lesson322_22

#include <iostream>

using namespace std;

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

void test_reference() {
    int very_long_name = 18;
    int *pv = &very_long_name;
    int &ref = very_long_name;

    cout << very_long_name << " "
        << *pv << " " << ref << endl;

    ++(*pv);
    cout << very_long_name << " "
        << *pv << " " << ref << endl;

    cout << &ref << " " << pv << " "
        << &very_long_name << endl;

    int y = 222;
    ref = y;

    cout << very_long_name << " "
        << *pv << " " << ref << endl;

    int (*ref2)(int, int) = summ;
    cout << ref2(13, 344) << endl;

    int arr[]{ 3,4,5,6,7,8,9 };
    int& favorite = arr[4];
}

void task1() {
    int x = 4, y = 3;
    int* px = &x, * py = &y;
    cout << "max: " <<
        ((*px > *py)? *px : *py);
}

void task_pasport() {
    int index[4]{ 6,0,2,1 };
    int number[6]{ 7,3,2,7,7,7 };

    int* pas[]{ index, number };

    cout << pas[0][3] << endl;
    cout << pas[1][2] << endl;

    for (int k = 0; k < 10; k++) {
        cout << k % 2 << " ";
    }
    // pas[0][1];
}

// BAD
void my_swap1(int a, int b) {
    int temp = a;
    a = b;
    b = temp;
    cout << "In: ";
    cout << a << " " << b << endl;
}

// BAD
void my_swap2(int *pa, int *pb) {
    int* ptemp = pa;
    pa = pb;
    pb = ptemp;
    cout << "In: ";
    cout << *pa << " " << *pb << endl;
}

void my_swap3(int *pa, int *pb) {
    int temp = *pa;
    *pa = *pb;
    *pb = temp;
    cout << "In: ";
    cout << *pa << " " << *pb << endl;
}
void my_swap(int &a, int &b) {
    int temp = a;
    a = b;
    b = temp;
    cout << "In: ";
    cout << a << " " << b << endl;
}



void test_swap() {
    int x = 6;
    int y = 4;
    my_swap(x, y);
    //my_swap3(&x, &y);

    cout << "Out: ";
    cout << x << " " << y << endl;
    // Output: 4 6
}

int main(){
    //test_reference();
    //task1();
    //task_pasport();
    //test_swap();
}