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  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4. using namespace std;
  5. class File
  6. {
  7. 	string name;
  8. 	fstream fs;
  9. public:
  10. 	File( string name1):name(name1){};
  11. 	bool open(int mode=0);// 0 - read, else - write
  12. 	fstream &get_stream() {return fs;}
  13. 	string get_name() {return name;}
  14. 	~File() {fs.clear(); fs.close(); }
  15. };
  16. bool File::open(int mode)
  17. {
  18. 	if(mode==0)
  19. 		fs.open(name.c_str(),ios::in);
  20. 	else
  21. 		fs.open(name.c_str(),ios::out);
  22. 	if(!fs)
  23. 	{
  24. 		return false;
  25. 	}
  26. 	return true;
  27. }
  28. class Str
  29. {
  30. 	string str;
  31. 	string max_str;
  32. 	unsigned max_len;
  33. public:
  34. 	Str():max_len(0),str(""),max_str(""){}
  35. 	string read_file_find_max(fstream &f);
  36. 	void write_file(fstream &f);
  37. };
  38. string Str::read_file_find_max(fstream &f)
  39. {
  40. 	while(!f.eof())
  41. 	{
  42. 		getline(f,str);
  43. 		if(str.length() > max_len)
  44. 		{
  45. 			max_len=str.length();
  46. 			max_str=str;
  47. 		}
  48. 		f>>ws;
  49. 	}
  50. 	return max_str;
  51. }
  52. void Str::write_file(fstream &f)
  53. {
  54. 	string s;
  55. 	while(1)
  56. 	{
  57. 		getline(cin,s);
  58. 		if(s=="") // ввели просто Enter- закончили ввод
  59. 			break;
  60. 		f<<s;
  61. 		f<<endl;
  62. 	}
  63. }
  64.  
  65.  
  66. int main()
  67. {
  68. 	File *file;
  69. 	Str *s;
  70. 	string m; 
  71. 	// читаем из файла
  72. 	file=new File("f.txt");
  73. 	file->open();
  74. 	s= new Str;
  75. 	m = s->read_file_find_max(file->get_stream());
  76. 	cout << m << endl;
  77. 	delete file;
  78. 	delete s;
  79.  
  80. 	// пишем в файл
  81. 	file = new File("f2.txt");
  82. 	file->open(1);
  83. 	s= new Str;
  84. 	s->write_file(file->get_stream());
  85. 	delete file;
  86. 	delete s;
  87.  
  88. 	//читаем из созданного файла
  89. 	file=new File("f2.txt");
  90. 	file->open();
  91. 	s= new Str;
  92. 	m = s->read_file_find_max(file->get_stream());
  93. 	cout << m << endl;
  94. 	delete file;
  95. 	delete s;
  96. }
  97. /*
  98. f.txt
  99. sdfsdf fgedf
  100.  
  101. ssdf
  102. sdfffffffff fgfgff
  103. --------------
  104. f2.txt (тот, что ввели с клавиатуры)
  105. 123 rtrt
  106. 11111111111112 455555
  107. sdd
  108. fggf fg
  109.  
  110. */
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/hkgqpQ
language:
C++ 4.3.2 (gcc-4.3.2)
created:
11 days ago
visibility:
public

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