Switch Statements in C

Switch statements is used to create the multiple option. If there is multiple option in our program then we use switch statement.

Rules of switch statements

• Expression is mandatory in switch.
• Switch will take expression.
• We can't write switch expression as a constant.
• Switch expression type is int and char only.
• You can take character as label because it work on ASCII character.
• You can't take expression as a float.
• Every case should be in the switch body.
• You can write multiple statement in one case.
• Order of case are not mandatory.
• You can't take case label as a variable.
• Only constant value required in case.
• Duplicate case are not allowed.
• We can write case in any order.
• All case are optional in switch statement.
• You can't write directly any statement in switch. Case must be required.

Syntax of switch statements:

	
    switch(expression)
    {
    case 1: 
    statement 1;
    break;
    
    case 2:
    statement 2;
    break;
    
    case n:
    statement n;
    
    default:
    statement 3;
    }
	

Switch statement first take expression then go for cases then match the case. If case not matched then move to next case, again not match go up to n(case), then go for default.

Example of switch statement program:

	
    #include<stdio.h>
    #include<conio.h>

    void main()
    {
	int option;
	int n;
	clrscr();
	printf("Enter Your Choice Between 1 to 3.");
	scanf("%d",&n);
	switch(option)
	{
	case 1:
	printf("Today is Monday.");
	break;
	case 2:
	printf("Today is Sunday.");
	break;
	case 3:
	printf("Today is Friday.");
	break;

	default:
	printf("You selected incorrect option.");
	}
	getch();
    }