Example: Swap Two Numbers Without using Third Variable in C++ language

C
C++
C#
Java
Python
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// Swap Two Numbers Without using Third Variable in C++ language
#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    double p, q;

    cout << "----Enter the two integer or real numbers----\n";
    cin >> p >> q;

    p = p - q;
    q = p + q;
    p = q - p;

    std::cout << std::fixed << std::setprecision(2) << "After swapping, p = " << p << "\n";
    std::cout << std::fixed << std::setprecision(2) << "After swapping, q = " << q << "\n";
    return 0;
}