9.3.4 Switch Statement

Switch Statement in C.

• The switch statement is similar to if statement but case check is done instead of checking the condition. 
• When you come to a particular case, you write the statements that you want to execute inside the case. 
• Case is matched to an integer variable. 
• The same case goes to the execute case which matches the integer variable

Syntax :-

int caseNumber = n;

switch(caseNumber)

{

case 1:

/* Statements to be executed if caseNumber is 1 */

break;

case 2:

/* Statements to be executed if caseNumber is 2 */

break;

default:

/* Statements to be executed if caseNumber is not 1 & 2 */

break;

}

• When you set the caseNumber variable with an integer value and pass it in the switch statement, the same number that matches this number will be executed.
• For example, if you have passed 2 in case number then the case of second number will execute and all statements before the break will be executed.
• If a case does not match then the default case is execute. 
• If after each case the break statement is used then all the cases will be executed.
• You can also define the case with alphabets.

EXAMPLE :-

// Switch Statement in C.

#include <stdio.h>

void main()

{

int caseNumber;

printf("Enter a number : ");

scanf("%d",&caseNumber);

/* Passing the case number to switch to execute desired case */

switch(caseNumber)

{

case 1:

printf("\n First Switch Case executed..");

break;

case 2:

printf("\n Second Switch Case executed..");

break;

case 3:

printf("\n Third Switch Case executed..");

break;

case 4:

printf("\n Fourth Switch Case executed..");

break;

default:

printf("\n You can only enter 1,2,3 and 4");

break;

     }

}

OUTPUT

Third Switch Case executed..