Question

HI. I have been trying to run my code but I keep getting the following error. I can't figure out what I'm doing wrong. I also tried to use else if to run the area of the other shapes but it gave me an error and I created the private method.

Exception in thread "main" java.util.InputMismatchException

at java.base/java.util.Scanner.throwFor(Scanner.java:939)

at java.base/java.util.Scanner.next(Scanner.java:1594)

at java.base/java.util.Scanner.nextInt(Scanner.java:2258)

at java.base/java.util.Scanner.nextInt(Scanner.java:2212)

at project2.areacalculation.main(areacalculation.java:26)

My code is below

package project2;

import java.util.Scanner;

public class areacalculation {

private static final int S = 0;

private static final int R = 0;

private static final int C = 0;

public static void main(String[] args) {

try (Scanner scan = new Scanner(System.in)) {

System.out.println("Please enter a letter (S,R,C): ");

System.out.println("\tS -- Square");

System.out.println("\tR -- Rectangle");

System.out.println("\tC -- Circle");

//Wait for user input

int option = scan.nextInt();

if (option==S); {

//Calculate the area of a Square

System.out.println("Please enter the length of the square");

double l = scan.nextDouble();

//Area calculation

double area = l*l;

System.out.println("Area: " + area);

}

{

if(option==R); {

//Calculate the area of a Rectangle

System.out.println("Please enter the lenghth of the rectangle");

double l = scan.nextDouble();

System.out.println("Please enter the width of the rectangle");

double w = scan.nextDouble();

//Area calculation

double area = l * w;

System.out.println("Area: " + area);

}

{if(option==C); {

//Calculate the area of a Circle

System.out.println("Please enter the radius of the circle");

double r = scan.nextDouble();

double area = Math.PI * r * r;

System.out.println("Area : " + area);

}

}

}

}

}

}

Answer 1

import java.util.Scanner;

public class areacalculation {

   private static final char S = 'S';

   private static final char R = 'R';

   private static final char C = 'C';

   public static void main(String[] args) {

       try (Scanner scan = new Scanner(System.in)) {

           System.out.println("Please enter a letter (S,R,C): ");

           System.out.println("\tS -- Square");

           System.out.println("\tR -- Rectangle");

           System.out.println("\tC -- Circle");

           // Wait for user input

           char option = scan.next().charAt(0);

           if (option == S) {

               // Calculate the area of a Square

               System.out.println("Please enter the length of the square");

               double l = scan.nextDouble();

               // Area calculation

               double area = l * l;

               System.out.println("Area: " + area);

           }

           else if (option == R) {

               // Calculate the area of a Rectangle

               System.out.println("Please enter the lenghth of the rectangle");

               double l = scan.nextDouble();

               System.out.println("Please enter the width of the rectangle");

               double w = scan.nextDouble();

               // Area calculation

               double area = l * w;

               System.out.println("Area: " + area);

           }

           else if (option == C) {

               // Calculate the area of a Circle

               System.out.println("Please enter the radius of the circle");

               double r = scan.nextDouble();

               double area = Math.PI * r * r;

               System.out.println("Area : " + area);

           }
       }

   }

}

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