Quick Answer: What Is Subroutine With Example?

How stack is used in subroutine call?


Since the call stack is organized as a stack, the caller pushes the return address onto the stack, and the called subroutine, when it finishes, pulls or pops the return address off the call stack and transfers control to that address..

How do you write a subroutine?

Keep these in mind when writing your subroutines:You do not need to declare the subroutine name in the main program as you do with a function name.They begin with a line that includes the word SUBROUTINE, the name of the subroutine, and the arguments for the subroutine.

What is the difference between function and procedure?

A function is used to calculate result using given inputs. A procedure is used to perform certain task in order. A function can be called by a procedure. A procedure cannot be called by a function.

What happens when a subroutine is called?

When a subroutine is called, the address of the next sequential instruction just before the BSR or JSR is saved on the stack. At the end of the subroutine, this returned address is pulled from the stack and loaded to the PC. … Data needed by a subroutine is pushed on the stack immediately before the subroutine call.

What are the two types of subroutines?

There are two types of subroutine:procedures.functions.

What is subroutine call and return?

The CALL instruction interrupts the flow of a program by passing control to an internal or external subroutine. An internal subroutine is part of the calling program. The RETURN instruction returns control from a subroutine back to the calling program and optionally returns a value. …

What is subroutine explain with example?

In computer programming, a subroutine is a sequence of program instructions that performs a specific task, packaged as a unit. This unit can then be used in programs wherever that particular task should be performed.

What are subroutine calls?

In computer: Central processing unit. A related instruction is the subroutine call, which transfers execution to a subprogram and then, after the subprogram finishes, returns to the main program where it left off.

What is subroutine in C programming?

Subroutines/Functions in C/C++ Subroutine/Function is a programming construct that allows a programmer to associate a given set of instructions with a specific name. A subroutine/function consist of a (unique) name and a (subroutine/function) body.

Is a function a type of subroutine?

Every subroutine performs some specific task. For some subroutines, that task is to compute or retrieve some data value. Subroutines of this type are called functions. We say that a function returns a value.

What is a subroutine in Python?

They are known in most programming languages, sometimes also called subroutines or procedures. Functions are used to utilize code in more than one place in a program. The only way without functions to reuse code consists in copying the code. A function in Python is defined by a def statement.

What is the difference between interrupt and subroutine call?

The big difference is that you know where the subroutine runs (because you call it). … Simply, a subroutine is code you write and call as required, an interrupt is system bound and cannot be called by the user but occurs when something happens (sources are hardware, software and CPU) that requires immediate attention.

Why return statement is used in a subroutine call?

In computer programming, a return statement causes execution to leave the current subroutine and resume at the point in the code immediately after the instruction which called the subroutine, known as its return address.

What is the difference between subroutine and function?

Functions and subroutines operate similarly but have one key difference. A function is used when a value is returned to the calling routine, while a subroutine is used when a desired task is needed, but no value is returned.

What is C method?

A method is a code block that contains a series of statements. A program causes the statements to be executed by calling the method and specifying any required method arguments. In C#, every executed instruction is performed in the context of a method.