excep.cpp

#include <iostream>
#include <stdexcept>
using namespace std;

int divide(int A, int B);

int main()
{
    int A, B;
    cout << "Welcome do the marvelous divider!\n" << endl << endl;
    cout << "Enter a number A: " << endl;
    cin >> A;
    cout << "Now enter a number B: " << endl;
    cin >> B;
    cout << "The result is " << divide(A, B) << endl;
    return 0;
}

int divide(int A, int B)
{
    if (B == 0) throw std::invalid_argument("Denominator can't be 0!");
    return A/B;
}

max.rb

ar = [10, 39, 41, 20, 30, 40]

def max(array)
  res = 0
  array.each do |number|
    if (number > res)
      res = number
    end
  end

  return res
end

puts max(ar)