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

Prepurchase and purchase consummation of consumer mercantile, Differentiate...

Differentiate between Prepurchase and Purchase Consummation of consumer mercantile model. The prepurchase interaction for consumers comprises three activities: Product/ser

Computer aided manufacture, Before we take a detailed look about software l...

Before we take a detailed look about software languages, let us consider the role of computers in engineering. Computers are commonly used in the areas of 'Computer Aided Design /

What is roll area, What is roll area? A roll area having the program's...

What is roll area? A roll area having the program's runtime context.  In addition to the runtime stack and other structures, all local variables and any data known to the prog

Web service as opposed to a non-serviced, Can you give an example of when i...

Can you give an example of when it would be appropriate to use a web service as opposed to a non-serviced .NET component? A web service has the following characteristics:  1

What is reduction, What is reduction?  A reduction is a way of changing...

What is reduction?  A reduction is a way of changing one problem into another in such a way that a solution to the second problem can be used to explain the first problem.

Sequential execution of instructions in risc, Q. Sequential Execution of In...

Q. Sequential Execution of Instructions in RISC? Let's describe pipelining in RISC with an illustration program execution sample. Take the given program (R denotes register).

Xor gate, The XOR gate. The exclusive OR or XOR gate is similar to a tw...

The XOR gate. The exclusive OR or XOR gate is similar to a two input OR gate. The output of an XOR gate is logic 1 only when one input or the other input is high and is 0 when

What are the benefits of using e-commerce, What are the benefits of using e...

What are the benefits of using e-commerce? Basic Benefits of E-Commerce The main benefits are enhancing sales and reducing costs. The other advantages are as follows: 1.

Access to external identifiers, Access to External Identifiers: An external...

Access to External Identifiers: An external identifier is one which is referred in one module though defined in another. You can declare an identifier to be external by including i

Replacement policy - cache memories , Replacement policy: On a particul...

Replacement policy: On a particular cache miss we require to evict a line to build room for the new line "In an A-way set associative cache, we have A option of which block

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