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  1. // If you are not sure what some lines of code do, try looking back at
  2. // previous example programs, notes, or ask a question.
  3.  
  4. #include <iostream>
  5. #include <fstream>
  6.  
  7. using namespace std;
  8.  
  9. int main() {
  10.  
  11. 	// Declare arrays of strings, ints, and chars to be inputted from 
  12. 	// the file
  13. 	string strings[5] = {};
  14. 	int ints[5] = {}, numInts, numChars;
  15. 	char chars[5] = {};
  16.  
  17. 	// Declare variables to be used with our files
  18. 	ifstream fin;
  19. 	ofstream fout;
  20.  
  21. 	// Open the file in the input stream - note you must include
  22. 	// the file extension (".txt").
  23. 	fin.open("File IO - Example - In.txt");
  24.  
  25. 	// If we couldn't open the file, exit
  26. 	if(!fin.good())
  27. 		return 1;
  28.  
  29. 	// The actual data begins after a colon character, so ignore all data
  30. 	// until after the colon.
  31. 	fin.ignore(1000,':');
  32.  
  33. 	// Loop three times, inputting the strings from the file
  34. 	for(int i = 0; i < 3; i++)
  35. 		fin >> strings[i];
  36.  
  37. 	// Ignore the data until another colon
  38. 	fin.ignore(1000,':');
  39.  
  40. 	// Input the number of ints to input, and loop that many times. Note
  41. 	// that if this is greater than five, this will try to go off the end
  42. 	// of the array and create an error.
  43. 	fin >> numInts;
  44. 	for(int i = 0; i < numInts; i++)
  45. 		fin >> ints[i];
  46.  
  47. 	// Ignore the data until another colon
  48. 	fin.ignore(1000,':');
  49.  
  50. 	// Input characters until the file says it cannot input any more data.
  51. 	// Again, if this happens more than five times you will get an error,
  52. 	// as 5 is the size of the chars array.
  53. 	for(numChars = 0; fin.good(); numChars++)
  54. 		fin >> chars[numChars];
  55.  
  56. 	// Decrement numChars, as it will have incremented one too many times.
  57. 	// When fin.good() returns false, numChars will have already been incremented.
  58. 	numChars--;
  59.  
  60. 	// Close the input file, as we are done with it
  61. 	fin.close();
  62.  
  63.  
  64. 	// Output the data to the console so we can see the input worked 
  65. 	// correctly
  66. 	for(int i = 0; i < 3; i++)
  67. 		cout << strings[i] << " ";
  68. 	cout << endl;
  69. 	for(int i = 0; i < numInts; i++)
  70. 		cout << ints[i] << " ";
  71. 	cout << endl;
  72. 	for(int i = 0; i < numChars; i++)
  73. 		cout << chars[i] << " ";
  74. 	cout << endl;
  75.  
  76.  
  77. 	// Open the output file - note this will create the file it it does not
  78. 	// already exist. If it already exists, it will overwrite it.
  79. 	fout.open("File IO - Example - Out.txt");
  80.  
  81. 	// Output the same results to the file.
  82. 	// The process is exactly the same, except using "fout" instead of "cout."
  83. 	for(int i = 0; i < 3; i++)
  84. 		fout << strings[i] << " ";
  85. 	fout << endl;
  86. 	for(int i = 0; i < numInts; i++)
  87. 		fout << ints[i] << " ";
  88. 	fout << endl;
  89. 	for(int i = 0; i < numChars; i++)
  90. 		fout << chars[i] << " ";
  91. 	fout << endl;
  92.  
  93. 	// Close the output file, as we are done with it.
  94. 	fout.close();
  95.  
  96. 	cout << endl;
  97. 	system("pause");
  98.  
  99. 	return 0;
  100. }
  101.  
Success #stdin #stdout #stderr 0s 3464KB
comments (?)
stdin 
Standard input is empty
stdout 
     
0 0 0 0 0
stderr 
sh: 1: pause: not found
https://ideone.com/cJfL1n
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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