If a 4-digit number is input though the keyboard. Write a program to obtain the sum of the first & last digit of this number.

Source Code :

#include<stdio.h>

void main()

{

      int a,sum=0,rem,div,ctr=1;

      clrscr();

      printf("\nEnter a 4-digit Number : ");

      scanf("%d",&a);

      rem=a;

      div=a;

      while(rem!=0)

      {

            rem=rem%10;

            div=div/10;

            if(ctr==1 || ctr==4)

            {

                  sum+=rem;

            }

            rem=div;

            ctr++;

      }

      printf("\nSum of the First and Last Digit : %d",sum);

      getch();

}

Output :

Enter a Number : 1234

Sum of the First and Last Digit : 5