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

Is it legal for a member function to say delete this?, Is it legal for a me...

Is it legal for a member function to say delete this? A: As long as you're cautious, it's OK for an object to delete this. Here's how I define "cautious": You have to be a

Object Oriented Programming , You are required to give C++ implementation o...

You are required to give C++ implementation of following classes: 1. PropertyCategories 2. Plot 3. Flat 4. House Following is the description of all data member and member funct

Sorted directory - c++ program, Sorted directory - C++ program: Write ...

Sorted directory - C++ program: Write a program in c to sorting a directory. int main( int argc, char *argv[] ) {     if( argc 3 )         {         cerr

C expressions - assume variables are double or float, Assume variables x, f...

Assume variables x, f, and d are of type int, float, and double, respectively.  Their values are arbitrary, except that neither f nor d equals +∞, -∞, or NaN .  For each of the fo

Program for number game, - Create a program that uses at least two function...

- Create a program that uses at least two functions that will be called from your main. This program is a number game program that asks for parts of your phone and after manipulati

Explain object-oriented programming, Explain Object-oriented programming ...

Explain Object-oriented programming Object-oriented programming (OOP) attempts to meet these requirements, providing methods for managing enormous complexity, achieving reuse o

Playback pattern sequences, This task involves creating a new class(es) tha...

This task involves creating a new class(es) that will allow the system to playback pattern sequences using the Neo  Freerunner  hardware. The first thing to note is that the vibrat

Explain difference between early binding and late binding, What is the diff...

What is the difference between early binding and late binding? What are advantages of early binding? a.) Late binding refers to function calls which aren't resolved until run t

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