class BankAccount attr :dollars, true def deposit(x) self.dollars+=x end def withdraw(x) self.dollars=[0, dollars-x].max end def initialize self.dollars=0 end end account=BankAccount.new account.dollars=200 p account.dollars # 200 account.deposit 50 p account.dollars # 250 account.withdraw 100 p account.dollars # 150 account.withdraw 200 p account.dollars # 0 class StockAccount < BankAccount attr :numShares, true attr :pricePerShare, true def dollars self.numShares self.pricePerShare end def dollars=(x) self.numShares=(Float x)/self.pricePerShare end def initialize self.numShares=10 self.pricePerShare=30 end end stock=StockAccount.new p stock.numShares # 10 p stock.pricePerShare # 30 p stock.dollars # 300 stock.dollars=150 p stock.numShares # 5.0 stock.dollars=600 p stock.dollars # 600.0 p stock.numShares # 20.0 stock.deposit 60 p stock.dollars # 660.0 p stock.numShares # 22.0
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