Указатели и my_swap

#include <iostream>

using namespace std;

int calc_sum(int a, int b) {
    return a + b;
}

void pointer_teory() {

    int boburbek = 16;
    cout << &boburbek << endl;

    auto pBoburbek = &boburbek;
    cout << pBoburbek << " " << *pBoburbek << endl;

    int *pB2 = &boburbek;

    cout << *(&boburbek) << endl;
    cout << &(*pBoburbek) << endl;

    double PI_val = 3.1415;
    double* pPI_val = &PI_val;
    cout << pPI_val << " " << *pPI_val << endl;
    cout << &PI_val << " " << PI_val << endl;

    int a = 5, b = 7, c = 13;
    int *pa = &a, *pb = &b, *pc = &c;
    *pc = *pa + *pb;
    cout << "C: " << c << endl;
}

void my_swap2(int* pa, int* pb) {
    cout << "IN FUN: " << *pa << *pb << endl;
    int tmp = *pb;
    *pb = *pa;
    *pa = tmp;
    cout << "IN FUN: " << *pa << *pb << endl;
}

void my_swap(int& a, int& b) {
    //cout << "IN FUN: " << a << b << endl;
    int tmp = b;
    b = a;
    a = tmp;
    //cout << "IN FUN: " << a << b << endl;
}



void test_swap() {


    int a = 5, b = 7, c = 9, d = 11;

    cout << a << " " << b << " "
        << c << " " << d << endl;

    my_swap(a, b);

    //swap(a, b);
    // do it

    // case 1 (Memory)
    //int tmp = b;
    //b = a;
    //a = tmp;
    //tmp = d;
    //d = c;
    //c = tmp;

    // case 2 (Operation)
    //a = a + b;
    //b = a - b;
    //a = a - b;


    cout << a << " " << b << " "
        << c << " " << d << endl;


    //pointer_teory();
}

void show_arr(int size, int arr[]) {
    for (int k = 0; k < size; k++)
        cout << arr[k] << " ";
    cout << endl;
}

void shafle() {
    int arr[]{ 1,2,3,4,5 };
    show_arr(5, arr);


    for (int m = 0; m < 5; m++) {
        int k = rand() % 5;
        int n = rand() % 5;
        my_swap(arr[k], arr[n]);
    }

    show_arr(5, arr);
    //cout << k << " " << n << endl;
}

int main() {
    srand(time(NULL));
    shafle();
    return 0;
}