Question

Lab 6    -   2 Programs   -   (Lec. 6)

Lab 6    -   Program #1   -   Write one number to a text file.

// This program writes one number two times to a text file. (see output below)

// The program uses the setprecision and fixed manipulators to format file output.

// The first output simply writes the number to file, without formatting decimal places.

// The second output formats the number to 2 places to the right of the decimal point.

Fill in the blanks   -   then enter the code and run the program and see if correct.

#include <iostream>

                                     (1.)   Include other libraries that may

                                                    be needed.

                                    

using namespace std;

int main()

{

   fstream dataFile;

   double number = 17.816392;

                                (2.)   Write one statement to open

                                                                                         in output mode.

                                                                                                           The file name is:   values.txt

                                (3.)   Format for fixed-point notation.

                                (4.)   Write number to the file.

                                (5.)   Format output to 2 decimal places.

                                     (6.)   Write number to the file.

   cout << "Data has been written to file.\n";

                                     (7.)   Close the file.

return 0;                         

}

(8.)   Open the text file to see the output.

Please fill in the blanks

Answer 1

C++ code for above problem

#include<iostream>
#include<fstream>
#include<iomanip>

using namespace std;

int main()
{
   fstream dataFile;
    double number = 17.816392;
  
    ofstream myfile;
    myfile.open("values.txt");
  
    myfile << number << endl;
  
    myfile << setprecision(4) << number << endl;
  
    cout << "Data has been written to file.\n";

   myfile.close();

   return 0;                       

}

Mention in comments if any mistakes or errors are found Thank you.