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  1. #define null NULL
  2. #define max_data 3
  3.  
  4. #include<stdio.h>
  5. #include<stdlib.h>
  6. #include<string.h>
  7.  
  8. typedef struct{
  9. 	int x,
  10. 	    y;
  11. }data_t;
  12.  
  13. data_t data[] = {{5, 5}, {3,4}, {8, 1}};//最大３個
  14.  
  15.  
  16. void show(){
  17. 	for(int i=0;i<max_data;i++){
  18. 		printf("data[%d] = (%d, %d)\n", i, data[i].x, data[i].y);
  19. 	}
  20. 	printf("\n");
  21. }
  22. int main(){
  23. 	//関数のプロトタイプ宣言
  24. 	void ini();
  25. 	void set();
  26. 	void file_writer(const char*);
  27. 	void file_reader(const char*);
  28.  
  29. 	//処理
  30.  
  31. 	show();
  32.  
  33. 	printf("ファイルに書き込み\n");	file_writer("data01.dat");
  34.  
  35. 	printf("\n初期化\n");
  36. 	ini();	show();
  37.  
  38. 	printf("ファイルから読み込み\n");	file_reader("data01.dat");
  39.  
  40. 	show();
  41.  
  42. 	return 0;
  43. }
  44.  
  45. void ini(){
  46. 	memset(data, 0, sizeof(data_t)*max_data);
  47. }
  48.  
  49. void file_writer(const char* fname){
  50. 	FILE *fp;
  51.  
  52. 	if( (fp = fopen(fname, "wb")) == null){
  53. 		printf("ファイル作成に失敗しました");
  54. 		fclose(fp);
  55. 		return;
  56. 	}
  57. 	fwrite(data, sizeof(data_t)*max_data, 1, fp);
  58.  
  59. 	fclose(fp);
  60. }
  61. void file_reader(const char* fname){
  62. 	FILE *fp;
  63.  
  64. 	if( (fp = fopen(fname, "rb")) == null){
  65. 		printf("ファイル読み込みに失敗しました");
  66. 		fclose(fp);
  67. 		return;
  68. 	}
  69. 	fread(data, sizeof(data_t)*max_data, 1, fp);
  70.  
  71. 	fclose(fp);
  72. }
  73.  
Runtime error #stdin #stdout 0s 3428KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/VlQDz9
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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