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  1. // Attached: Lab_6 Program #1
  2. // ===========================================================
  3. // File: Lab6_Program1.cpp
  4. // ===========================================================
  5. // Programmer: Elaine Torrez
  6. // Class: CS 1A
  7. // ===========================================================
  8.  
  9. #include <iostream>
  10. #include <fstream>
  11. #include <iomanip>
  12.  
  13. using namespace std;
  14.  
  15.  
  16. // ==== main ===================================================
  17. // This program writes one number to a text file twice.
  18. // The first output writes the number normally.
  19. // The second output formats the number to two decimal places.
  20. //
  21. // Input:
  22. // No user input.
  23. //
  24. // Output:
  25. // The number is written to the file values.txt twice,
  26. // once unformatted and once formatted to two decimal places.
  27. // ===========================================================
  28.  
  29. int main()
  30. {
  31.     fstream dataFile;
  32.     double number = 17.816392;
  33.  
  34.     // open the file for output
  35.     dataFile.open("values.txt");
  36.  
  37.     // format for fixed-point notation
  38.     dataFile << fixed;
  39.  
  40.     // write number without limiting decimal places
  41.     dataFile << number << endl;
  42.  
  43.     // format output to 2 decimal places
  44.     dataFile << setprecision(2);
  45.  
  46.     // write number again
  47.     dataFile << number << endl;
  48.  
  49.     cout << "Data has been written to file.\n";
  50.  
  51.     // close the file
  52.     dataFile.close();
  53.  
  54.     return 0;
  55.  
  56. } // end of main()
  57.  
  58. // ===========================================================
Success #stdin #stdout 0.01s 5308KB
comments (?)
stdin
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Standard input is empty
stdout
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Data has been written to file.
https://ideone.com/MqUCiQ
language:
C++ (gcc 8.3)
created:
10 hours ago
visibility:
public

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