Question

In Java

Exercise #2: (Java) Design and implement a program (name it ComputeAreas) that defines four methods as follows:

Method squareArea (double side) returns the area of a square.

Method rectangleArea (double width, double length) returns the area of a rectangle.

Method circleArea (double radius) returns the area of a circle.

Method triangleArea (double base, double height) returns the area of a triangle.

In the main method, test all methods with different input value read from the user. Document your code and properly label the input prompts and the outputs as shown below.

Sample run:

Square side:    5.1

Square area:    26.01

Rectangle width:      4.0

Rectangle length:     5.5

Rectangle area:       22.0

Circle radius:        2.5

Circle area:          19.625

Triangle base:        6.4

Triangle height:      3.6

Triangle area:        11.52

Exercise #2: Design and implement a program (name it ComputeAreas) that defines four methods as follows: Method squareArea (double side) returns the area of a square. Method rectangleArea (double width, double length) returns the area of a rectangle. Method circleArea (double radius) returns the area of a circle. Method triangleArea (double base, double height) returns the area of a triangle. In the main method, test all methods with different input value read from the user. Document your code and properly label the input prompts and the outputs as shown below. Sample run: Square side: 5.1 Square area: 26.01 Rectangle width: 4.0 Rectangle length: 5.5 Rectangle area: 22.0 Circle radius: 2.5 Circle area: 19.625 Triangle base: 6.4 Triangle height: 3.6 Triangle area: 11.52

Answer 1

file:

import java.util.Scanner;
public class ComputeAreas {

public double circleArea(double radius)
{
double pi = 3.14;
double result = pi * radius * radius;
return result;
}
public double squareArea(double side)
{
double result = side * side;
return result;
}
public double rectangleArea(double width,double length)
{
double result = width * length;
return result;
}
public double triangleArea(double base, double height)
{
double result = (base * height)/2;
  
return result;
}
  
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
ComputeAreas a = new ComputeAreas();
  
System.out.print("Square side: ");
  
double s = sc.nextDouble();
double result = a.squareArea(s);
System.out.println("Square area: "+result);
  
System.out.print("Rectangle width: ");
double w = sc.nextDouble();
System.out.print("Rectangle length: ");
double l = sc.nextDouble();
result = a.rectangleArea(w, l);
System.out.println("Rectangle area: "+result);
  
System.out.print("Circle Radius: ");
double r = sc.nextDouble();
result = a.circleArea(r);
System.out.println("Circle area: "+ result);
  
System.out.print("Triangle base: ");
w = sc.nextDouble();
System.out.print("Triangle height: ");
double h = sc.nextDouble();
result = a.triangleArea(w,h);
System.out.println("Triangle area: "+result);
  
}
}

Output:

Square side: 2.0                                                                                                                 

Square area: 4.0                                                                                                                 

Rectangle width: 2.0                                                                                                             

Rectangle length: 3.0                                                                                                            

Rectangle area: 6.0                                                                                                              

Circle Radius: 2.0                                                                                                               

Circle area: 12.56                                                                                                               

Triangle base: 2.0                                                                                                               

Triangle height: 4.0                                                                                                             

Triangle area: 4.0