Question

check if the sum of 1st and last digit of the number is equal to the sum of all remaining digits.

Answer 1

last digit.

Suppose if n = 1234

then last Digit = n % 10 => 4

To finding first digit of a number is little expensive than last digit. To find first digit of a number we divide the given number by 10 until number is greater than 10. At the end we are left with the first digit.