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class Matematica
   def initialize(x,y)
      @x, @y
   end
end

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mat = Matematica.new(1,4)

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class Matematica
   def initialize(x,y)
      @x = x
      @y = y
   end

   def to_s
      "(#@x,#@y)"
   end
end

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class Matematica
   def initialize(x,y)
      @x = x
      @y = y
    end
end

m = Matematica.new(3,4)
puts m

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class Pessoa
   def hello
     puts 'Hello'
   end
end

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class Product < ActiveRecord::Base
   validates_presence_of :nome, :descricao
end

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class CreateProducts < ActiveRecord::Migration
   def self.up
      create_table :products do |t|
        t.string :nome
        t.text :descricao
        t.timestamps
      end
   end
  def self.down
   drop_table :products

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import java.io.Serializable;
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;

@Entity
public class Product implements Serializable {

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import static org.junit.Assert.*;

import org.junit.Before;
import org.junit.Test;

public class test_stack{
	
	private Stack ste;
	
	@Before

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public class Stack {
	
	private Element top;
	private Integer tam;
	private Element temp;
	
	public Stack(){
		this.top = null;
		this.tam = 0;