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

Lexicographically preceding permutation, Given an integer n and a permutati...

Given an integer n and a permutation of numbers 1, 2 ... , n-1, n write a program to print the permutation that lexicographically precedes the given input permutation. If the given

Area under curve, write a program to find the area under curve y=f(x) betwe...

write a program to find the area under curve y=f(x) between x=a and x=b,integrate y=f(x) between the limits a and b

Static data members and static member function, Static Data Members: A ...

Static Data Members: A data member inside the class can construct as static data member.   There are few guidelines to be followed when declaring static data member.

College, #question.College life is tough. Eating pizza for every meal is h...

#question.College life is tough. Eating pizza for every meal is hitting you hard. You are looking at working out to stay healthy. You found a web site that tells you how many ca

Explain structured programming, Explain structured programming The prin...

Explain structured programming The principal idea behind structured programming was as easy as the idea of "divide and conquer." A computer program could be regarded as having

Padovan string, a padovan string p(n) for a natural number n is defined a...

a padovan string p(n) for a natural number n is defined as p(0)=''x'' p(1)=''y'' p(2)=''z'' p(n)=p(n-2)+p(n-3),n>2

Is always the default constructor for fred fred::fred()?, Is always the def...

Is always the default constructor for Fred Fred::Fred()?

Code for design software, In this project, you will write a software for th...

In this project, you will write a software for the Registrar's office of a university called YouOIT to maintain information about students and courses at the university. The reg

Board coloring, programing code on board coloring in clanguage

programing code on board coloring in clanguage

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