switch Statement in C-language

switch Statement:                   

switch statement is also a multi-way decision that allows for placing different block statements and execution depends on the result of the expression value.  The general format of switch statement is:

Syntax:           switch(Expression)

                        {

                                    case value1:   

                                                Block-1 code to be executed if expression equals to value1;

                                                break;

                                    case value2:   

                                                Block-2 code to be executed if expression equals to value2;

                                                break;

                                                .

                                                .

                                                .

                                    case valuen:   

                                                Block-n code to be executed if expression equals to valuen;

                                                break;

                                    default:          

                                    code/s to be executed if expression doesn't match to any cases;

                        }    next statements after switch statements

Ø  First Expression is evaluated and it produces an integer value.

Ø  Now, the expression value will be compared with case values value1, value2, ---, valuen by the compiler.  If any case value coincide with the expression value then that particular block statements are executed until break statement is encountered.

Ø  break is a branch control statement used to transfer the control out of the loop.

Ø  If the expression value doesn’t match with any case value then default block statements will be executed.  Default block is optional block.

Ø  Case values value1, value2, …. are either integer constants (or) character constants.

Ø  Case labels must be unique.  No two case labels should have the same name.

Ø  Generally switch statements are used for creating menu programs.

#include<stdio.h>

#include<conio.h>

main()

{

            int n;

            clrscr();

            printf("\n Enter a number (1 to 7):");

            scanf("%d",&n);

            switch(n)

            {

            case 1: printf(" Monday");

                        break;

            case 2: printf(" Tuesday");

                        break;

            case 3: printf(" Wednesday");

                        break;

            case 4: printf(" Thursday");

                        break;

            case 5: printf(" Friday");

                        break;

            case 6: printf(" Saturday");

                        break;

            case 7: printf(" Sunday");

                        break;

            }

getch();

}