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  1. // Attached: HW_6c
  2. // ===========================================================
  3. // File: HW_6c.cpp
  4. // ===========================================================
  5. // Programmer: Elaine Torrez
  6. // Class: CS 1A
  7. // ===========================================================
  8.  
  9. #include <iostream>
  10. #include <fstream>
  11.  
  12. using namespace std;
  13.  
  14.  
  15. // ==== main ===================================================
  16. // This program reads and displays the numbers in results.txt.
  17. // Then it prompts the user to enter 3 more numbers and appends
  18. // them to the same file.
  19. //
  20. // Input:
  21. // results.txt - A text file containing integer values.
  22. // 3 integers entered by the user.
  23. //
  24. // Output:
  25. // The current numbers in the file are displayed, and the new
  26. // numbers are appended to results.txt.
  27. // ===========================================================
  28.  
  29. int main()
  30. {
  31.     ifstream inFile;
  32.     ofstream outFile;
  33.     int count;
  34.     int number;
  35.     int userNumber;
  36.  
  37.     count = 0;
  38.  
  39.     // open the file for reading
  40.     inFile.open("results.txt");
  41.  
  42.     // check if the file opened successfully
  43.     if (!inFile)
  44.     {
  45.         cout << "Error opening file!" << endl;
  46.         return 0;
  47.     }
  48.  
  49.     cout << "Here are the numbers in the file:" << endl;
  50.  
  51.     // read and display the current numbers in the file
  52.     while (inFile >> number)
  53.     {
  54.         cout << number << endl;
  55.     }
  56.  
  57.     inFile.close();
  58.  
  59.     cout << endl;
  60.     cout << "Enter 3 more numbers:" << endl;
  61.  
  62.     // open the file in append mode
  63.     outFile.open("results.txt", ios::app);
  64.  
  65.     // get 3 more numbers from the user and append them
  66.     while (count < 3)
  67.     {
  68.         cin >> userNumber;
  69.         outFile << userNumber << endl;
  70.         count = count + 1;
  71.     }
  72.  
  73.     outFile.close();
  74.  
  75.     cout << "The numbers have been written (appended) to results.txt." << endl;
  76.     cout << endl;
  77.     cout << "Press any key to continue . . .";
  78.  
  79.     cin.ignore();
  80.     cin.get();
  81.  
  82.     return 0;
  83.  
  84. } // end of main()
  85.  
  86. // ===========================================================
Success #stdin #stdout 0.01s 5308KB
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Error opening file!
https://ideone.com/AxFrXZ
language:
C++ (gcc 8.3)
created:
11 hours ago
visibility:
public

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