Question

Write a Java program that prompts the user to enter a number

representing a geometric shape. Options are 1 for square, 2 for

rectangle, and 3 for right triangle. According to the user input, the

program will collect either 1, 2 or 3 values from the user

representing the lengths of the shape sides. The user is

responsible for ensuring the 3 sides of the triangle represent a

right triangle. The program will print the perimeter of the shape.

Use method overloading for the perimeter method.

Hint

Square:

perimeter = 4 x side

Rectangle:

perimeter = 2 x (side1 + side2)

Right Triangle: perimeter = side1 + side2 + hypotenuse

Answer 1

import java.util.Scanner;

//class efinition
public class Perimeter {
  
   //definition of findPerimeter method by method overload
   //findPerimeter definition for square
   public static int findPerimeter(int side){
       int perimeter;
       perimeter = 4 * side;
       return perimeter;
   }

   //findPerimeter definition for rectangle
   public static int findPerimeter(int length,int breadth){
       int perimeter;
       perimeter =2 *( length + breadth);
       return perimeter;
   }
  
   //findPerimeter definition for right triangle
   public static int findPerimeter(int base,int height,int hypotenuse){
       int perimeter;
       perimeter = base + height + hypotenuse;
       return perimeter;
   }
  
   //main function definition
   public static void main(String[] args) {
      
       //create scanner class to take user input
       Scanner sc = new Scanner(System.in);
      
       //define variables for shape and perimeter
       int shape , perimeter = 0;
      
       //prompt to user and take the user choice
       System.out.println("Please choose a shape : \n1. Square \n2. Rectangle \n3. Right Triangle");
       shape = sc.nextInt();
      
       //switch case to execute different blocks for different choices made by user
       switch(shape){
       case 1:
           int s;
           System.out.println("Enter square side :");
           s = sc.nextInt();
           perimeter = findPerimeter(s);
           break;
       case 2:
           int l,b;
           System.out.println("Enter 2 sides of rectangle :");
           l = sc.nextInt();
           b= sc.nextInt();
           perimeter = findPerimeter(l, b);
           break;
       case 3:
           int s1,s2,h;
           System.out.println("Enter 3 sides of rectangle :");
           s1 = sc.nextInt();
           s2= sc.nextInt();
           h= sc.nextInt();
           perimeter = findPerimeter(s1,s2,h);
           break;
       default:
           System.out.println("Invalid Input !");
       }
      
       //Print perimeter if calculated
       if(perimeter>0)
           System.out.println("The perimeter is : " + perimeter);
   }

}