C++ bilan tanishuv

#include <print>
#include <string>
#include <vector>
#include <algorithm>

int main()
{
    std::println("Salom, dunyo!");
    return 0;
}

#include <cstdio>
#include <iostream>

int main()
{
    int yosh = 25;

    std::printf("printf:   yosh = %d\n", yosh);
    std::cout << "cout:     yosh = " << yosh << "\n";
    std::println("println:  yosh = {}", yosh);

    return 0;
}

int main()
{
    // C uslubi - qo'lda xotira boshqarish
    int* eskiUsul = new int[5];
    for (int i = 0; i < 5; i++) {
        eskiUsul[i] = i * i;
    }
    std::print("qo'lda:  ");
    for (int i = 0; i < 5; i++) {
        std::print("{} ", eskiUsul[i]);
    }
    delete[] eskiUsul;        // UNUTILSA - xotira sizib chiqadi
    std::println("");

    // C++ uslubi - xotira o'zi boshqariladi
    std::vector<int> yangiUsul;
    for (int i = 0; i < 5; i++) {
        yangiUsul.push_back(i * i);
    }
    std::println("vector:  {}", yangiUsul);
    // delete kerak emas - vector o'zini o'zi tozalaydi

    return 0;
}

int main()
{
    std::vector<std::string> ismlar{
        "Nodira", "Husanboy", "Malika", "Aziza"
    };

    // C++98 uslubi
    std::sort(ismlar.begin(), ismlar.end());
    std::println("C++98:  {}", ismlar);

    // C++20 uslubi - ranges
    std::vector<std::string> boshqa{"Kamola", "Dilnoza", "Bekzod"};
    std::ranges::sort(boshqa);
    std::println("C++20:  {}", boshqa);

    // C++20 - eng uzun ismni topish
    auto engUzun = std::ranges::max_element(ismlar,
        [](const std::string& a, const std::string& b) {
            return a.size() < b.size();
        });
    std::println("eng uzun: {}", *engUzun);

    return 0;
}

#include <numeric>

int main()
{
    std::vector<int> sonlar{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    // Qo'lda halqa
    int qolda = 0;
    for (std::size_t i = 0; i < sonlar.size(); ++i) {
        qolda += sonlar[i];
    }

    // Standart algoritm
    int algoritm = std::accumulate(sonlar.begin(), sonlar.end(), 0);

    // Ranges (C++20)
    int diapazon = 0;
    for (int x : sonlar) {
        diapazon += x;
    }

    std::println("qo'lda:    {}", qolda);
    std::println("algoritm:  {}", algoritm);
    std::println("diapazon:  {}", diapazon);
    std::println("uchalasi teng: {}",
                 qolda == algoritm && algoritm == diapazon);

    return 0;
}

int main()
{
    struct Standart {
        const char* nom;
        int yil;
        const char* asosiy;
    };

    Standart standartlar[] = {
        {"C++98", 1998, "STL, shablonlar, istisnolar"},
        {"C++11", 2011, "auto, lambda, move, smart pointer"},
        {"C++14", 2014, "kichik tuzatishlar"},
        {"C++17", 2017, "optional, string_view, filesystem"},
        {"C++20", 2020, "ranges, concepts, modules, coroutine"},
        {"C++23", 2023, "print, expected, mdspan"},
    };

    std::println("{:<8} {:<6} {}", "STANDART", "YIL", "ASOSIY YANGILIK");
    std::println("{}", std::string(58, '-'));

    for (const auto& s : standartlar) {
        std::println("{:<8} {:<6} {}", s.nom, s.yil, s.asosiy);
    }

    std::println("");
    std::println("Bu darslik: C++17/20/23");

    return 0;
}