311_1902

#include <iostream>
#include <iomanip>


void prefix_vs_postfix() {

    int k = 5;
    std::cout << k << "\n";
    k++;
    std::cout << k << "\n";
    ++k;
    std::cout << k << "\n";
    double y = 1.5;
    y++;
    std::cout << y << "\n";

    // ++k - сначала k увеличится на 1, а затем присвоится в n
    int n = ++k;
    std::cout << "k:" << k << " n:" << n << "\n";
    k = 7;
    // ++k - сначала k присвоится в m, а затем увеличится на 1
    int m = k++;
    std::cout << "k:" << k << " m:" << m << "\n";

    k = 7;
    std::cout << "k++: " << k++ << "\n";
    std::cout << "k: " << k << "\n";

    k = 7;
    std::cout << "++k: " << ++k << "\n";
    std::cout << "k: " << k << "\n";

    int a = 5;

    std::cout << "a: " << a << "\n";
    std::cout << "a++ + (-a * ++a): " << a++ + (-a * ++a) << "\n";
    std::cout << "a: " << a << "\n";

    a = 5;
    std::cout << "a: " << a << "\n";
    std::cout << "++a + (-a * ++a): " << ++a + (-a * ++a) << "\n";
    std::cout << "a: " << a << "\n";
}

int counter = 0;

long long factorial0(int n) {

    std::cout << "Start factorial " << counter << "\n";
    long long result = n;
    while (n > 2) {
        n--;
        result *= n;
    }
    counter++;
    return result;
}


long long factorial1(int n) {

    std::cout << "Start factorial " << counter << "\n";
    long long result = n;
    while (n > 2)
        result *= --n;

    counter++;
    return result;
}


void multy_tab() {

    int k = 0, n = 0;
    while (n <= 9) {
        k = 0;
        while (k <= 9) {
            std::cout << std::setw(2) << n * k++ << " ";
        }
        std::cout << "\n";
        n++;
    }

}


int main() {
    //prefix_vs_postfix();
    //std::cout << !5 << std::endl;
    /*std::cout << "2! = " << factorial0(2) << std::endl;
    std::cout << "5! = " << factorial1(5) << std::endl;
    std::cout << "4! = " << factorial0(4) << std::endl;
    std::cout << "3! = " << factorial0(3) << std::endl;
    std::cout << "6! = " << factorial1(6) << std::endl;
    */
    multy_tab();




    return 0;
}