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:
// 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; } |
Output:
Value of a before: 10 Value of b before: 20 Value of a now: 20 Value of b now: 10
Program 2:
#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; } |
Output:
Value of a before: Geeks Value of b before: function Value of a now: function Value of b now: Geeks
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