Class: Calculator

Inherits:

Object

• Object
• Calculator

Defined in:

lib/it_tools/calc.rb

Instance Method Summary

• #add ⇒ Object
• #enter(value) ⇒ Object
• #initialize ⇒ Calculator constructor

  A new instance of Calculator.

• #screen ⇒ Object

Constructor Details

#initialize ⇒ Calculator

Returns a new instance of Calculator.

# File 'lib/it_tools/calc.rb', line 2

def initialize
  @stack = []
end

Instance Method Details

#add ⇒ Object

# File 'lib/it_tools/calc.rb', line 11

def add
  @stack.push( @stack.pop + @stack.pop )
end

#enter(value) ⇒ Object

# File 'lib/it_tools/calc.rb', line 5

def enter( value ) 
  @stack.push value
end

#screen ⇒ Object

# File 'lib/it_tools/calc.rb', line 8

def screen
  @stack[0]
end