How to find sum of first and last digit

CODE

How to find sum of first and last digit

If a six digit number is input through the keyboard, write a program to obtain the sum of the first and last digit of this number

int main()

{

    int num,sum,r1,r2;

    printf("\n enter the 6 digit number:");

    scanf("\n %i",&num);

    r1=num%10;

    r2=num/100000;

    sum=r1+r2;

    printf("\n sum of first and last digit of %d is %d",num,sum);

}

Output:

enter the 6 digit number:

123456

 sum of first and last digit of 123456 is 7