Find the sum of the first and last digits of a number with C.

#include <stdio.h>

int main()
{
  int num, first, last;

  /* First number */
  printf("Enter any number: ");
  scanf("%d", &num);

 first = num;
 while (first >= 10)
 {
   first = first / 10;
 }
 printf("First digit = %d \n", first);

 /* last number */
 last = num % 10;
 printf("First digit = %d", last);

  return 0;
}

Output:-

Enter any number : 645645
First digit = 6
First digit = 5