Started java a couple days ago, and now im working on a calculator. But i'm having a problem with else-if statement. I've made a simple version of the problem here so its easier to identify. If i type in 17, it will give me the answer that i want it to. But if i type in 38, nothing happens.
Java Code:
import static java.lang.System.out; import java.util.Scanner; public class Firstclass { public static void main(String[] args) { Scanner answer = new Scanner(System.in); out.println("Whats your name?"); if (answer.nextLine().equals("bob")) { out.println("How old are you?:"); if (answer.nextLine().equals("17")) { out.println("Nice"); } else if (answer.nextLine().equals("38")) { out.println("good"); } } } } mh_sh_highlight_all('java');
I am a beginner with Java. I have never used SWING before but I have to use it now and I am clueless. I don't know if what I am doing is right.I need to create a simple calculator. My problem is getting the buttons the user clicks to appear in a text field. I know I haven't added the =/*- buttons yet.
I have left actionPerformed practically blank, what to put in ?
import javax.swing.*; import java.awt.*; import java.awt.event.*; /** * Created by IntelliJ IDEA. * Date: 11/12/2014 * Changing Face Program. */ public class Calc extends JFrame implements ActionListener
I am trying to set the look and feel for my calculator to Nimbus but I am having some problems. It looks horrible though nothing at all like the screenshots I have seen for it.
So from what iv learnt in Java and programming in general is that using a case statement is far more efficient that using multiple IF statements. I have an multiple IF statements contained within a method of my program, and would like to instead use a case statement.
So I want to make a simple Java that ask the user to pick a powers and it has two options.If the user picks magic then execute the first if statement then ask the user again which type of magic the user wants.I can't make it work it keeps printing the else statement. Why is that?
import java.util.Scanner; public class Variable { static Scanner zcan = new Scanner(System.in); public static void main(String[] args)
So, I'm working on a Tip Calculator for fun. I have everything worked out for the most part. The feature I am trying to add is to give the user the amount of change they'll get back from their transaction. I do not ask the user any information other than what is their bill.
Please enter your bill total : 5.50 Please enter your name : some name Total : 5.50 Tax : 0.48 -- Based off a tax rate of 8.75% Total with Tax : 5.98 -- 20 percent Tip : 1.10 Total with Tax and 20 percent Tip : 7.08 Total change : <-- I believe this will be about $2.92
I want the total bill to round to the nearest $10 value (e.g. for $5.50, calculate bill to $10. For $13.00, calculate bill to the $20.00, and so on... This way I get an accurate amount of change to give back to the user.
I made a MVC calculator. I was wondering if you could take a look at my design and if I was on track. I am still working on getting it to actually calculate something. All the buttons respond and print text on the JTextField but it is not calculating.
package calculator.MVC; import javax.swing.JButton; import javax.swing.JTextField; public class CalculatorModel { private int sum; private int number; private char opt;
I am making a calculator in Java. However, when I press the "=" button on my calculator, it always returns 0.0, no matter what. I don't understand why? The code is below:
import javax.swing.*;//import the packages needed for gui import java.awt.*; import java.awt.event.*; import java.util.Arrays; import java.util.List; import static java.lang.Math.*; public class CalculatorCopy {
import javax.swing.*; public class BasicCalculator{ public static void main (String[] args) { String output=""; double n1,n2; String operation; operation= JOptionPane.showInputDialog("Please enter your operation");
I have the basic workings of this program just doing all the printing at the end is throwing me off. Anyway here are some of the requirements and my code:
1. Allow the user to input an individual's hours worked. 2. Accumulate the total regular hours worked, the overtime hours worked, the amount of the regular pay, the amount of overtime pay, and the total payroll, for all of the employees entered. 3. Allow the user to enter a zero (0) as the Boolean expression to end the loop. 4. When the loop ends print out all of the accumulated totals with appropriate labels, each on a separate line.
import java.util.Scanner; public class WhileLoopPayCalc { public static void main(String [] args) { final double REGULAR_HOURS = 40f; final double HOURLY_WAGE = 12.5f; final double OVERTIME = 1.5f;
I am facing problem during calculation in my awt calculator. It is showing NumberFormatException. Below is part of code.
if(e.getSource()==b14)//On button 14, label is "/" { String v1=tf.getText().toString(); num1=num1+Integer.parseInt(v1);//num1 is as integer variable tf.setText("");//tf means textField }else
I'm new to java and have been coding for a few hours. I tried to create a calculator (Which has no GUI, just text inputs)which will let you select how to process the two integer (Add, minus, times etc.) I cant seem to get it to work. I will put in the process way such as times and have entered two integers and every time it doesn't work. Here is my code:
import java.util.*; public class Calculator { public static void main (String args[]) { int input1 = 0; int input2 = 0; int answer = 0;
I am currently working on a small java programm. I use netbeans for it. And obviously I am new to java.
