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

Explain about multidimensional features present in olap, Multidimensional s...

Multidimensional support is very necessary if we are to contain multiple hierarchies in our data analysis. Multidimensional feature permits a user to examine business and organizat

Use string manipulating functions , Write a script that will first initiali...

Write a script that will first initialize a string variable that will kept x and y coordinates of a point in the form 'x 3.1 y 6.4'.  Then, use string manipulating functions to ext

Minimize the logic function using NAND gate, Minimize the logic function F(...

Minimize the logic function F(A, B, C, D) = ∑ m(1,3,5,8,9,11,15) + d(2,13) using NAND gate with help of K-map. Ans. Realization of given expression by using NAND gates:  In

Main drawbacks of cd-roms, Q. Main drawbacks of CD-ROMs? The main drawb...

Q. Main drawbacks of CD-ROMs? The main drawbacks of CD-ROMs are: It is read only thus can't be updated Access time is longer than that of magnetic disks. Very

Give the sequence of procedure calls for server and client, Give the sequen...

Give the sequence of procedure calls for both server and client for connect ion-oriented application.   In connection oriented communication the order of Procedure call

And-elimination rule, And-Elimination rule: In generally English says ...

And-Elimination rule: In generally English says that "if you know that lots of things are all true, so you know like any one of them is also true". Because you can specify a c

Computer networking, what are the steps to implement bus topology?

what are the steps to implement bus topology?

Select-options and parameters statement , The fields specified by select-op...

The fields specified by select-options and parameters statement cannot be grouped together in the selection screen. No, the fields specified by select-options and parameters s

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