x007.h

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#pragma once

#include "xmath.h"
#include "xphysics.h"
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <vector>

namespace nmx::apps::x007 {

inline void ex1() {
    std::cout << std::scientific << std::setprecision(3);

    //Name der Spalten (erste Reihe)
    std::cout << "phi [deg]" //
              << std::setw(15) << "phi [rad]" //
              << std::setw(15) << "cos(phi)" //
              << std::setw(15) << "sin(phi)" //
              << std::setw(15) << "tan(phi)" << std::endl;

    for (double phi = 0; phi <= 90; phi += 30) {
        double phiRad = Math::to_radians(phi);
        std::cout << phi //
                  << std::setw(15) << phiRad //
                  << std::setw(15) << cos(phiRad) //
                  << std::setw(15) << sin(phiRad);
        if (Math::cmp(phiRad, 0.5 * Math::PI, 1e-9) == 0) {
            std::cout << std::setw(15) << "nan" << std::endl;
        } else {
            std::cout << std::setw(15) << tan(phiRad) << std::endl;
        }
    }
}

inline void ex2() {
    using namespace gravitation;
    const double m = 720;
    std::cout << std::scientific << std::setprecision(3);
    //Namen der Spalten (erste Reihe)
    std::cout << "alpha" << std::setw(12) << "r" << std::setw(12) //
              << "force" << std::setw(12) << "g1" << std::setw(12) //
              << "g1/g0" << std::endl;
    //berechne Daten
    for (double alpha : { 1.55, 1.75, 1.81, 1.92 }) {
        const double c = 1 + alpha;
        const double r = alpha * Earth::radius;
        const double force = Astronomy::G * Earth::mass * m / pow(r, 2);
        const double g1 = Earth::g / pow(c, 2);
        std::cout << alpha << std::setw(12) << r << std::setw(12) //
                  << force << std::setw(12) << g1 << std::setw(12) //
                  << g1 / Earth::g << std::endl;
    }
}

inline void ex3() {
    //Synonym für den Typ des Wertepaares
    using Item = std::pair<double, double>;
    //Container zur Speicherung der Werte
    std::vector<Item> values;
    //der Container wird gefüllt
    for (double a = 2; a < 50; a += 1) {
        values.push_back({ a, std::pow(a, 1.5) });
    }
    //Filter
    auto filter = []() {
        static size_t d = 1;
        //wenn nicht 10 erhöhe Wert um 1
        d = (d == 10) ? 1 : d + 1;
        return d == 1;
    };
    //Schreibe jedes n-te Element heraus
    for (const auto &item : values) {
        if (filter()) {
            std::cout << "(" << item.first << "," //
                      << item.second //
                      << ")" << std::endl;
        }
    }
}

inline void ex4() {
    //lambda zur Generierung von Zahlen
    auto fn = []() {
        static double val = 0;
        return val += 2; //erste Zahl ist die 2
    };
    //C-Feld erzeuge Speicher für 9 Elemente
    const size_t n = 9;
    int values[9];
    std::generate_n(values, n, fn);
    //Ausgabe auf dem Bildschirm
    for (auto x : values) {
        std::cout << x << ",";
    }
    std::cout << std::endl;
}
} // namespace nmx::apps::x007