Switch statements with Syntax and Example in C

There are following types of conditional statements in C :

• if statement
• if - else statement
• nested if-else statement
• if -else if ladder
• switch statement

5. Switch statement -The switch statement allows us to execute the case according to or as per the needs of user's choice among many the alternatives .

How does the switch statement work?

• The expression is checked once and compared with the values of each case label.
• If the value of the expression is equal to any of the constant , the statements in that case are executed until the break is encountered.
• If the constant according to the users demand is not found, then the default statements are executed.
• If we do not use break, then all statements of the case after that case are executed.
• The default statement inside the switch statement is optional.

Syntax :

switch (expression)

{ 

  case constant1:

  //  C statements

  break;

  case constant2:

  //  C statements

  break;

  .

  . 

  default:

  // C default statements 

}

Flow Diagram of Switch statement

        

Example of Switch case in C

#include<iostream.h>

#include<conio.h>

int main()

{

   int operation="1";

   switch(operation)

   {

      case 1 :

      printf("You have selected operation 1.");  //diplayed as output

      break;

    

      case 2 :

      printf("You have selected operation 2."); //diplayed as output

      break;

    

      default : 

      printf("Invalid Choice");   //diplayed as output

    }

   getch();

}

OUTPUT:

You have selected operation 1.