write a program to obtain the sum of the first and last digit of this number

#include <stdio.h>

int main()
{
    int n, first_dig,last_dig,sum=0;


    printf("Enter any number: ");
    scanf("%d", &n);

    first_dig = n;


    while(first_dig >= 10)
    {
        first_dig = first_dig / 10;
        last_dig =n%10;
        sum=first_dig+last_dig;
    }



   printf("First & Last digit summation = %d",sum);

    return 0;
}