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 unordered lists, Q. What is Unordered Lists? First, we will bui...

Q. What is Unordered Lists? First, we will build an unordered list. Many times, these lists are also termed as bulleted lists. These lists are characterized by list items which

Sun and nis law, Q. What is Sun and Nis Law? The Sun and Ni's Law is a ...

Q. What is Sun and Nis Law? The Sun and Ni's Law is a simplification of Amdahl's Law and Gustafson's Law. The basic concept underlying Sun and Ni's Law is to find solution to a

By which each connected device is assigned a time slot, Using             ...

Using                    each connected device is assigned a time slot whether or not the device has anything to send. (A) WDM                                        (B)  FDM

How to save your file in dreamweaver, HOW TO SAVE YOUR FILE? Step 1: Cl...

HOW TO SAVE YOUR FILE? Step 1: Click on FILE Step 2: Click on SAVE Step 3: Choose the folder in which you want to save Step 4: Provide a name to the file (with .htm /

What is structural hazard, What is structural hazard? Structural hazard...

What is structural hazard? Structural hazard is the situation when two instructions needs the use of a given hardware resource at the similar time. The most common case in whic

What is an orthogonal base class in c++, If two base classes have no overla...

If two base classes have no overlapping methods or data they are said to be independent of, or orthogonal to each other. Orthogonal in the sense means that two classes function in

State and describe the iros subsystems, Question: (a) iRoom was constru...

Question: (a) iRoom was constructed based on the guiding principles listed below, discuss on each one of those principles with respect to why the specific principle was adopted

State the use parameters and parameter definition modules, State the Use pa...

State the Use parameters and parameter definition modules. Parameters aren't preprocessor definitions and they have scope (for example parameters are associated with specific

Write an awk program - unix , Write an AWK program which takes the followin...

Write an AWK program which takes the following input file and processes it. $cat data.txt John Do 111-1111 English 90 Maths 80 Alice Do 222-2222 English 90 Maths 90 Chemistry 93

Dma controllers - computer architecture, DMA controllers in computer system...

DMA controllers in computer system:   DMA Controller   Part of the I/O device interface   DMA Channels   Performs functions that in general would be performed by t

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