SwitchCase Statement Programs In Java

To Create Simple Calculator (all arithmetic operation) using Switch Case

import java.util.Scanner;

public class Cal {

public static void main(String[] args) {

   Scanner sc = new Scanner(System.in);

 

    System.out.println("Enter an operator (+, -, *,/)");

    char op=sc.next().charAt(0);

   

   System.out.println("Enter 1stno:\n");

    int firstNumber=sc.nextInt();

   

   System.out.println("Enter 2ndno:\n");

   int secondNumber=sc.nextInt();

    switch(op)

    {

        case '+':

            System.out.println("sum is"+(firstNumber + secondNumber));

            break;

        case '-':

            System.out.println("sub is"+(firstNumber - secondNumber));

            break;

         case '*':

            System.out.println("mult is"+(firstNumber * secondNumber));

            break;

        case '/':

            System.out.println("mod is"+(firstNumber / secondNumber));

            break;

        // operator doesn't match  (+, -, *, /)

        default:

            System.out.println("invalid operator");

 }

}

}

To check vowel or consonant using switch case

import java.util.Scanner;

public class Vow {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

System.out.println("Enter any alphabet: ");

char ch=sc.next().charAt(0);

 switch(ch)

    {

        case 'a':

            System.out.println("Vowel");

         break;

        case 'e':

            System.out.println("Vowel");

            break;

        case 'i':

            System.out.println("Vowel");

            break;

        case 'o':

            System.out.println("Vowel");

            break;

        case 'u':

            System.out.println("Vowel");

            break;

        case 'A':

            System.out.println("Vowel");

            break;

        case 'E':

            System.out.println("Vowel");

            break;

        case 'I':

            System.out.println("Vowel");

            break;

        case 'O':

            System.out.println("Vowel");

            break;

        case 'U':

            System.out.println("Vowel");

            break;

    default:

            System.out.println("Consonant");

    }

}

}

To print number of days in a month using switch case

import java.util.Scanner;

public class B {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

System.out.println("Enter month number(1-12): ");

 int month=sc.nextInt();

switch(month)

    {

        case 1:

            System.out.println("31 days");

            break;

        case 2:

            System.out.println("28/29 days");

            break;

        case 3:

            System.out.println("31 days");

            break;

        case 4:

            System.out.println("30 days");

            break;

        case 5:

            System.out.println("31 days");

            break;

        case 6:

            System.out.println("30 days");

            break;

        case 7:

            System.out.println("31 days");

            break;

        case 8:

            System.out.println("31 days");

            break;

        case 9:

            System.out.println("30 days");

            break;

        case 10:

            System.out.println("31 days");

            break;

        case 11:

            System.out.println("30 days");

            break;

        case 12:

           System.out.println("31 days");

            break;

        default:

            System.out.println("Invalid month! Please enter month number between 1-12");

 }

}

}

To check Even or Odd number using switch case

 import java.util.Scanner;

public class Check {

public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

 System.out.println("enter number\n");

int num=sc.nextInt();

switch(num % 2)

    {

        /* If n%2 == 0 */

        case 0:

            System.out.println("Number is Even");

            break;

        /* Else if n%2 == 1 */

        case 1:

            System.out.println("Number is Odd");

            break;

    }

}

}

To print day of week using switch case

import java.util.Scanner;

public class C {

public static void main(String[] args) {

   Scanner sc = new Scanner(System.in);

   System.out.println("Enter week number(1-7): ");

    int week=sc.nextInt();

    switch(week)

    {

        case 1:

            System.out.println("Monday");

            break;

        case 2:

            System.out.println("Tuesday");

            break;

        case 3:

            System.out.println("Wednesday");

            break;

        case 4:

            System.out.println("Thursday");

            break;

        case 5:

            System.out.println("Friday");

            break;

        case 6:

            System.out.println("Saturday");

            break;

        case 7:

            System.out.println("Sunday");

            break;

        default:

            System.out.println("Invalid week! Please enter week number between 1-7.");

          }

}

}

  

Write a  program to input marks of five subjects Physics, Chemistry, Biology, Mathematics and Computer, calculate percentage and grade according to given conditions using switch case
If percentage >= 90% : Grade A
If percentage >= 80% : Grade B
If percentage >= 70% : Grade C
If percentage >= 60% : Grade D
If percentage >= 40% : Grade E
If percentage < 40% : Fail

import java.util.Scanner;

public class A {

public static void main(String[] args) {

  Scanner sc = new Scanner(System.in);

  int n;

  float per;

 System.out.print("Enter physics:\n ");

  int phy = sc.nextInt();

  System.out.print("Enter chemistry \n ");

  int chem = sc.nextInt();

   System.out.print("Enter biology \n ");

  int bio = sc.nextInt();

  System.out.print("Enter math \n ");

  int math = sc.nextInt();

  System.out.print("Enter computer \n ");

  int comp = sc.nextInt();

  /* Calculate percentage */

 per = (phy + chem + bio + math + comp) / 5;

System.out.print("Percentage ="+ per);

    if(per >= 90)

    {

        n=1;

    }

    else if(per >= 80)

    {

      n=2;

    }

    else if(per >= 70)

    {

       n=3;

 }

    else if(per >= 60)

    {

      n=4;

    }

     else if(per >= 40)

    {

      n=5;

    }

    else

    {

      n=6;

    }

    switch(n)

    {

        case 1:

       System.out.print("\nGrade A");

        break;

        case 2:

       System.out.print("\nGrade B");

        break;

        case 3:

       System.out.print("\nGrade C");

        break;

        case 4:

       System.out.print("\nGrade D");

        break;

        case 5:

       System.out.print("\nGrade E");

        break;

        default:

        System.out.print("\nFail");

   }

 }

}