I'm starting with my version of very basic program: calculating area of circle. And of course it doesn't get well. My question: what is wrong in this code?
public class circleAre{
double radious;
void putData(double radi){
radi = radious;
[Code] .....
package areatest;
import javax.swing.JOptionPane;
public class AreaTest {
public static double areaTriangle (double length, double width){ //How to calculate the area of a triangle
return .5f * length * width;
[Code] .....
When I try to get the area of a rectangle it gives me 9 no matter what input I give it. When I try to get the area of a triangle it gives me .5 no matter what input I give it. Same with the circle but it always gives me 12.56370...
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] .....
Here is the code that I wrote out:
//program that calculates the circumference and area of a circle
import java.util.Scanner;
public class circle{
public static void main(String[] args){
Scanner input= new Scanner( System.in);
double r; //declares radius
[Code] .....
And here is what is displayed in the command prompt when I compile my code:
circle.java:17: error: cannot find symbol
r.input.nextdouble();//entered the radius
symbol: method nextdouble()
location: variable input of type Scanner
1 error
What am I doing wrong?
I am able to draw this image using filloaval() but afterwards when i am calculating some area i have to shade that in the figure in some different color
R is fixed to 100 and d lies between 0 to R
My homework is to find the surface area and volume of a cone. I have 2 individual java program for the homework and one them already works.
public class Cone {
Cone() {}
double r, h;
double volume() {
return (1.0 / 3.0) * Math.PI * r * r * h;
[Code] ....
The second one I keep getting error mainCone.java:22: error: reached end of file while parsing
public class Conemain {
public static void main(String [] args) {
Cone = new Cone();
Cone.setR(5);
Cone.setH(8);
[Code] ....
I need fixing the second one in order to find the surface area and the volume for cone.
Basically its a program where a user is prompted to enter the length of all three sides of a triangle and the program calculates the area by herons formula and can tell if the triangle is equilateral or Pythagorean. I am having trouble entering a formula to where all three enter sides cant possibly be a triangle. Here is my Program. Where the '?' is stated.
import java.util.Scanner;
public class Triangle {
public static void main(String[] args){
double a;
double b;
double c;
double s;
double x;
double area;
[Code] ....
Create a program to input the length and width of a rectangle and calculate and print the perimeter and area of the rectangle. To do this you will need to write a Rectangle class and a separate runner class. Your program should include instance variables, constructors, an area method, a perimeter method, a toString method, accessor and mutator methods, and user input. Your runner class should include 3 Rectangle objects. One default rectangle, one coded rectangle, and one user input rectangle. All methods should be tested in the runner class.
This is my code:
import java.util.Scanner;
public class Rectangle {
double length;
double width;
public Rectangle() {
[Code] ...
What have I done??? I have created this program using the few different resources with which I am supplied, but I don't understand the resources.
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.
Write a Java program that calculates the area and volume of a cube, sphere, cylinder, and regular tetrahedron. Your program should obtain the necessary input for each of the objects from the console and output the input, area, and volume of the object. Use appropriate messages to guide the user of your program.
View Replies View RelatedSo in trying to create a circle class, and use the dimensions of that circle (radius, area, etc.) to prove it will equal pie and print (3.141592653589793). This is my code so far it and am getting an error in the last two classes. I know it has to do with Circle(Radius); in the 2nd class but whenever i call upon it, it is assigned to itself. And in the last class im not too sure how to put the B= new b(1,1).
[public class Circle {
private double radius;
public Circle() {
radius = 0;
}
public Circle(double radius) {
this.radius = radius;
[Code] .....
I've been having trouble with this code for about a week and I've finally got it down to one error. Here is the code:
import java.util.Scanner;
public class Triangle {
public static void main (String[] args) {
Scanner Console = new Scanner(System.in);
System.out.print("Please enter the three lengths of your Triangle: ");
double a = console.nextDouble();
[Code] ....
And here is the error:
Triangle.java:30: error: class, interface, or enum expected
} // End class
^
1 error
import java.lang.Math;
public class triangle {
double area; double s;
public double findArea(double sideA, double sideB, double sideC);
{
s= 0.5 *(sideA + sideB + sideC);
area = Math.sqrt(s*(s-sideA)*(s-sideB)*(s-sideC));
[Code] ...
Errors I am getting:
Triangle.java:23: error: class, interface, or enum expected
import java.util.Scanner
^
Triangle.java:25: error: class, interface, or enum expected
public static void main(String[] args) {
[Code] ....
Here is the program I wrote for calculating the circumference of a circle.
//circumference.java
//program that calculates the area and circumference of a circle
import java.util.Scanner; //program uses class scanner
public class circumference{
//main method begins execution of Java application
public static void main(String args[]){
[Code] .....
Even though my code compiles and runs without any errors, the program doesn't calculate the circumference.
I have to write a gui program where I can enter a file name and then it gets displayed in a text area when I click Open. Conceptually, I do not get this. I was thinking of appending the text file into a string or something, but I guess I'm confused on how it all works and how I can open the text file. Not asking for the code, but just a compass or something.
View Replies View RelatedWrite a Java program that calculates the area and volume of a cube, sphere, cylinder, and regular tetrahedron. Your program should obtain the necessary input for each of the objects from the console and output the input, area, and volume of the object. Use appropriate messages to guide the user of your program.
