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

Physics, derive an expression for vandar wall equation of state?

derive an expression for vandar wall equation of state?

C++, What are virtual Functions

What are virtual Functions

What are threaded binary trees, What are threaded binary trees? A Threa...

What are threaded binary trees? A Threaded Binary Tree is a binary tree in which each node that does not have a right child has a THREAD (in real sense, a link) to its INORDER

Unlike ipv4 & ipv6 which field in base header not include, Unlike Ipv4, Ipv...

Unlike Ipv4, Ipv6 does not include which field in the base header? Unlike Ipv4, Ipv6 does not contain the Field for Fragmentation information into the base header.

What is the protocol used by sap gateway process, What is the protocol used...

What is the protocol used by SAP Gateway process? The SAP Gateway method communicates with the clients based on the TCP/IP Protocol.

How can we use / display table in a screen, How can we use / display table ...

How can we use / display table in a screen? ABAP/4 offers two mechanisms for showing and using table data in a screen.  These mechanisms are TABLE CONTROLS and STEP LOOPS.

Modelsim, design a basic computer

design a basic computer

Determine the current allocation state and granted process, An operating sy...

An operating system contains 3 resource classes. The number of resource units in these classes is 7, 7 and 10. The current resource allocation state is shown below:

Implication connective - modus ponens rule, Implication connective - Modus ...

Implication connective - Modus ponens rule: We notice that this is a trivial example, so it highlights how we use truth tables: as the first line is the only one when both abo

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