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  1. /**
  2.  * @file        q11210332221.c
  3.  * @brief       サンプルプログラム
  4.  * @author      Keitetsu
  5.  * @date        2019/07/12
  6.  * @copyright   Copyright (c) 2019 Keitetsu
  7.  * @par         License
  8.  *              This software is released under the MIT License.
  9.  */
  10.  
  11. #include <stdio.h>
  12. #include <stdlib.h>
  13. #include <math.h>
  14.  
  15.  
  16. #define N_DATA      (720)   /**< Number of data */
  17.  
  18.  
  19. size_t set_wave_data(void *array, size_t array_size);
  20.  
  21.  
  22. int main(int argc, char *argv[])
  23. {
  24.     double *array;
  25.     size_t array_size;
  26.     size_t ret_val;
  27.     FILE *fp;
  28.     size_t t;
  29.  
  30.     array_size = sizeof(double) * N_DATA;
  31.     array = (double *)malloc(array_size);
  32.     if (array == NULL) {
  33.         fprintf(stderr, "[ERROR] Failed to allocate memory.\n");
  34.         return 1;
  35.     }
  36.  
  37.     ret_val = set_wave_data(array, array_size);
  38.  
  39.     fp = fopen("wave_data.csv", "w");
  40.     if (fp == NULL) {
  41.         fprintf(stderr, "[ERROR] Failed to open the file.\n");
  42.         free(array);
  43.         return 2;
  44.     }
  45.  
  46.     for (t = 0; t < ret_val; t++) {
  47.         fprintf(fp, "%zu, %lf\n", t, array[t]);
  48.     }
  49.  
  50.     fclose(fp);
  51.  
  52.     free(array);
  53.  
  54.     return 0;
  55. }
  56.  
  57.  
  58. size_t set_wave_data(void *array, size_t array_size)
  59. {
  60.     size_t n_data;
  61.     size_t t;
  62.  
  63.     n_data = array_size / sizeof(double);
  64.  
  65.     for (t = 0; t < n_data; t++) {
  66.         ((double *)array)[t] = sin(t * M_PI / 180.0);
  67.     }
  68.  
  69.     return t;
  70. }
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