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

Asynchronous and Synchronous types of serial communication, Differentiate b...

Differentiate between asynchronous and synchronous types of serial communication. Serial data communication uses two fundamental types, asynchronous andsynchronous. With synchr

# real life business subsystem, Is production, marketing, personal, materia...

Is production, marketing, personal, material, finance are the real life business subsystems? if yes, then how?

Explain latex in matlab, Matlab already handles naturally easy LaTeX encodi...

Matlab already handles naturally easy LaTeX encodings that permit introducing Greek lettters or modifying the font size and appearance in plots.

Determine signed binary number, -8 is equal to which signed binary number ?...

-8 is equal to which signed binary number ? Ans. 10001000 is the signed binary number that equal to - 8.   To show negative numbers in the binary system, Digit 1 is utilized fo

Explain functions of direct memory access, Q. Explain functions of direct m...

Q. Explain functions of direct memory access? Though CPU intervention in DMA is minimised however it should use path between interfaces that is system bus. So DMA involves an e

Illustrate working of t flip-flop, Q. Illustrate working of T Flip-Flop? ...

Q. Illustrate working of T Flip-Flop? T (Toggle) flip-flop is attained from JK flip-flop by combining inputs J and K together. The implementation of T flip-flop is displayed in

Approach to reasoning - first-order logic, Approach to reasoning - first-or...

Approach to reasoning - first-order logic: The formal approach to reasoning has bigger return and disadvantages. In generally we notice, if a computer program has proved somet

What is collation, What is Collation Collation refers to a set of rules...

What is Collation Collation refers to a set of rules that verify how data is sorted and compared. Character data is sorted using rules that explain  the correct character se

What is system prompt, Q. What is System Prompt? On loading (or Switchi...

Q. What is System Prompt? On loading (or Switching to) DOS, the screen displays C :\>, C>, A :\> or a similar message. The message displayed by DOS is called DOS Prompt or Sys

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