Explain call by reference, C/C++ Programming

Assignment Help:

Call by Reference

Passing variables(parameters) to a function in C can be done in two ways - pass by value, also called as call by value and pass by address or also known as call by address. C++ though , gives one more way to call a function - call by reference. In call by value , a copy of the actual contents of the variables is passed to the function. In this case, alters made to the formal variable , as they are called, are not reflected back in the calling function. Passing an address permits changes to be made directly to the memory, which are occupied by the actual variable.

Though, a call by address requires the formal variable to be considered as pointer and therefore the indirection operator has to be used with them. A reference on the other hand, is another name, for a previously explained variable. In other words, after a reference is explained for a particular variable, using its original name as well as the reference can refer to the variable. Hence, a reference is nothing but an alias.

 Thus not passing a copy (call by value) saves time and is efficient. It does not have to make a temporary variable /. And not passing the address(call by address), eliminates the use of pointers in the called functions. But, at the same time, the changes made to a formal variable , using its reference or alias can be reflected back in the calling function.

 


Related Discussions:- Explain call by reference

What does extern "c" int func(int *, A: This will turn o_ "name mangling" f...

A: This will turn o_ "name mangling" for func so that one can connect to code compiled by a C compiler.

Board colouring, in this problem you are given a board in which some of the...

in this problem you are given a board in which some of the elements are placed..each element represent ancolor.fill the other elements in the board such that none of the adjacent e

I need voting bot, Project Description: Seeking a Voting Bot Script / Pr...

Project Description: Seeking a Voting Bot Script / Program Skills required are ASP, Javascript, C Programming, PHP, Software Architecture

Explain the type conversion in expressions in c language, Explain The Type ...

Explain The Type Conversion in Expressions in c language? When variables and constants of different types are used in an expression they are all converted to same type. The com

Illustration of plot function, Illustration of Plot function: To be mo...

Illustration of Plot function: To be more common, the script could prompt the user for the time and temperature, instead of just assigning the values. Then, the axis function

Create a c project, The project will include Arena models (only .doe files)...

The project will include Arena models (only .doe files) and MSWord document for the report. Thereport must contain the following sections: 1. Introduction: (a)    Statemen

201 it, overload assignment opertor to assign the data of one object to ant...

overload assignment opertor to assign the data of one object to anthor

Luminous Jewels - The Polishing Game, 1. Jewels can only be removed for pol...

1. Jewels can only be removed for polishing from either end of the necklace (i.e. head or tail) 2. Once a jewel type is removed from the necklace, all other instances of the same j

Pseudocode , Record separation problem Let us assume that a particular data...

Record separation problem Let us assume that a particular database program manages a simple mailing list which consists of one record for each person on the list, and a number of f

Mathematics, C Coding to find the area under the curve y = f(x) between x =...

C Coding to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can be found

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