Advantages
The advantages of breaking a program into subroutines include:
- decomposing a complex programming task into simpler steps: this is one of the two main tools of structured programming, along with data structures
- reducing duplicate code within a program
- enabling reuse of code across multiple programs
- dividing a large programming task among various programmers, or various stages of a project
- hiding implementation details from users of the subroutine
- improving traceability, i.e. most languages offer ways to obtain the call trace which includes the names of the involved subroutines and perhaps even more information such as file names and line numbers; by not decomposing the code into subroutines, debugging would be impaired severely
Read more about this topic: Subroutine
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