Problem Statement

Get two integers from the user, then create a two-dimensional array where the two dimensions have the sizes given by those numbers, and which can be accessed in the most natural way possible. Write some element of that array, and then output that element. Finally destroy the array if not done by the language itself.

Let's start with the solution:

require "random"

first = gets.not_nil!.to_i32
second = gets.not_nil!.to_i32

arr = Array(Array(Int32)).new(first, Array(Int32).new second, 0)

random = Random.new

first = random.rand 0..(first - 1)
second = random.rand 0..(second - 1)

arr[first][second] = random.next_int
puts arr[first][second]