[C言語] 三角関数の表を作成する方法

printf("%3d度: sin = %.3f, cos = %.3f, tan = %.3f\n", degree, sinValue, cosValue, tanValue);

#include <stdio.h>
#include <math.h>
int main() {
    int startDegree = 0;
    int endDegree = 360;
    int step = 10;
    double pi = 3.14159265358979323846;
    printf("角度 (度) | sin | cos | tan\n");
    printf("-----------------------------\n");
    for (int degree = startDegree; degree <= endDegree; degree += step) {
        double radian = degree * (pi / 180.0);
        double sinValue = sin(radian);
        double cosValue = cos(radian);
        double tanValue = tan(radian);
        printf("%3d度: sin = %.3f, cos = %.3f, tan = %.3f\n", degree, sinValue, cosValue, tanValue);
    }
    return 0;
}

角度 (度) | sin | cos | tan
-----------------------------
  0度: sin = 0.000, cos = 1.000, tan = 0.000
 10度: sin = 0.174, cos = 0.985, tan = 0.176
 20度: sin = 0.342, cos = 0.940, tan = 0.364
...
360度: sin = 0.000, cos = 1.000, tan = 0.000

#include <stdio.h>
#include <math.h>
int main() {
    int sampleRate = 44100; // サンプルレート(Hz)
    double frequency = 440.0; // 周波数(Hz)
    int duration = 1; // 持続時間(秒)
    double pi = 3.14159265358979323846;
    for (int i = 0; i < sampleRate * duration; i++) {
        double t = (double)i / sampleRate;
        double sample = sin(2.0 * pi * frequency * t);
        printf("%.3f\n", sample);
    }
    return 0;
}

#include <stdio.h>
#include <math.h>
int main() {
    FILE *file = fopen("sine_wave.dat", "w");
    if (file == NULL) {
        printf("ファイルを開けませんでした。\n");
        return 1;
    }
    int sampleRate = 44100;
    double frequency = 440.0;
    int duration = 1;
    double pi = 3.14159265358979323846;
    for (int i = 0; i < sampleRate * duration; i++) {
        double t = (double)i / sampleRate;
        double sample = sin(2.0 * pi * frequency * t);
        fprintf(file, "%f %f\n", t, sample);
    }
    fclose(file);
    return 0;
}

set title "Sine Wave"
set xlabel "Time (s)"
set ylabel "Amplitude"
plot "sine_wave.dat" using 1:2 with lines title "440Hz Sine Wave"

#include <stdio.h>
#include <math.h>
int main() {
    double length = 1.0; // 振り子の長さ(メートル)
    double g = 9.81; // 重力加速度(m/s^2)
    double theta0 = 0.1; // 初期角度(ラジアン)
    double timeStep = 0.01; // 時間ステップ(秒)
    double pi = 3.14159265358979323846;
    for (double t = 0; t <= 10; t += timeStep) {
        double theta = theta0 * cos(sqrt(g / length) * t);
        printf("時間: %.2f秒, 角度: %.3fラジアン\n", t, theta);
    }
    return 0;
}