Execution Before or After a Program
# BEGIN and END code to execute before and after a program runs. # Both BEGIN and END are followed by blocks enclosed by braces ({}) BEGIN { puts "Date and time: " + Time.now.to_s } def bmi( weight, height ) 703.0*( weight.to_f/(height.to_f**2)) end my_bmi = bmi( 196, 73 ) puts "Your BMI is: " + x = sprintf( "%0.2f", my_bmi ) END { puts "You've got some work ahead of you." }
1. | The code in a block labeled with the keyword BEGIN is run automatically when a Ruby program is loaded | ||
2. | The code in a block labeled END is automatically run when the program finishes. |