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  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. struct student {
  6. 	char	name[20];
  7. 	double	height;
  8. 	double	weight;
  9. 	double	bmi;
  10. };
  11.  
  12. // ファイルのオープン
  13. FILE *file_open(void)
  14. {
  15. 	FILE	*fp;
  16. 	char	s[100];
  17.  
  18. 	printf("file name = ");
  19. 	scanf("%s", s);
  20. 	fp = fopen(s, "rt");
  21. 	return fp;
  22. }
  23.  
  24. // データ構造の用意
  25. struct student *malloc_data(int *pc, FILE *fp)
  26. {
  27. 	struct student *data;
  28. 	char	buf[100];
  29.  
  30. 	while (fgets(buf, 100, fp)) (*pc)++;
  31. 	data = (struct student *)malloc(*pc * sizeof (struct student));
  32. 	rewind(fp);
  33. 	return data;
  34. }
  35.  
  36. // データの読み込み
  37. void read_data(struct student *data, int c, FILE *fp)
  38. {
  39. 	char	buf[100];
  40. 	int	i;
  41.  
  42. 	for (i = 0; fgets(buf, 100, fp); i++) {
  43. 		sscanf(buf, "%s %lf %lf", data[i].name, &data[i].height, &data[i].weight);
  44. 	}
  45. }
  46.  
  47. // BMIの算出
  48. void calc_bmi(struct student *data, int c)
  49. {
  50. 	int	i;
  51. 	double	h;
  52.  
  53. 	for (i = 0; i < c; i++) {
  54. 		h = data[i].height / 100;
  55. 		data[i].bmi = data[i].weight / (h * h);
  56. 	}
  57. }
  58.  
  59. // BMIの大きい者順に並べ替える
  60. void sort_bmi(struct student *data, int c)
  61. {
  62. 	struct student t;
  63. 	int	i, j;
  64.  
  65. 	for (i = 0; i < c - 1; i++) {
  66. 		for (j = i + 1; j < c; j++) {
  67. 			if (data[i].bmi < data[j].bmi) {
  68. 				t = data[i];
  69. 				data[i] = data[j];
  70. 				data[j] = t;
  71. 			}
  72. 		}
  73. 	}
  74. }
  75.  
  76. // 画面表示
  77. void print_data(struct student *data, int c)
  78. {
  79. 	int	i;
  80.  
  81. 	for (i = 0; i < c; i++) {
  82. 		printf("%s BMI=%f", data[i].name, data[i].bmi);
  83. 		if (data[i].bmi > 25) printf(" himan");
  84. 		printf("\n");
  85. 	}
  86. }
  87.  
  88. int main(void)
  89. {
  90. 	struct student *data;
  91. 	FILE	*fp;
  92. 	int	c = 0;
  93.  
  94. 	fp = file_open();		// ファイルのオープン
  95. 	if (fp == NULL) {
  96. 		fprintf(stderr, "file open error\n");
  97. 		return 1;
  98. 	}
  99. 	data = malloc_data(&c, fp);	// データ構造の用意
  100. 	read_data(data, c, fp);		// データの読み込み
  101. 	calc_bmi(data, c);		// BMIの算出
  102. 	sort_bmi(data, c);		// BMIの大きい者順に並べ替える
  103. 	print_data(data, c);		// 画面表示
  104.  
  105. 	free(data);
  106. 	fclose(fp);
  107. 	return 0;
  108. }
  109.  
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https://ideone.com/skUbt
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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