Basically its a calculator that change the input value into another value: like 10 € into whatever $ and same with Inch and Centimeters.
Therefore I need a second jDialog Form where i can change the factors for the calculator and start the calculator again.
Here is my problem: I can open the second Dialog but if I want to change the factor it doesn't change the value in the variable and the second calculator frame is with the old factors. It seems the double variable isn't working globally
So I am working on a PostFix calculator that is used in command line for a class project, and I am having a little trouble on developing a memory for it. I have been told to create a hashMap and I have researched it and understand the basics of it. I have the calculating method working, but what I am having trouble trying to implement a way for the user to declare variables. For example this what the user should be able to do:
> a = 3 5 + 1 - 7 > bee = a 3 * 21 > a bee + 28
[code]....
I just need to be able to save the answers as a variable the User names, such as the example and let the user be able to use the variables later.
the program basically has a random number generating, and I want to ask the user to try to guess the number, and keep guessing until the number is right. In addition to this, I need to put in extra conditions for too high or too low by 10. So for example, if they user guesses a number and its off by more than 10, then it prints that they guessed too high, and if its below 10 they guessed too low.
import java.util.*; public class RandomNum { public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
[code].....
Modify the program to keep the user trying to guess the number till he/she gets it right, and stop once you guess the right number.Too high, high, too low, too low( If it's off by more than 10 = way too high, if its less than 10, way too low)
my task is to add a few functions to an example calculator. I managed to add a divide button but I simply can't figure out how to add a working Pi and reciprocal function.
package newjavaproject; import java.awt.*; import java.awt.event.*; import java.applet.*; public class CalculateurNC extends Applet {
import javax.swing.JOptionPane; public class Calculator { public static void main ( String args[] ) { double n1 = Double.parseDouble(JOptionPane.showInputDialog(" Enter first number: ")); double n2 = Double.parseDouble(JOptionPane.showInputDialog(" Enter second number: ")); String x = JOptionPane.showInputDialog("Enter operator: "); double result;
[code].....
Write a program that mimics a calculator. The program will need to accept as input two numeric double values, and accept the operation to be performed as the third input. The operation to be performed will be input in the form of the character representing the java operator for the operation to be performed (i.e + for addition, - for subtraction, * for multiplication, / for division, or % for modulus). Once the program has read these 3 inputs it should output the numbers, the operator, and the result. (For division, if the denominator is zero, the program will output an appropriate message (i.e division by zero is an invalid operation). Please use the JOptionPane class for both accepting the required inputs and for the required output demonstrated below.Some sample output may look as follows:
I am trying to make a calculator using Java GUI. I've managed to make an ActionListener and add it to a button, but I've made an error in my code that I'm unsure of how to solve. Because of how I've written the code, only one number can be placed in the text field. For example, the an ActionListener for the three button on the calculator was added to the button, but no matter how many times the user presses the button, only one 3 will appear in the text field. The code is below:
import javax.swing.*;//import the packages needed for gui import java.awt.*; import java.awt.event.*; public class Calculator { public static void main(String[] args) { JFrame window = new JFrame("Window");//makes a JFrame window.setSize(300,350);
[code].....
As you can see, because the compiler forces the String variable to be final, so when the user presses the button, the code simply shows how a space character and three character would look like, because the String variable can't change. How do I write my code so that every time the user presses the button, a character is added to the text field?
Why I am getting errors for this program I (tried) to write. I am new to java.
import java.util.Scanner; public class TheBarkingLot { public static void main(String args[]) { int n; Scanner input = new Scanner(System.in); System.out.println("How many large dogs are boarding today?");
I've made a calculator that can add, subtract, multiply, and divide, but I still need a clear function and a square root one for it. I've tried going on the various calculator tutorials, but they don't work.
And here's my code:
import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Calculator extends JPanel implements ActionListener { private JTextField display = new JTextField("0"); private String button = "789/456*123-0.+="; private double result = 0;
