class Calculator
def add(a, b)
a + b
end
def subtract(a, b)
a - b
end
def multiply(a, b)
a * b
end
def divide(a, b)
raise ZeroDivisionError, "Division by zero" if b == 0
a / b
end
end
module MathUtils
def self.factorial(n)
raise ArgumentError, "Factorial is not defined for negative numbers" if n < 0
return 1 if n <= 1
n * factorial(n - 1)
end
def self.prime?(n)
return false if n < 2
(2..Math.sqrt(n)).none? { |i| n % i == 0 }
end
def self.fibonacci(n)
raise ArgumentError, "Fibonacci is not defined for negative numbers" if n < 0
return 0 if n == 0
return 1 if n == 1
fibonacci(n - 1) + fibonacci(n - 2)
end
def self.gcd(a, b)
b == 0 ? a : gcd(b, a % b)
end
def self.lcm(a, b)
(a * b) / gcd(a, b)
end
end
# Example usage
if __FILE__ == $0
calc = Calculator.new
puts "5 + 3 = #{calc.add(5, 3)}"
puts "10! = #{MathUtils.factorial(10)}"
puts "Fibonacci 8 = #{MathUtils.fibonacci(8)}"
puts "Is 17 prime? #{MathUtils.prime?(17)}"
puts "GCD(24, 16) = #{MathUtils.gcd(24, 16)}"
puts "LCM(12, 8) = #{MathUtils.lcm(12, 8)}"
end
