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  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. #define GAKUSEI_MAX 100
  6. #define BUF_SIZE 256
  7.  
  8. int main()
  9. {
  10. 	FILE *file;
  11. 	char buf[BUF_SIZE];
  12. 	int a[GAKUSEI_MAX][4];
  13. 	int t[4];
  14. 	int ninzuu, kamoku, i, j;
  15.  
  16. 	printf("学生の人数を入力してください。");
  17. 	do {
  18. 		scanf("%d", &ninzuu);
  19. 	} while (GAKUSEI_MAX < ninzuu);
  20.  
  21. 	// 読み込み
  22. 	file = fopen("seiseki.txt", "rt");
  23. 	if (file == NULL) {
  24. 		return 1;
  25. 	}
  26. 	fgets(buf, BUF_SIZE, file); // ヘッダ行読み飛ばし
  27. 	for (i = 0; i < ninzuu; i++) {
  28. 		j = fscanf(file, "%d%d%d%d", &a[i][0], &a[i][1], &a[i][2], &a[i][3]);
  29. 		if (j != 4) break;
  30. 	}
  31. 	ninzuu = i;
  32. 	fclose(file);
  33.  
  34. 	printf("科目番号を入力してください。\n");
  35. 	printf("1:国語、2:数学、3:英語\n");
  36. 	do {
  37. 		scanf("%d", &kamoku);
  38. 	} while (kamoku < 1 || 3 < kamoku);
  39.  
  40. 	// 並べ替え
  41. 	for (i = 0; i < ninzuu-1; i++) {
  42. 		for (j = 0; j < ninzuu-1-i; j++) {
  43. 			if (a[j][kamoku] > a[j+1][kamoku]) {
  44. 				memcpy(t, a[j], sizeof t);
  45. 				memcpy(a[j], a[j+1], sizeof t);
  46. 				memcpy(a[j+1], t, sizeof t);
  47. 			}
  48. 		}
  49. 	}
  50.  
  51. 	// 書き込み
  52. 	file = fopen("write.txt", "wt");
  53. 	if (file == NULL) {
  54. 		return 1;
  55. 	}
  56. 	for (i = 0; i < ninzuu; i++) {
  57. 		fprintf(file, "%d %d %d %d\n", a[i][0], a[i][1], a[i][2], a[i][3]);
  58. 	}
  59. 	fclose(file);
  60.  
  61. 	return 0;
  62. }
  63.  
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https://ideone.com/g8FQy
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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