Question

The CASE structure is a selection structure, however not all selection structures may be represented as CASE. Give an example of a selection problem that may be solved using the CASE structure and another selection problem that CANNOT be represented by the CASE structure. Type your response in the space provided (after you have created a thread). Indicate which problem CAN and CANNOT be represented by CASE Provide an explanation why each of your suggested problem fits the appropriate category.

Answer 1

solution:

CASE Structure(Switch Case) is one of the selection control approach we can use instead of if...else statement

Both Switch and if..else can bes used for making decisions

It will execute the program according to the values

General Form

switch(expression)

{

case x:

//statements

Break;

case y:

//statements

break;

default:

//statements

}

Switch case statement reducing the complexities of if else statement

Switch case structure should be used where the same code needs to be used for more than one condition therefore several if else statements are needed

For example we want to print the day of the week for a given number entered by the user

import java.util.*;

public class Main
{
public static void main(String[] args)
{
int day;
Scanner sc = new Scanner (System.in);
System.out.println("Enter the number:");
day = sc.nextInt();
switch (day)
{
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("Please enter theInvalid input");
break;
}
}
}

Screenshot

Output

If the same program written using if else statement 7 comparisons are needed that will create complexity in the code

Therefore switch case is the perfect choice

The drawback of case structure is

It will operate only on integer values

It cannot be used with float or string values

It can be used only with fixed value

Example

For example consider the program to find the grade of subjects when the user entered

The program will be using the logic

average>=80 then print Grade A

average<80 and average>=60 print Grade B

average<60 and average>=40 print Grade C

Else

Print Grade F

These kind of problems we can’t use switch the reason is average is using float value and in some ranges there are grades determined

Therefore if else will be appropriate for this situation

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