2.1.10

Subroutines

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Subroutines

A subroutine is a named block of code within your program.

Illustrative background for Advantages of subroutinesIllustrative background for Advantages of subroutines ?? "content

Advantages of subroutines

  • Easier to read:
    • There are fewer long blocks of code to understand.
  • More efficient:
    • Blocks of code can be written once and reused many times.
  • More reliable:
    • Each subroutine can be individually tested to make sure it works.
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Parameters and arguments

  • Parameters are special variables used to pass values into a subroutine.
  • Arguments are the actual values that are passed in.
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Types of subroutine

  • A function is a subroutine which returns a value.
  • A procedure is a subroutine which does not return a value.

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