Java program to find area and perimeter of different shapes.

 Program:

package ar.peri;

 import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class ArPeri {

   

    public static void main(String[] args) throws IOException {

      

       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

      

       System.out.println("Enter your choice");

       System.out.println("1. To find Area & Perimeter of a Rectangle");

       System.out.println("2. To Find Area & Perimeter of a Square");

       System.out.println("3. To Find Area & Perimeter of a Circle");

       System.out.println("4. To Find Area & Perimeter of a Equilateral Triangle");

       System.out.println("5. To Find Area & Perimeter of a  Parallelogram");

       System.out.println("6. To Find Area & Perimeter of a  Rhombus");

    

       int choice=Integer.parseInt(br.readLine());

      

       switch(choice){   

case 1:   

    //code to be executed for rectangle;

    System.out.println("You have selected to Find Area & Perimeter of a  Rectangle");

    System.out.print("Enter the value os side a ");

    int a =Integer.parseInt(br.readLine());

    System.out.print("Enter the value os side b ");

    int b =Integer.parseInt(br.readLine());

    int p1=2*(a+b);

    int area1=a*b;

    System.out.println(" Area = "+ area1 + " & Perimeter of a  Rectangle="+p1);

 break; 

case 2:   

 //code to be executed for square;  

    System.out.println("You have selected to Find Area & Perimeter of a  Square");

    System.out.print("Enter the value of side c ");

    int c =Integer.parseInt(br.readLine());

    int p2=4*(c);

    int area2=c * c;

    System.out.println(" Area = "+ area2 + " & Perimeter of a  Square="+p2);

 break;   

case 3:   

 //code to be executed for circle;  

  System.out.println("You have selected to Find Area & Perimeter of a Circle"); 

  System.out.print("Enter the radius ");

    int r =Integer. parseInt(br.readLine());

    float p3=(float) (2.0*3.14* r) ;

    float area3=(float) (3.14 * r* r);

    System.out.println(" Area = "+ area3 + " & Perimeter of a  Circle="+p3);

 break;   

 case 4:   

 //code to be executed for Equilateral Triangle ;  

      System.out.println("You have selected  to Find Area & Perimeter of a Equilateral Triangle");

      System.out.print("Enter the side ");

      int s =Integer. parseInt(br.readLine());

      int p4= 3* s ;

      float area4=(float)((1.0/4.0)*(Math.sqrt(3.0))* s*s );

      System.out.println(" Area = "+ area4 + " & Perimeter of a  Equilateral Triangle="+p4);

 break; 

 case 5:   

 //code to be executed for Parallelogram ;

     System.out.println("You have selected to Find Area & Perimeter of a  Parallelogram");

     System.out.print("Enter the side  a");

     int s1 =Integer. parseInt(br.readLine());

     System.out.print("Enter the side  b");

     int s2 =Integer. parseInt(br.readLine());

     int p5=2*(s1 + s2);

     int area5= s1 * s2;

     System.out.println(" Area = "+ area5 + " & Perimeter of a  Parallelogram="+p5);

     break;   

 case 6:   

 //code to be executed for   Rhombus; 

     System.out.println("You have selected to Find Area & Perimeter of a  Rhombus");

     System.out.print("Enter the side  a");

     int a6 =Integer. parseInt(br.readLine());

     System.out.print("Enter the side  height");

     int h =Integer. parseInt(br.readLine());

     int area6=a6 * h;

     int p6= 4 * a6;

      System.out.println(" Area = "+ area6 + " & Perimeter of a  Rhombus="+p6);

 break;  //optional 

 

default:    

  System.out.println("Please select your choice between 1-6");

}   

    }

   

}

OUTPUT 1:

OUTPUT 2: