Ruby编程之函数计算

taxrate = 0.175
print "Enter price (ex tax): "
s = gets
subtotal = s.to_f
if (subtotal < 0.0) then
  subtotal = 0.0
end
tax = subtotal * taxrate
puts "Tax on $#{subtotal} is $#{tax}, so grand total is $#{subtotal+tax}"

Enter price (ex tax):123
 Tax on $123.0 is $21.525, so grand total is $144.525

class Dog
  def set_name(aName)
    @myname = aName
  end
  def get_name()
    return @myname
  end
end
mydog = Dog.new
mydog.set_name( 'Fido' )
puts(mydog.get_name)

Fido

puts "Hello, Ruby!";
print( 'Enter your name: ' )
name = gets()
puts( "Hello #{name}" )

Hello, Ruby!
Enter your name:Joshhua chan
 Hello Joshhua chan

taxrate = 0.175
print "Enter price (ex tax): "
s = gets
subtotal = s.to_f
tax = subtotal * taxrate
puts "Tax on $#{subtotal} is $#{tax}, so grand total is $#{subtotal+tax}"

Enter price (ex tax):1235
 Tax on $1235.0 is $216.125, so grand total is $1451.125

开发环境:Rubymine

The book of Ruby----A hands-on guide for the Adventurous---[美]Huw Collingbourne---no starch press