Subroutines

• What is a Subroutine

  A predefined block of code with a unique name, that can be called at any time by writing its name
• List the two types of sub-programs

  • Subroutine (no return value)
  • Function (has a return value)
• What are Parameters

  Input variables needed to create a subroutine
• What are Arguments

  Input values passed into already created subroutines
• List the advantages of using subroutines

  • Easier to understand the program
  • Test subroutines in isolation
  • Develop them independently of each other
  • Change one subroutine without affecting the others
  • Easily debugged for errors
  • Allows programmers to develop a whole program together