not both. Otherwise output "false"

12 99 → true
21 20 → true
8 99 → false
15 17 → false

import java.util.Scanner;
 public class Practice {
 public static void main(String[] args) {
 //get user input
Scanner user_input = new Scanner(System.in);
System.out.print("Enter a number: " );

[Code] ....

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