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 is function overloading, Question 1 What is function overloading? Wri...

Question 1 What is function overloading? Write a c++ program to implement a function overloaded Question 2 Explain about the constructors and Destructors with suitable exampl

Define the assignment operators in c language, Define the Assignment Operat...

Define the Assignment Operators in c language? The assignment operators can be used to assign a value to the variable and is represented by equal to (=) sign. The Assignment ex

Program, write a program that adds all numbers from 1 to 200

write a program that adds all numbers from 1 to 200

Write a haskell program, Write a Haskell program that calculates a balanced...

Write a Haskell program that calculates a balanced partition of N items where each item has a value between 0 and K such that the difference between the sum of the values of first

What is a hash function, What is a hash function? Hash function: This ...

What is a hash function? Hash function: This is the method from the set 'K' of keys into the set 'L' of memory addresses.   H: K → L These are used to verify the address

Can i explicitly call a destructor if i''ve allocated my , Can I explicitly...

Can I explicitly call a destructor if I've allocated my object with new?

Train Station Schedule, Train Station C++ Program A C++ program that provi...

Train Station C++ Program A C++ program that provides a simple text based interface that will allow a user to create, edit, search, or delete a train schedule. The program will m

Padovan string, example of padovan string program

example of padovan string program

Decoding smugglers message, Smugglers are becoming very smart day by day. N...

Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, they are send

Need an indicator, Need an indicator Project Description: Need an ind...

Need an indicator Project Description: Need an indicator which indicates target and trailing sl after entering trades. Skills required are C Programming, C++ Programming,

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