In this easy C language tutorial, we will learn everything about switch case statement in C programming, how to use and where to use a switch case.
Some times, a variable can have more than one values, and each value needs to execute different statements. For example, month is a variable, and the month has 12 different values, you need to execute different statement for each month. So, we can say switch statement is used solve multiple option types problem.

Syntax:
switch(expression)
{
	case value_1:
		//statements
		break;
	case value_2:
		//statements
		break;
	case value_3:
		//statements
		break;
	default:
		//statements
}

Example 1: switch case example in c, to print week day.

#include<stdio.h>
int main()
{
int day;
	printf("\nEnter Weeknum");
	scanf("%d", &day);
	switch(day)
	{
	case 1:
		printf("\nSunday");
		break;
	case 2:
		printf("\nMonday");
		break;
	case 3:
		printf("\nTuesday");
		break;
	case 4:
		printf("\nWednesday");
		break;
	case 5:
		printf("\nThursday");
		break;
	case 6:
		printf("\nFriday");
		break;
	case 7:
		printf("\nSaturday");
		break;
	default:
		printf("\nWrong Choice");
	}
return 0;
}

Sample Output:
Enter Weeknum : 3
Tuesday

Rules for Switch Case Statement in C

• the switch statement allows a variable to be tested, with the list of values, called the case.
• the switch statement can have any number of case.
• All case must end with a colon ( : ).
• switch, only accept int or char variable as a parameter.
• float and text values are not allowed.
• If, no case value is matched than default is executed.
• the default is optional, you can skip in your program.
• the break is to end processing and exit from the switch.

Example 2: C program, to accept an alphabet, and check it is vowel or consonant.

#include<stdio.h>
int main()
{
char alph;
	printf("\nEnter an Alphabet");
	scanf("%c", &alph);
	switch(alph)
	{
	case 'a':
	case 'A':
	case 'e':
	case 'E':
	case 'i':
	case 'I':
	case 'o':
	case 'O':
	case 'u':
	case 'U':
		printf("\nVowel");
		break;
	default:
		printf("\nConsonant");
	}
return 0;
}

Sample Output:
Enter an Alphabet : A
Vowel

---