C Program to create a menu based program using switch case

C Program to create a menu based program using switch case

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void main()
{
int s,n1,rem,rev=0,num,n,f=1,i,sum=0;
clrscr();
printf("Choose the option\n");
printf("1. Cheque wheather number is palindrome\t2. Factorial value\n");
printf("3. Sum of n natural number\t\t4. Exit\n");
scanf("%d",&s);
switch(s)
{
case 1:
printf("Enter the number\n");
scanf("%d",&n1);
num=n1;
while (n1>0)
{
rem=n1%10;
n1=n1/10;
rev=rev*10+rem;
}
printf("reverse number is %d\n",rev);
if(num==rev)
printf("Number is palindrome");
else
printf("Number is not palindrome\n");
break;
case 2:
printf("Enter the number\n");
scanf("%d",&n);
for(i=n;i>0;i--)
f=f*i;
printf("factorial is %d",f);
break;
case 3:
printf("How many numbers do you want to enter\n");
scanf("%d",&n);
printf("Enter %d numbers\n",n);
for(i=0;i<n;i++)
{
scanf("%d",&n1);
sum=sum+n1;
}
printf("sum of %d numbers is %d",n,sum);
break;
case 4:
exit();
}
getch(0);
}