Perform Mathematical Calculation Between Two Numbers Entered By User

Feb 16, 2015

I need to write a Java program to perform a mathematical calculation between two numbers entered by the user. User has to choose the mathematical operation and input it and then when the user enters 2 numbers, he gets the answer. When user enters any other character other than *, /, + and - he should be able to exit. Perform calculation between numbers should be until user decided to exit from the program. My code is below, calculation part goes well, but can't get it exit when user enter any other character.. How to fix it?

import java.io.*; 
public class q11

public static void main(String[]args)throws IOException
{
InputStreamReader ISR=new InputStreamReader(System.in);
BufferedReader BR=new BufferedReader(ISR);
while(true){
System.out.println("Enter..");
System.out.println("* : For multiplication");

[Code]...

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Swing/AWT/SWT :: GUI To Add A List Of Numbers Entered By The User

May 9, 2014

I have a GUI with a textArea for the user to input numbers, a button which should "listen" for those numbers, and then a textField to display the sum. I have my code working for user input of one number; but I'm at a loss as to what sort of loop I need to create to get it to read each line of input. I wasn't sure whether to put this in the beginner forum or here, because I am definitely a beginner.

So my code thus far that works with one input:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

[Code] ....

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Math On Three Numbers - Get Average / Sum And Number Entered By User

Feb 25, 2015

Java program : For this assignment you are going to write code for the following class:

MathOnThreeNumbers

Here are the specifications of class MathOnThreeNumbers:

Methods of class MathOnThreeNumbers:

1. inputThreeNumbers
2. getAverage
3. getSum
4. getNumberOne
5. getNumberTwo
6. getNumberThree

Constructor of class MathOnThreeNumbers

write a constructor that initializes the first, second, and three numbers to 1, 2, and 3 respectively.

Specs for the methods methods:

1.
name: inputThreeNumbers
accessibilty: public
arguments: none
what it does: asks the user for three numbers of type double

2.
name: getAverage
accessibilty: public
arguments: none
what it does: returns average of the three numbers

3.
name: getSum
accessibilty: public
arguments: none
what it does: returns sum of the three numbers

4.
name: getNumberOne
accessibilty: public
arguments: none
what it does: returns the first number entered by the user

5.
name: getNumberTwo
accessibilty: public
arguments: none
what it does: returns the second number entered by the user

6.
name: getNumberThree
accessibilty: public
arguments: none
what it does: returns the third number entered by the user

Here is an example of how the class MathOnThreeNumbers works. The following code produces the output displayed after the code.

MathOnThreeNumbers mm = new MathOnThreeNumbers();
System.out.println("first: " + mm.getNumberOne());
System.out.println("second: " + mm.getNumberTwo());
System.out.println("third: " + mm.getNumberThree());
mm.inputThreeNumbers();

[Code] .....

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Apr 15, 2014

Write a Java program that asks the user to store 10 numbers in an array. You should then print the array in the order entered and then print in reverse order. However, instead of putting all the information in the main, you should use a class called PrintIt. The PrintIt class should have an instance variable that is an array to hold the numbers. You should have a method that will print the array in the order entered. You will also need a method to print in reverse oder. Then create a tester class that asks the user to enter 10 numbers and puts them in an array.

So far I've got this.

public class printIt {
int i;
int [] numArr = new int [10];
public printIt () {
i = -1;

[Code] .....

Output:

Enter a number:

8
34

Forward:

8
34

Reverse:

34
8

end

what i want as an number is being able to print out 10 numbers but this only lets me do two numbers. Why is that so?

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List All Prime Numbers Between Two Entered Numbers

Oct 17, 2014

Program is to list all prime numbers between two entered numbers.

import java.util.Scanner;
public class question6 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter lower int:");
int x = input.nextInt();

[Code] .....

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Dec 12, 2014

I have to ask the user to enter 4 whole numbers, and then the program will calculate:

> x numbers are positive and even
> x numbers are positive and odd
> x numbers are negative and even
> x numbers are negative and odd

but I have trouble with the conditions. How do I form the conditions to calculate this? My professor said I can do this with only four IFs (or ELSE IF). This is what I did:

import java.util.Scanner;
public class Calc{
public static void main(String [] args){
Scanner sc = new Scanner(System.in);
 
int pe = 0, po = 0, ne = 0, no = 0;
/* four variables for each result
pe - positive even
po - positive odd
ne - negative even
no - negative odd

[Code[ ....

