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

E-r diagrams, for ticket reservation in trains for payroll processing for i...

for ticket reservation in trains for payroll processing for insurance database

Control hazard and delayed branching, Described Instruction or control haza...

Described Instruction or control hazard? Ans: The pipeline can be stalled due to delay in the availability of an instruction. For instance, this may be a result of a miss in t

Define pvm library routines, Q. Define PVM library routines? In this se...

Q. Define PVM library routines? In this segment we will give a short description of the routines in PVM 3 user library. Each PVM program must comprise the PVM header file 'pvm3

Determine the complete or gate and and gate decoder, Q. Determine the comp...

Q. Determine the complete OR gate and AND gate decoder count for an IC memory with 4096 words of 1 bit each, using the Linear select memory organization and Two dimensional Memory

Explain in detail about touch screens, Explain in detail about Touch screen...

Explain in detail about Touch screens For people who can't use a keyboard allowing input; also helps people with learning difficulties since icons are easier to understand

Draw and illustrate the block diagram of DMA controller, Draw and illustrat...

Draw and illustrate the block diagram of DMA controller. Also discuss the various modes in which DMAC works. Direct memory access (DMA) is a process in that an external device

What is decision support system and describe its components, Q. What is a D...

Q. What is a DSS and Describe its components? A decision support system (DSS) is a highly flexible and interactive IT system that is designed to support decision making when t

Contain your variable names and definitions, Give your analysis for the fol...

Give your analysis for the following problem statement: You require to write a program that calculates the area and perimeter of a rectangle whose dimensions (Length &width) are gi

Determine about the verilog task, Determine about the Verilog Task - Ta...

Determine about the Verilog Task - Tasks are capable of enabling a function as well as enabling other versions of a Task. - Tasks also run with a zero simulation however the

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