lesson322_21

#include <iostream>

using namespace std;

char glob = 'G';

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

void test_address() {
	int d = 7;
	double x = 3.14;

	bool arr[]{ true, false, true, false };

	cout << &d << " " << &x << " "
		<< arr << " " << sum << endl;

	cout << &(arr[0]) << endl;
	cout << &(arr[3]) << endl;

	// Взять адрес от rvalue - нельзя
	//cout << &(3) << &(sum(1, 2)) << &(x + 1);

	int* pd = &d;
	cout << "int pointer: ";
	cout << pd << " " << &d << endl;

	double* px = &x;
	cout << "double pointer: ";
	cout << px << " " << &x << endl;

	cout << "get value: ";
	cout << d << " " << *pd << endl;

	bool* pArr = arr;
	bool* pArr2 = &(arr[0]);
	cout << *pArr << endl;
	cout << *(pArr + 1) << " " << arr[1] << endl;
}

void task_pointers_array() {
	int arr[]{ 3,4,6,4,2,2 };
	for (int k = 0; k < size(arr); k++) {
		cout << *(arr + k) << " "
			<< arr + k << endl;
	}

	for (int* pk = arr; pk != arr + size(arr); pk++) {
		cout << *pk << " ";
	}
	cout << endl;
	// arr[k] ~ *(arr + k)



	/*
	int k = 0;
	for (;;) {
		k++;
		if (k > 5)
			break;
	}
	*/
	cout << endl;
}

void task2() {
	int x = 15;
	int y = 19;

	int* px;
	px = &x;
	int* py = &y;

	cout << x << " " << px << endl;
	cout << y << " " << py << endl;

	// суммировать адреса безсмысленно
	// cout << px + py << endl;
	// cout << px * py << endl;
	// cout << px / py << endl

	cout << px - py << endl;
	*px = 18; // *px - это как бы x - lvalue
	cout << x << endl;
	px = py;

	cout << *px << " "
		 << *py << " "
		 << y << endl;
}

int main() {
	//test_address();
	//task_pointers_array();
	task2();
	return 0;
}