Question

Find the error in the following java code and explain how to correct it (val is a variable of type int):

 switch (val) {

      case 1:  

           System.out.println ("The number is 1");

      case 2: 

           System.out.println ("The number is 2");

     default:

           System.out.println ("The number is not 1 or 2");

           break;

Answer 1

In you java code,case 1 and case 2 does not have break statement,therefore it results in executing all three printing statements.

Below is the corrected code:

import java.util.Scanner;
public class Main
{
   public static void main(String[] args) {
   //sample value of variable val i.e 1.
   Scanner scn = new Scanner(System.in);
   //taking user input and storing in val.
   int val = scn.nextInt();
   //checking using switch case
   //whether val is 1 or 2 or other number.
       switch (val) {
case 1:
System.out.println ("The number is 1");
//included break statement for case 1.
break;
case 2:
System.out.println ("The number is 2");
//included break statement for case 2.
break;
default:
System.out.println ("The number is not 1 or 2");
break;
       }
   }
}

Refer to the screenshot attached below to better understand the code and indentation:


Output:
when val = 1.

when val = 2.

when val is other than 1 or 2.

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Thank you.