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

Pointer to an array, Write a method (belonging to the TermStructure class) ...

Write a method (belonging to the TermStructure class) that takes a pointer to an array of bonds and an integer, representing the number of bonds in the array as arguments, and esti

multithreaded server, Implement a multithreaded server that can be used as...

Implement a multithreaded server that can be used as a proxy server to access some designated file (say it reflects the proxy copy of two file1.txt, file2.txt). Now use a client to

Develop a c program for linux, develop a C program for Linux called pipes.c...

develop a C program for Linux called pipes.c that does the following: In the main() function, it creates a pipe using the pipe() function, then creates two child processes with

Compass bearing, write a c program that converts compass bearings into dire...

write a c program that converts compass bearings into direction

Algorithm, What is an algorithm and write an algorithm to calculate the sim...

What is an algorithm and write an algorithm to calculate the simple interest

Flowcharting., flowcharting of 3 quizes display the average

flowcharting of 3 quizes display the average

Define the processing of a structure, Define the Processing of a Structure?...

Define the Processing of a Structure? The members of structure are typically processed individually as separate entities. So we must be able to access the individual structure

How private instance of a class can be assigned values, Question 1: (a)...

Question 1: (a) Explain clearly the following concepts using suitable examples of your own:- (i) concrete class v/s abstract class (ii) constructor v/s over

Lowest cost entry, code for solving optimal solution for matrix

code for solving optimal solution for matrix

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