swap() in C++

The function std::swap() is a built-in function in the C++ Standard Template Library (STL) which swaps the value of two variables.

Syntax:

swap(a, b)

Parameters: The function accepts two mandatory parameters a and b which are to be swapped. The parameters can be of any data type.



Return Value: The function does not return anything, it swaps the values of the two variables.

Programs below illustrate the swap() function:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program for illustration of swap() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    int a = 10;
    int b = 20;
    cout << "Value of a before: " << a << endl;
    cout << "Value of b before: " << b << endl;
  
    // swap values of the variables
    swap(a, b);
    cout << "Value of a now: " << a << endl;
    cout << "Value of b now: " << b << endl;
    return 0;
}

chevron_right


Output:

Value of a before: 10
Value of b before: 20
Value of a now: 20
Value of b now: 10

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    string a = "Geeks";
    string b = "function";
    cout << "Value of a before: " << a << endl;
    cout << "Value of b before: " << b << endl;
    swap(a, b);
    cout << "Value of a now: " << a << endl;
    cout << "Value of b now: " << b << endl;
    return 0;
}

chevron_right


Output:

Value of a before: Geeks
Value of b before: function
Value of a now: function
Value of b now: Geeks


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.



Improved By : mhgeeksforgeeks



Article Tags :
Practice Tags :


10


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.