cppIfBasics

#include <iostream>

int main()
{
    int mark{ 4 };

    int num{};

    bool flag{};

    std::cout << "Enter your mark\n";
    std::cin >> mark;

    if (flag == false)
    {
        // false
    }
    else
    {
        // true
    }

    if (num > 0)
    {
        // >0
    }
    else
    {
        if (num < 0)
        {
            // < 0
        }
        else
        {
            // == 0
        }

    }

    if (mark > 3)
    {
        std::cout << "You pass exam!\n";

        if (mark == 5)
        {
            std::cout << "Nice work!Hurra!\n";
        }
        else
        {
            std::cout << "Oh, not bad! :)\n";
        }
    }
    else
    {
        std::cout << "Exam failed! Bad luck! Try again! :(\n";
    }
}