C++でsin関数を使いこなすための6つの方法

#include <iostream>
#include <cmath> // cmathライブラリをインクルード

int main() {
    double degree = 90.0; // 角度を90度に設定
    double radian = degree * M_PI / 180.0; // 角度をラジアンに変換
    double result = sin(radian); // sin関数を用いて計算

    std::cout << "sin(" << degree << "度) = " << result << std::endl;

    return 0;
}

#include <iostream>
#include <cmath>

int main() {
    double degrees = 30.0; // 角度を30度に設定
    double radians = degrees * M_PI / 180.0; // ラジアンに変換
    double result = sin(radians); // sin関数を使って計算

    std::cout << "The sine of 30 degrees is: " << result << std::endl;

    return 0;
}

#include <iostream>
#include <cmath>

int main() {
    double degrees = 45.0; // 角度を45度に設定
    double radians = degrees * M_PI / 180.0; // ラジアンに変換

    std::cout << "45 degrees in radians is: " << radians << std::endl;

    return 0;
}

#include <iostream>
#include <cmath>
#include <fstream>

int main() {
    std::ofstream file("sine_wave.txt"); // ファイル出力の準備
    for (int degrees = 0; degrees <= 360; degrees += 10) { // 0度から360度まで10度刻み
        double radians = degrees * M_PI / 180.0; // ラジアンに変換
        double result = sin(radians); // sin値を計算
        file << "sin(" << degrees << " degrees) = " << result << std::endl;
    }
    file.close(); // ファイルを閉じる

    return 0;
}

#include <SFML/Graphics.hpp>
#include <cmath>

int main() {
    sf::RenderWindow window(sf::VideoMode(800, 600), "Sine Wave Animation");
    sf::VertexArray sineWave(sf::LineStrip, 800);

    while (window.isOpen()) {
        sf::Event event;
        while (window.pollEvent(event)) {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        window.clear();
        for (int i = 0; i < 800; i++) {
            float height = 300 * sin(i * M_PI / 180);
            sineWave[i].position = sf::Vector2f(i, 300 + height);
            sineWave[i].color = sf::Color::White;
        }

        window.draw(sineWave);
        window.display();
    }

    return 0;
}

#include <iostream>
#include <fstream>
#include <cmath>

const int SAMPLE_RATE = 44100; // サンプリングレート
const int FREQUENCY = 440; // Aの音（Hz）
const int DURATION = 2; // 2秒間

int main() {
    std::ofstream file("tone.wav", std::ios::binary);
    // WAVファイルのヘッダー等を設定するコードは省略

    for (int i = 0; i < SAMPLE_RATE * DURATION; i++) {
        double amplitude = 32760; // 最大振幅
        double value = amplitude * sin((2 * M_PI * FREQUENCY * i) / SAMPLE_RATE);
        file.put((int)value & 0xFF);
        file.put(((int)value >> 8) & 0xFF);
    }

    file.close();
    return 0;
}

#include <iostream>
#include <vector>
#include <cmath>

const int N = 1000; // サンプル数
const double PI = 3.14159265358979323846;

std::vector<double> fourierTransform(const std::vector<double>& signal) {
    std::vector<double> transformed(N, 0.0);

    for (int k = 0; k < N; k++) {
        double sumReal = 0.0;
        double sumImag = 0.0;
        for (int n = 0; n < N; n++) {
            double angle = 2 * PI * k * n / N;
            sumReal += signal[n] * cos(angle);
            sumImag += signal[n] * sin(angle);
        }
        transformed[k] = sqrt(sumReal * sumReal + sumImag * sumImag);
    }

    return transformed;
}

int main() {
    std::vector<double> signal(N, 0.0);
    // 信号の生成コードは省略
    std::vector<double> output = fourierTransform(signal);

    for (double v : output) {
        std::cout << v << "\n";
    }

    return 0;
}

#include <iostream>
#include <string>
#include <cmath>

int main() {
    std::string input;
    std::cout << "Enter a number: ";
    std::cin >> input;

    try {
        double degree = std::stod(input); // 文字列を数値に変換
        double radian = degree * M_PI / 180.0;
        double result = sin(radian);
        std::cout << "sin(" << degree << " degrees) = " << result << std::endl;
    } catch (const std::invalid_argument& e) {
        std::cout << "Error: Invalid number entered." << std::endl;
    }

    return 0;
}

#include <iostream>
#include <cmath>

int main() {
    double degrees = 1e10;  // 非常に大きな数値
    double radian = degrees * M_PI / 180.0;
    double result = sin(radian);
    std::cout << "sin(" << degrees << " degrees) = " << result << std::endl;

    return 0;
}

#include <iostream>
#include <cmath>

int main() {
    float degree_f = 45.0f;  // float型
    double degree_d = 45.0;  // double型

    float radian_f = degree_f * static_cast<float>(M_PI) / 180.0f;
    double radian_d = degree_d * M_PI / 180.0;

    std::cout << "sin(45 degrees) as float: " << sin(radian_f) << std::endl;
    std::cout << "sin(45 degrees) as double: " << sin(radian_d) << std::endl;

    return 0;
}