Armstrong Number & palindrome numbers with examples .

A positive integer is called an Armstrong number if the sum of cubes of individual digit is equal to that number itself. For example:

153 = 1*1*1 + 5*5*5 + 3*3*3  // 153 is an Armstrong number.
12 is not equal to 1*1*1+2*2*2  // 12 is not an Armstrong number.

#include <stdio.h>
int main()
{
  int n, n1, rem, num=0;
  printf("Enter a positive  integer: ");
  scanf("%d", &n);
  n1=n;
  while(n1!=0)
  {
      rem=n1%10;
      num+=rem*rem*rem;
      n1/=10;
  }
  if(num==n)
    printf("%d is an Armstrong number.",n);
  else
    printf("%d is not an Armstrong number.",n);
}
Output:Enter a positive integer: 371
371 is an Armstrong number
palindrome program in c language, c code to check if a string is a palindrome or not and for palindrome number.
#include <stdio.h>
#include <string.h>
 
int main()
{
   char a[100], b[100];
 
   printf("Enter the string to check if it is a palindrome\n");
   gets(a);
 
   strcpy(b,a);
   strrev(b);
 
   if (strcmp(a,b) == 0)
      printf("Entered string is a palindrome.\n");
   else
      printf("Entered string is not a palindrome.\n");
 
   return 0;
Output:
Enter the string to check if it is a palindrome
wow
Entered string is not a palindrome