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Oct 8, 2014

Basically I need to make a program prompts the user for an integer, check to make sure the length entered by the user is a power of 2 and at least 2. Then I need to convert from base e to base 2 then I need to print the tick marks of a ruler based of the value of the length.

I got the whole converting thing working and the check for a power of 2, that wasn't an issue because it didn't require any recursion. I just don't know how to print out the proper tick mark values.

The way it is supposed to work is that it needs to look like this. Say the user enters 8;

012131210
012345678

Or if the user enters 16;

01213121412131210
01234567890123456

The bottom row is pretty much just the index value, that I print fine.

The top row though is supposed to be the length of the ticks on a ruler, with the middle most value being the value of the conversion from base e to base 2 from above. I can get that printed and what I get just looks like this.

For 8;

000030000
012345678

For 16;

00000000400000000
01234567890123456

As you can see I can get the middle value and the index values below but I don't know how to use recursion to get the right numbers.

Here's my current code.

import java.util.*;
public class TickMarks {
public static void main (String args[]){
Scanner input = new Scanner(System.in);
boolean looping = true;
while(looping == true){
System.out.print("Please enter a length: ");

[Code]...

Now the methods isPowerOfTwo() and printLength() both work fine. However, I'm not sure how to get the left and right side working.

My thoughts were to split the length in half and get a left and right side. I gave both of them arrays so I can keep track of the values. Now as you've seen above I get all zeros and I know it's because that's the default value in an array, I just don't know how to get the proper values.

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Double RelativeFrequency Value Which Does Calculation / End Result Is Number With Lots Of Decimal Numbers

Nov 24, 2014

for (int i = 0; i < letters.length; i++) {
double relativeFreq = (onesAverage()/letters[i]);
char a = characters.charAt(i);
double j = score[i];
System.out.printf();//ToDo

Above is my current code. Basically- There is a string called characters of length 26 (1 char for each letter in alphabet), a double relativeFrequency value which does a calculation and the end result is a number with lots of decimal numbers. The score array has set double values within the array.

What I want to do is create a print f statement where I print out each of the values I initialized above WITH specific amounts of spaces in between. So it should be in this order:

a (spaces) j (spaces) relativeFreq (newLine).

Between J and relativeFreq there should be 4 spaces, however if the value in relativeFreq is greater than 10 (it won't be greater than 100)- then there should be 3 spaces. Everytime I try to create a printf statement my code ends up crooked for some of the values.

for (int i = 0; i < letters.length; i++) {
double relativeFreq = (onesAverage()/letters[i]);
char a = characters.charAt(i);
double j = score[i];
System.out.printf("%c %.4s %.4s%n",a, j, relativeFreq);

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Feb 23, 2014

As stated in the subject I'm a newbie when it comes to Java Programming (I'm in my second week of class). I'm trying to create a Retail Calculator for a class and need to multiply two values together (Price, Discount) in order to get the sale's price when the user hits a Calculate button. The price and discount are user input values from textfields in the beginning of the code.

public void actionPerformed(ActionEvent e) {
String price;
String discount;
float salePrice;
//Get the original price from price textfield
price = priceValueField.getText();

[Code] ....

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Mar 29, 2014

How to calculate the minimum and the maximum in the same program.
 
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
int integers;
int[] numbers;
numbers = new int[10];
int max;
int min;
 
[Code] ....

My result when I input numbers are always the following:

"Numbers in reverse order are: 9, Numbers in reverse order are: 8,
Numbers in reverse order are: 7, Numbers in reverse order are: 6
Numbers in reverse order are: 5, Numbers in reverse order are: 4,
Numbers in reverse order are: 3, Numbers in reverse order are: 2,
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Program To Pull Prime Numbers Between Two Entered Values

Oct 18, 2014

Program to pull prime numbers between two entered values,

import java.util.Scanner;
public class question6 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter lower int:");

[Code] ....

