#include <iostream>

using namespace std;

void swap(int *a, int *b) {
    a = b;
    b = a;
}

int main() {

    int x1 = 10, x2 = 20;
    cout << "x1 = " << x1 << ", x2 = " << x2 << endl;
    swap(x1, x2);
    cout << "x1 = " << x1 << ", x2 = " << x2 << endl;

    system("pause");
    return 0;
}

usung namespace std;

#include <iostream>

void swap(int *a, int *b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}

int main() {
    int x1 = 10, x2 = 20;
    std::cout << "x1 = " << x1 << ", x2 = " << x2 << std::endl;
    swap(&x1, &x2); // Передаём ссылки
    std::cout << "x1 = " << x1 << ", x2 = " << x2 << std::endl;

    return 0;
}