Find Area Of Triangle / Square / Rectangle Or Trapezoid
May 19, 2014
I started with finding the area of a triangle, but now I'm trying to ask a user what kind of shape they want the area for, then ask questions to get the area. I can't figure out how to take the shape a person types to go to a certain case. It also says shape hasn't been initialized. I don't know how to do that.
import java.util.Scanner;
public class TriangleArea {
static Scanner sc = new Scanner(System.in);
public static void main(String[] args){
char shape;
String text = "Do you want to find the area of a triangle, square, rectangle, or trapezoid?";
System.out.print("Text");
switch(shape){
[code]....
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Mar 3, 2015
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...
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Dec 28, 2014
I'm doing a problem where the area of a triangle is returned (if valid). However, I want to return a message (i.e. 'triangle is not valid) if the triangle is invalid.
I'm not sure how to go about to doing this as my method (called area) will only let me return doubles. Possible to return a string in an else within my area method?
public class MyTriangle {
public static void main(String[] args) {
//triangle is valid if the sum of any two sides is bigger than the third
System.out.println(isValid(3, 4, 5));
System.out.println(area(543, 4, 5));
[Code] ...
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Nov 21, 2014
import java.util.Scanner;
public class justin10a
{
public static void main(String [] args)
{
int n;
n = getSize();
[Code] .....
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Sep 2, 2014
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
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Sep 1, 2014
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] ....
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Sep 28, 2014
I am also having trouble with another program.
Java Code:
import javax.swing.JOptionPane;
import java.util.*;
import java.text.DecimalFormat;
import java.util.StringTokenizer;
public class ShelbyHarms_3_03 {
public static void main (String [] args) {
double a, b, c; //Input sides of triangle
double x; //Perimeter of triangle
double area; //Area of triangle
[Code] .....
Here are the errors:
ShelbyHarms_3_03.java:39: error: variable x might not have been initialized
JOptionPane.showMessageDialog(null, formatter.format(x));
^
ShelbyHarms_3_03.java:42: error: variable area might not have been initialized
JOptionPane.showMessageDialog(null, formatter.format(area));
^
2 errors
Am I not formatting the decimal format right?
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Feb 24, 2014
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] ....
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Apr 4, 2015
I need to create a program in Java for below question
"Prompt user for three sides of triangle and determine if it is valid triangle and then compute area"
With code and Sudo Code for above question.
I am using Netbean compiler.
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Mar 19, 2014
I was suppose to create a simple Java program for calculating the area of a rectangle (height * width). Then check the user’s input, and make sure that they enter in a positive integer, and letting them try again if they enter in a negative number. (I'm not sure how to get them to try again.
I am suppose to use an "if" statements and indeterminate loops to achieve the solution. The program will have the following requirements:
1. Ask the user to enter in both a height and width (as an integer)
2. If the user enters in a negative number, display an error
3. If the user enters in a negative number, give them another chance to enter in the correct value
4. Calculate the area and display to the screen once two positive integers have been entered.
import java.util.Scanner;
public class RectangleAreaCalc
{
public static void main(String[] args)
{
int length;
int width;
int area;
[Code] ....
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Feb 16, 2015
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.
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Jul 3, 2014
I have a program i m not sure how to implement :
(Square numbers) Find the first ten square numbers that are greater than Long.MAX_VALUE . A square number is a number in the form of n 2 . For example, 4, 9, and 16 are square numbers. Find an efficient approach to run your program fast.
I found two ways of solving this but i think both are way inefficient :
-A square number can be divided in lesser square numbers :
what's the square of 36 ? 36 is 2 * 3 * 2 * 3 => 4 * 9 => square is 2 * 3
-second option is to estimate a number and increase it or decrease it based on how close that number * number is to the BigInteger starting number , as as it gets closer the delta gets smaller until it gets to 1
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Aug 12, 2014
If you aren't familiar with the euler problem 67, you are given an array that is a set of numbers in a triangle. Like this
3
7 4
2 4 6
8 5 9 3
and you have to find the maximum path, which for this one is
(3)
(7) 4
2 (4) 6
8 5 (9) 3
I have solved this problem iteratively with the code below
depth = depth-2;
while (depth >=0) {
for (int j = 0; j <= depth; j++) {
values[depth][j] += Math.max(values[depth+1][j], values[depth+1][j+1]);
}
depth -= 1;
}
depth is a variable for the row in the triangle. My problem is that i need the solution to be recursive and i am having trouble doing this. So far i have
public static int findMax(int[][] array,int depth) {
if (depth==0)
return array[0][0];
else if
}
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Sep 22, 2014
Write a program that prompts the user to enter an integer m and find the smallest integer n such that m * n is a perfect square. (Hint: Store all smallest factors of m into an array list. n is the product of the factors that appear an odd number of times in the array list. For example, consider m = 90, store the factors 2, 3, 3, 5 in an array list. 2 and 5 appear an odd number of time in the array list. So, n is 10.)
so far my program is just like this.
import java.lang.Math;
import java.util.Scanner;
public class PerfectSquare {
public static void main(String[] args) {
Scanner m = new Scanner(System.in);
int Fint;
[Code] .....
how do i make the program find the smallest integer n?
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May 4, 2014
Im doing a problem where i have to find the area of four triangles split by two intersecting lines, All i have are the points for x1, y1, x2, y2, x3, y3, x4, y4. My question is how do i find where these two lines intersect?
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Aug 31, 2014
I'm trying to create a cursor for a game that moves square by square. While it will move to the next square, though, it leaves the image of the previous cursor on the last square it was on.
