#
# Extracts the last N digits from a given number.
#
# Approach:
# - To get the last N digits, compute: number % (10 ** digits)
# - This avoids string manipulation and uses efficient arithmetic.
#
# Parameters:
# number : the original integer
# digits : how many digits to extract from the end
#
# Returns:
# The last N digits as an integer.
#
def get_last_n_digits(number, digits)
# Compute 10^digits using Ruby's exponent operator (**)
divisor = 10 ** digits
# Modulo returns the remainder, which is exactly the last N digits
number % divisor
end
# Example values
number = 987_654_321
digits = 4
# Extract the last N digits
result = get_last_n_digits(number, digits)
# Display the result
puts "Original number: #{number}"
puts "Digits requested: #{digits}"
puts "Last #{digits} digits: #{result}"
=begin
run:
Original number: 987654321
Digits requested: 4
Last 4 digits: 4321
=end
