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

Decode the given code, write c++ program to decode the given code. in mobil...

write c++ program to decode the given code. in mobile keypad the integers from 1 to 9 will display the characters from a to z and 0 will assign a space

Described local class? why can it be useful?, It is a class defined in the ...

It is a class defined in the scope of a function _ any function, whether a member functions or a free function. For instance: // Example : Local class // int f() { c

Explain reusability, Reusability  Reusability means reusing code writte...

Reusability  Reusability means reusing code written earlier, may be from some earlier project or from the library. Reusing old code not only saves development time, but also sa

Develop a windows application to show computer hardware, - But with less fe...

- But with less features and more user-friendly (particularly for non-tech savvy users). - Software needed having a left menu with links (no pictures required) for every hardwar

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

Volume, how to find the volume of cone , cylinder and sphere ?

how to find the volume of cone , cylinder and sphere ?

C program to swap two numbers using reference arguments, Aim: To implement...

Aim: To implement a program to swap two numbers using reference arguments. Code: void swap(int *a, int *b) {             int temp;             temp=*a;

, Question 1 / 1 You have an N x N chessboard and you wish to place N king...

Question 1 / 1 You have an N x N chessboard and you wish to place N kings on it. Each row and column should contain exactly one king, and no two kings should attack each other (two

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