Pass By Reference - Function

Pass by reference or Call by reference is the method by which the address of the variables are passed to the function. The "&" symbol is used to refer the address of the variables to the function.

Example :

#include <iostream.h> void main( ) { void changes( int& , int& ); int x =10, y=20; cout << "Value of X is::" << x << '\n'; cout << "Value of Y is::" << y << '\n'; changes(x,y); cout << "Changed value of X is::" << x << '\n'; cout << "Changed value of Y is::" << y << '\n'; } void changes(int& a, int& b) { a = a* 10; b = b*100; }

Result :
In the above example the product of the numbers are calculated by passing the address of "x,y" to the variables "a,b" to the function "changes". This is the function calls in C++.