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Apr 22, 2015

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b. Repeat 1a, keeping track of both the maximum element in the array and the index number for the maximum. After displaying the numbers, display these two messages:

The maximum value is: _________
This is element number __________ in the list of numbers

Have your program display the correct values in place of the underlines in the messages.

c. Repeat 1b, but have your program locate the minimum value of the data entered.

I did parts a and b but for part see i just want to know if i did it correctly or not

import java.util.Scanner;
public class MinimumValueArray {
public static void main(String[] args) {
//Variable Declaration
Scanner keyboard = new Scanner(System.in);
int size = 10;

[Code] ,.....

When I run it i get this The minimum value is 0.0

The element that holds the value is 0 right away. is this right for the minimum or am i supposed to enter values and it will display the minimum value like in parts a and b wit the maximum? will the minimum just always be 0 or ?

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Nov 11, 2014

So I have to convert strings to double numbers and there can be no exception.

The strings that aren't numbers or do not fit into a set criteria have to be discarded.

When I try to write this I get an exception when a non-numeric is entered and the code stops.

What can I do? Also, am I finding the average of the array correctly?

import java.util.*;
public class Grades{
public static void main(String args[]){
int arraycount = 0;
final int SIZE = 10;
int validArraycount = 0;
final int ValidArraySize = 10;

[Code] ......

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Oct 13, 2014

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import java.util.*;
public class Date{
public static void main (String arg[]){
int month = 0;
int day = 0;
int year = 0;

[Code] ......

My issue with my program is the output for the day.

If I enter 30 for the date I get this: Date is invalid
Date is invalid
Date is invalid
Date is invalid
Date is invalid

I wanted to know how what is wrong and why it is doing this.

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Jun 18, 2014

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Identifier class:

package votek;
* Purpose: Class is used to run checks on possible hashes that the user has entered.
*/
public class Identifier {

//Hash entered by user is stored here
private String hash;
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//Method that runs the other hash methods checks and prints out the results.

[Code] ...

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Feb 21, 2014

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Ex:this should return a true!! This should return false!

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(3,2,4) (1,2,2)
(-10,-8,-9) (7,7,9)

My program seems to work ok when i enter number in order like 1,2,3 = true , and all the numbers for false seem to be working as well! my problem is when i enter number like 3,2,4 that are not in order but still are consecutive!! I thought that another if statement would be the solution but i have tray several different ones and still can't make it work !!!

Java Code:

import java.util.*;
public class Consecutive{
public static void main (String [] args){
Scanner console= new Scanner(System.in);
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String numbers = console.nextLine();

[[Code] .....

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Jul 2, 2014

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May 3, 2015

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Can't be over 12 mins.
Can't be over 10 MB.
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I'm really struggling with how to even go about this. I'll post majority of my code below, I know a lot of it can be condensed/improved but I'm just trying to focus on functionality at the moment.

Interface class:

public class Interface
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Scanner console = new Scanner(System.in);
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[Code] .....

In short, the aspects that are relevant to the playlist functionality are the addSongtoPlaylist() method in Interface class, the getSong() method in SongDatabase class and the Playlist class.

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/**
* Auto Generated Java Class.
*/
import java.util.*;
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int guess;
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[Code] ....

I am not sure how to make the program check if the letter entered by the user matches the one in the array. also i am not sure how to make the program run again with a new word.

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Jul 26, 2014

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");
Scanner st = new Scanner(System.in);
while(st.hasNext()){
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Nov 6, 2014

I have returned with yet another problem but I think this one might be a bit easier to fix.

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^

I don't understand why it's giving me this error nor do I understand why result seems to inherently be an int. (Also the public static int sumDigits(long n) method was given to me by the book so that is what I am supposed to use).

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

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package com.example.imc;
import android.os.Bundle;
import android.view.View;
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import android.widget.Button;
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[Code] ....

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Nov 23, 2014

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import javax.swing.JOptionPane;
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package samples;

import homework.EmployeeA;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
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import java.io.IOException;
import java.util.ArrayList;
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[code]....

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Jun 28, 2014

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What I have compiles just fine. I'm actually pretty thrilled just with that. Here is what I have:

class factorial {
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[Code] ....

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