C plus plus program to swap two numbers using friend function as a bridge?

Answer 1

There is no need to use a class to swap two numbers. A template function is all you really need. The following example includes both a template function and a class template with a static method. The template function is clearly the easier of the two to use.

#include<iostream>

template<typename T>

void swap(T& x, T&y)

{

T temp=x; x=y; y=temp;

}

template<typename T>

class foo

{

public:

static void swap(T& x, T& y){T temp=x; x=y; y=temp;}

};

int main()

{

int a=40, b=2;

std::cout<<"a is "<<a<<", b is "<<b<<std::endl;

swap(a,b);

std::cout<<"a is "<<a<<", b is "<<b<<std::endl;

foo<int>::swap(a,b);

std::cout<<"a is "<<a<<", b is "<<b<<std::endl;

}

Example output:

a is 40, b is 2

a is 2, b is 40

a is 40, b is 2

Answer 2

// Use references!

#include <iostream>

using namespace std;

void swap(int& first, int& second) {

int tmp = first;

first = second;

second = tmp;

}

int main() {

int ten = 7;

int seven = 10;

cout << endl << "Ten: " << ten << ", Seven: " << seven << endl;

swap(ten, seven);

cout << endl << "Ten: " << ten << ", Seven: " << seven << endl;

return 0;

}

Answer 3

write a program to swap two value using friend function