Here what i did, i am not sure if this is what the assignment want, but this is the best method i could come up with
//Khang Le
import java.util.Scanner;
public class InputAreaVolume {
public static void main(String[] args) {
[Code]......
how does the program know to calculate for only one year?
public class Interest2 {
public static void main(String[] args) {
double principal; // The value of the investment.
double rate; // The annual interest rate.
double interest; // The interest earned during the year.
[code]....
I have spent the past 12 hours on it and have gotten no where. I need to create a program that will calculate different tax brackets. I have tried all combinations I can think of and can't get it to work!!! I am literally about to go insane! I need the program to calculate tax will be 1% for anything up to $50000. If the tax is over $50000, you keep that 1% of $50000 and then add the remaining. So for an income in the second range, it would be 1% of $50000, and then 2% of (income - $50000). This then continues for each range.
The problem I'm having is getting it to display the correct interest rates. I am not asking for you to write it for me. I want to learn. But at this point I have exhausted all resources available to me.
import java.util.Scanner;
public class Project3taxinfo {
public static void main(String[] args) {
final double RATE1 = 0.01; //1% tax on the first $50,000
final double RATE2 = 0.02; //2% tax on the amount over $50,000 up to $75,000
final double RATE3 = 0.03; //3% tax on the amount over $75,000 up to $100,000
final double RATE4 = 0.04; //4% tax on the amount over $100,000 up to $250,000
final double RATE5 = 0.05; //5% tax on the amount over $250,000 up to $500,000
final double RATE6 = 0.06; //6% tax on the amount over $500,000
[code]....
I am having a problem with my program. I can't get my program to calculate properly. Everything compiles and run but its just giving me a wrong answer. I am suposse to get 115.50 but instead I am getting .30...
order.java
public class Order
{
double salesTaxRate; //initializing a variable for the sales tax rate.
double subTotal; //initializing a varliable for the sub total.
double shippingCost; //initializing a variable for shipping cost.
double salesTax; //initializing a variable for sales tax.
double totalCost; // initializing a variable for totale cost.
[Code] ....
Assume the tanker is a cylinder of length 19.35 feet and volume 1320 gallons. What is the diameter in feet of the tanker truck? To solve this problem, write a Java program to calculate the diameter. For full credit, your Java application must follow these specifications.
1. The program must interactively input the capacity of the tanker in gallons and its length in feet. This should be done in the main method of your Tester class.
2. The input data should then be used to construct a TankerTruck object. You will need to write the TankerTruck class.
3. A TankerTruck method should be used by main to calculate the resulting diameter of the truck in feet.
4. Your program should use the standard Java constant for the math constant PI.
5. The output should be displayed using fixed-point notation, rounding to one decimal place of precision
//calculates rainfall quarterly program
import java.util.Scanner;
public class SophiaKeyProgram1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
int numQuarter; //number of quarters in a year
double rainfall=0; //the amount of rain
[Code] ....
I have everything but the min and max numbers.
Write method distance, which calculates the distance between two points (x1, y1) and (x2, y2). All numbers and returned values should be of type double. Incorporate this method into an program that enable the user to enter the coordinates of the points, then calculate and display the distance by calling the method –distance.
I've tried numerous times to make it work and I'm on the right path, however I'm missing some things in the code to make my results look like this later on, which I've attached onto this post.
write a program that calculates the change due to a customer by denomination; that is, how many pennies, nickels, dimes, etc. are needed in change. The input is to be purchase price and the size of the bill tendered by the customer($100, $50, $20, $10, $5, $1).
View Replies View Relatedhaving some trouble doing this. Here are the requirements:
1)Write a program using loop and break to calculate the value of PI.
2)You can use the following equation to calculate PI. PI=4/1-4/3+4/5-4/7+4/9-4/11+4/13 etc.. The program shouldn't loop until the criteria is satisfied.
3)The criteria is the value of PI you get is very close to the “real” value (3.1415926), meaning that their difference
should be smaller than a very small numeric number, e.g., 0.0001).
4)The control structures you may need for this program are loop, if-else, and unlabeled break.
5)The output should have the format: for each iteration, it has iteration number and the corresponding value of PI until that
iteration. The last line would be the final value of PI.
Here is my code so far:
package ids;
public class IDS {
public static void main(String[] args) {
double pi = 0;
for(int i=1; i<=100000; i++){
if ((i%2)==0){
pi+=(4/(2*i-1));
[code]...
The end result is when I print the total it comes out to be 0. Trying to solve this
package pay;
import java.util.*;
public class manager
{
public manager(String string, int i, String type) {
[Code] ......
I have to use methods and loops to code this program. Cannot use any java set or any built in java shortcuts!
import java.util.Scanner;
public class setPractice {
public static Scanner kbd;
public static final int MAXSIZE = 20;
public static void main(String[] args) {
kbd = new Scanner(System.in);
[Code] .....
This is the input I put in my code and this is the output:
How many numbers will be in the 1st set: 3
Enter list of integers for 1st set:
34
2
56
The ascending order for 1st is:
2
34
56
How many numbers will be in the 2nd set: 4
Enter list of integers for 2nd set:
56
2
33
6
The ascending order for the 2nd set is:
2
6
33
56
The intersection of the two sets is: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
The difference of A-B is: