Normal Variables Vs Instance variable in Ruby, Whats the difference?

Question

Consider the following sample ruby class

class User
  def hello
    puts \"hello\"
  end
end

now, for initialization. there are two ways

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Answer 1

A normal variable has scope only within the current context; an instance variable has scope throughout one instance of a class. In your case they're confused because the context is main, which acts as an instance of Object.

Consider the following, which may make things clearer

class User
  def set_name
    @name = "Bob"
    surname = "Cratchett"
  end

  def hi
    puts "Hello, " + @name
  end

  def hello
    puts "Hello, Mr " + surname
  end
end

irb(main):022:0> u = User.new
=> #
irb(main):023:0> u.set_name
irb(main):024:0> u.hi
Hello, Bob
=> nil
irb(main):025:0> u.hello
NameError: undefined local variable or method `surname' for #