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We has discussed how we implement call by reference concept using pointers. Here is another example of call by reference which makes use of C++ reference:
#include <iostream> using namespace std; // function declaration void swap(int& x, int& y); int main () { // local variable declaration: int a = 100; int b = 200; cout << "Before swap, value of a :" << a << endl; cout << "Before swap, value of b :" << b << endl; /* calling a function to swap the values.*/ swap(a, b); cout << "After swap, value of a :" << a << endl; cout << "After swap, value of b :" << b << endl; return 0; } // function definition to swap the values. void swap(int& x, int& y) { int temp; temp = x; /* save the value at address x */ x = y; /* put y into x */ y = temp; /* put x into y */ return; } |
When the above code is compiled and executed, it produces following result:
Before swap, value of a :100 Before swap, value of b :200 After swap, value of a :200 After swap, value of b :100 |
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