As a visual explanation, this is what the program looks like on launch:
This is what it's suppose to look like after you press the right arrow key once (made by forcibly changing launch coordinates):
And this is what it actually looks like after you press the right arrow key once:
Here is the code for the program:
package cursortest;
import javax.swing.*;
import java.awt.*;
import javax.imageio.*;
import java.io.*;
import java.awt.event.*;
public class CursorTest extends JPanel implements KeyListener{
[Code] ......
I'm fully aware that I could just use g.clearRect on the area and remove it for sure, but I know for a fact I shouldn't have to as I have another program I made a long time ago that tried to do something similar without needing to resort to that.
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Feb 20, 2014
How would I compare the square of the square root of any number. The difference in these values is due to the rounding error in Java.
Example: Enter number 2
The answer I should get is: 2.000000000000004
Round off error: -4.440892
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Nov 25, 2014
I'm having a small issue with my output on my code. here is what my output is: The magic value for your square is 34, which means that every row, column and diagonal of your square must add up to that number.
Please enter the 4 values for row 0, separated by spaces: 1 2 15 16
Please enter the 4 values for row 1, separated by spaces: 13 14 3 4
Please enter the 4 values for row 2, separated by spaces: 12 7 10 5
Please enter the 4 values for row 3, separated by spaces: 8 11 6 9
Checking square for problems:
DIAG: VALID
ROWS: VALID
COLS: VALID
RANG: VALID
MAGIC: No
MAGIC should be YES. However i keep getting it saying no.This is the correct output..The magic value for your square is 34, which means that every row, column and diagonal of your square must add up to that number.
Please enter the 4 values for row 0, separated by spaces: 1 2 15 16
Please enter the 4 values for row 1, separated by spaces: 13 14 3 4
Please enter the 4 values for row 2, separated by spaces: 12 7 10 5
Please enter the 4 values for row 3, separated by spaces: 8 11 6 9
Checking square for problems:
DIAG: VALID
ROWS: VALID
COLS: VALID
RANG: VALID
MAGIC: YES
Here is my code..
import java.util.Scanner;
public class pdonahue_Magic {
public static void main(String args[]) {
int[][] theSquare = new int[4][4];
Scanner s = new Scanner(System.in);
System.out.println.
("The magic value for your square is 34, which means that every row, column and diagonal of your square must add up to that number.");
System.out.print("Please enter the 4 values for row 0, separated by spaces: ");
theSquare[0][0] = s.nextInt();
theSquare[1][0] = s.nextInt();
theSquare[2][0] = s.nextInt();
theSquare[3][0] = s.nextInt();
[code]....
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Oct 17, 2014
Do I want to make something like this:
*****
*.....*
*.....*
*.....*
*****
I am stuck, I have made a code that creates this and don't know how to complete it.
*****
* *
* *
* *
*****
Code:
class Main {
public static void main( String args[] ) {
System.out.print("#Enter number of stars :");
int stars = BIO.getInt();
[Code] ....
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May 14, 2009
This is a mathematical problem. I got one of the equations I need to compute down to
n^(1/6)
Or the 6th root of n.
Now the Java code I have for this is as follows, since Java has no nth root function I'm raising it to a power of a 1/6.
System.out.println(Math.pow(64.0, 1/6));
Now, the only thing it will print is 1.0
However the 6th root of 64 is 2!!!!
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May 10, 2015
I have to create a square matrix that has a min and max value as well as a size value which is given a integer value in the main method. The matrix has to be filled with random values. Also I have to add that matrix to another one in an addMatrix method and I have to subtract both in a subMatrix method. These are the requirements:
Methods:
Constructor() - receives the row and col size for myMatrix and a max and min values for range of random fill values for the matrix.
RandFill() - fills matrices with random numbers
addMatrix() - receives a matrix object. adds its myMatrix with the received object's myMatrix. The result is placed in this object's myResultMatrix.
subMatrix() - subtracts both matrices
I typed up this code but I'm not sure about some parts of it and I would creating min and max values in the Random method and in the main printing the separate 2 matrices and adding and subtracting them:
import java.util.*;
public class SquareMatrix2 {
public int size;
public int myMatrix [][];
public int myResultMatrix;
public int [][] ResultStatus;
[Code] ....
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Sep 7, 2014
Why does my program write that i have problem in Timer?
public class Ball extends JPanel implements ActionListener {
Timer timer = new Timer (3, this);
int x = 0, y = 0, aX = 2, aY = 2;
public void PaintComponent(Graphics g){
Graphics2D g2 = (Graphics2D) g;
[Code] ....
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May 3, 2014
I aim to create a solid square using this:
public class asteriskSquare {
public static void main(String[] args) {
for (int x = 1; x <= 4; x++){
for (int y = 1; y <= 4; y++){
System.out.println("+");
}
System.out.println("+");
}
}
}
All I'm getting is a single column of "+".
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Jan 16, 2014
I need to build the triangle like below. How to solve this using loops.
*
* *
* * *
* * * *
* * * * *
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Oct 29, 2014
A triangle is defined by the x- and y- coordinates of its three corner points. Compute the following the following properties of a given triangle: the lengths of all sides, the angles at all corners, the perimeter and the area. The program must prompt a user for the point coordinates. I have created a class Triangle and a class TriangleSimulator, I am stuck and can't figure out why my program won't run correctly.
import java.util.Scanner;
public class Triangle {
Scanner in = new Scanner(System.in);
private int x1;
private int x2;
private int x3;
[Code] ....
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Nov 25, 2014
class triangle
{
public static void main (String[] args)
{
System.out.println("Provide three side lengths - 000 to terminate.");
int a = In.getInt();
int b = In.getInt();
int c = In.getInt();
[code]....
My problem is that when I enter 5,2,5 it should be isosceles and acute but it comes out as isosceles and obtuse, and when I type 5,5,5 it comes out equilateral and right. The only one that works is if I enter 3,5,4 it will come out as scalene and right. I been at this for a while and my math looks correct.
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