Why pointer variable to a function as an argument, Computer Engineering

Assignment Help:

Why pointer variable sometimes desirable to pass a pointer to a function as an argument?

Frequently, a called function needs to make changes to objects declared in the calling function. For example, the function, scan(), needs to access objects in the calling function to store the data read and converted into an object defined there. Therefore, we supply scan() with the address of objects rather than their values.

Another common use of pointers is to write functions that ''return'' more than one value. As we have seen, every function in C returns a value as the value of the function; however, if a function's meaning includes the return of several pieces of information, this single return value is not sufficient. In these cases, we can have the function return multiple data values indirectly, using pointers.

 


Related Discussions:- Why pointer variable to a function as an argument

What is known as multiphase clocking, What is known as multiphase clocking?...

What is known as multiphase clocking? When edge-triggered flip flops are not used, two or more clock signals may be required to guarantee proper transfer of data. This is calle

Show network topology in digital system, Q. Show Network Topology in digita...

Q. Show Network Topology in digital system? This deals with the geometrical arrangement of nodes (endpoints consisting of physical devices such as terminals, printers, PCs, and

Explain conditions under which a deadlock situation arise, What are conditi...

What are conditions under which a deadlock situation may arise? A deadlock situation can arise if the following four conditions hold concurrently in a system:  a. Mutual exc

What is a switchboard, What is a switchboard A switchboard is only a f...

What is a switchboard A switchboard is only a form with command button that open other switchboard or perform tasks like opening forms and printing reports. Switchboard is a t

What is friend function in c++, As the name suggests, the function acts as ...

As the name suggests, the function acts as a friend to a class. As a friend of a class, it can access its private & protected members. A friend function is not a member of the clas

Explain basic function of keyboard, Q. Explain basic function of Keyboard? ...

Q. Explain basic function of Keyboard? Keyboard is the major input device for your computer. It is an accurate and fast device. The multiple character keys permit you to transm

Why we need the need of parallel computation, THE NEED OF PARALLEL COMPUTAT...

THE NEED OF PARALLEL COMPUTATION   With the growth of computer science, computational pace of the processors has also increased many a times. Though, there are definite constr

What is associative search, What is associative search? The cost of an ...

What is associative search? The cost of an associative cache is higher that the cost of a direct mapped cache due to the need to search all 128 bit tag patterns to verify wheth

What is sap luw or update transaction, What is SAP LUW or Update Transactio...

What is SAP LUW or Update Transaction? Update transaction (or "SAP LUW") This is a set of updates terminated by an ABAP/4 commit.  A SAP LUW may last much longer than a data

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd