Factorial program in c using for loop

#include <stdio.h>

int main()
{
               int a, n;
               int fact = 1;

               printf("Enter a number to calculate it's factorial\n");
               scanf("%d", &n);

               for (a = 1; a <= n; a++)
                     fact = fact * a;
               printf("Factorial of %d = %d\n", n, fact);
               return 0;
}

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To check leap year in C

#include <stdio.h>

int main()
{
               int year;
               printf("Enter a year to check if it is a leap year\n");
               scanf("%d", &year);

                if ( year%400 == 0)
                      printf ("%d is a leap year.\n", year);
               else if ( year%100 == 0)
                      printf ("%d is not a leap year.\n", year);
               else if ( year%4 == 0 )
                      printf ("%d is a leap year.\n", year);
               else
                      printf ("%d is not a leap year.\n", year); 
                return 0;
}

 

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Palindrome number in c program

Palindrome number

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

int main()
{
   int n, reverse = 0;
   int temp;

   printf("Enter a number to check if it is a palindrome or not\n");
   scanf("%d",&n);

   temp = n;

   while( temp != 0 )
   {
      reverse = reverse * 10;
      reverse = reverse + temp%10;
      temp = temp/10;
   }
   if ( n == reverse )
      printf("%d is a palindrome number.\n", n);
   else
      printf("%d is not a palindrome number.\n", n);
   return 0;
}

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