# Program to implement switch case
#include<stdio.h>
#include<process.h>
#include<math.h>
void main()
{
	float sub,sum,product,div,power,n1,n2;
	int opt;
	printf("Press the required option 1.Add 2.Sub 3.Multi 4.Divide 5.Power 6.Exit");
	scanf("%d",&opt);
	printf("Enter first integer:");
	scanf("%f",&n1);
	printf("Enter second integer:");
	scanf("%f",&n2);
	switch(opt){
	case 1: sum=n1+n2;
	        printf("Sum of given numbers is:%.2f",sum);
	        break;
	case 2: sub=n1-n2;
	        printf("sub of given number is:%.2f",sub);
	        break;
	case 3: product=n1*n2;
	        printf("Product of given number is:%.2f",product);
	        break;
	case 4: div=n1/n2;
	        printf("Quotient is:%.2f",div);
	        break;
	case 5: power=pow(n1,n2);
	      	printf("first number to the power second number is:%.2f",power);
			break;
	case 6: exit(0);
	       }
}

//Checking the input letter is uppercase/lowercase/digit using switch case
#include 
int main()
{
char i;
printf("Enter a character: \n");
scanf("%c",&i);
switch(i)
{
case 'A'...'Z':
			printf("Upper case character\n");
			break;
case 'a'...'z':
			printf("Lower case character\n");
			break;
case '0'...'9':
			printf("Digit \n" );
			break;
default:
			printf("Special character\n");
}
return (0);
}

Output

Run the program to see the OUTPUT