QN005. Write a program which demonstrates the use of switch statement.

---

1. Objective

To be tested for quality against a list of values and the variable being switched on is to checked for each case.

2. Theory

1. Java Switch Statement
   

   The Java switch statement executes one statement from multiple condition. It is like if-else-if ladder statement.
   #This is how it works
   -> The switch expression is evaluated once.
   -> The value of the expresion is compared with the values for each case.
   -> If there is a match, the associated block of code is executed.
   -> The break and default keywords are optional.

2. Scanner class in Java
   

   Scanner class in Java is found in the java.util.package. Java provides various way to read input from the keybord, the java.util.Scanner class is one of them.
   The Java Scanner class is widely used to parse text from strings and primitive types using regular expression. It is the simplest way to get input in Java. By the help of Scanner in Java, we can get input from the user in primitive types such as int, long, double, float etc.
   The Java Scanner class provides nextxxx() methods to return the type of value such as nextInt(), nextByte(), next(), nextLine(), nextDouble() etc.

3. Source Code

import java.util.Scanner;
public class Qn005{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.println("Enter a number to display the name of a day of week: ");
int choice = input.nextInt();
switch(choice)
{
case 1:
System.out.println("Sunday");
break;
case 2:
System.out.println("Monday");
break;
case 3:
System.out.println("Tuesday");
break;
case 4:
System.out.println("Wednesday");
break;
case 5:
System.out.println("Thursday");
break;
case 6:
System.out.println("Friday");
break;
case 7:
System.out.println("Saturday");
break;
default:
System.out.println("Invalid input");
}
}
}


4. Output

Enter a number to display the name of a day of week: 7
Saturday

5. Conclusion

In this way, I would like to conclude that, if-else-if ladder statement and switch works in the same way. But if we have a fixed case value we can use switch for that problem.