Subroutines make programs shorter as well as easier to read and understand, because they break program code into smaller sections. You can test procedures or functions separately, rather than having to test the whole program. This makes programs easier to debug.
How does a subroutine useful?
Subroutines are particularly useful for code that may be used repeatedly or whenever you wish to make your code more modular. Writing a subroutine is like creating your own method; a subroutine can take arguments and return a value, just like a method.
What are the main reasons for using subprograms?
There are several advantages to using subprograms:
- They help keep the code simple, and, thus, more readable;
- They allow the programmer to use the same code as many times as needed throughout the program;
- They allow the programmer to define needed functions; and,
- They can be used in other programs.
