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Passing parameters by references in C++
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;
}
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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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