Overview of Switch Statement

The control statement that allows us to make a decision from the number of choices is called a switch, or more correctly a switchcase-default, since these three keywords go together to make up the control statement.

switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each switch case.

Syntax of Switch Statement:

switch(integer expression) 
{
   case constant 1 : 
        do this ; 
   case constant 2 : 
        do this ; 
   case constant 3 : 
        do this ; 
   default : 
        do this ;
}

 Flow Diagram

Flow Diagram of switch statement
Fig- Flow Diagram of Switch Statement

 

Example:-


#include <stdio.h>
int main()
{
    int i = 3;
    switch( i )
    {
    case 1:
    printf(" OK ");
    case 2:
    printf(" Hello ");
    case 3:
    printf(" Hi ");
    default:
    printf(" Bye ");
}

Output:

 Hi 

Break Statement:

The switch statement executes the case where a match is found and all the subsequent cases and the default as well. To solve above problem by usinf Break keyword.

Syntax of Break Statement:

switch(integer expression) 
{
   case constant 1 : 
        do this ;
        break ;  
   case constant 2 : 
        do this ; 
        break ; 
   case constant 3 : 
        do this ; 
        ​​​​​​​break ; 
   default : 
        do this ;
}