Subroutine

Subroutine, also known as a function, procedure, or routine, is a section of code that performs a specific task in computer programming. A subroutine is often used to break down a larger program into smaller and more manageable pieces of code. Subroutines can accept input values, process data, and return an output or a result.

Subroutines are important to make sure that a program works properly, by providing structure, reducing repetition, and improving efficiency. Other benefits of using subroutines include making debugging easier and reusing code. To call a subroutine, a program uses a special instruction, often known as a “call” or “jump”.

There are various types of subroutines, including assembly language, recursive, thread-safe, serial, looping, and interrupt routines. Assembly language subroutines are typically used in low-level programming languages like C++ and Java. Recursive subroutines are used to repeat a code multiple times until a certain condition is met. On the other hand, thread-safe subroutines are used to ensure that a program can handle multiple requests from users without creating any conflicts.

In addition, serial subroutines are used to execute instructions in a sequence, looping subroutines repeat a certain code over and over until it finds the desired output, and interrupt routines handle a specific condition or signal, typically from an external device such as a keyboard or mouse.

Overall, subroutines are used to break up and manage longer, complex computer programs. By using subroutines, programmers can easily identify, debug, and reuse code. As such, subroutines are an essential part of any computer program.