Question

Working with Files in C++.

Create the following  program called payroll.cpp.  Note that the file you read must be created before you run this program.  The output file will be created automatically by the program.  You can save the input file in the same directory as your payroll.cpp file by using Add New Item, Text File.  

// File:  Payroll.cpp

// Purpose:  Read data from a file and write out a payroll

// Programmer:  (your name and section)

#include <cstdlib> // for the definition of EXIT_FAILURE

#include <fstream> // required for external file streams

#include <iostream> // required for cin cout

using namespace std;

int main ()

{

ifstream ins; // associates ins as an input stream

 ofstream outs; // associates outs as an output stream

 int id; // id for employee

 double hours, rate; // hours and rate worked

 double pay; // pay calculated

 double total_pay; // grand total of pay

 // Open input and output file, exit on any error

 ins.open ("em_in.txt"); // ins connects to file "em_in.txt"

 if (ins.fail ())

 {

   cout << "*** ERROR: Cannot open input file. " << endl;

   getchar(); //  hold the screen

   return EXIT_FAILURE;

 } // end if

 outs.open ("em_out.txt"); // outs connects to file "em_out.txt"

 if (outs.fail ())

 {

   cout << "*** ERROR: Cannot open output file." << endl;

   getchar();

   return EXIT_FAILURE;

 } // end if

// Set total_pay to 0

total_pay = 0;

ins >> id; // get first id from file

// Do the payroll while the id number is not the sentinel value

while (id != 0)

 {

   ins >> hours >> rate;

   pay = hours * rate;

   total_pay += pay;

   outs << "For  employee " << id << endl;

   outs << "The pay is " << pay << " for " << hours

<< " hours worked at " << rate << " rate of pay" << endl << endl;

   ins >> id;

 } // end while

 // Display a message on the screen

   cout << "Employee processing finished" << endl;

   cout << "Grand total paid out is " << total_pay << endl;

   ins.close(); // close input file stream

   outs.close(); // close output file stream

   return 0;

 }

Create the input file:

Inside C++ go to  File Add New Item and then Text to create a text file.  

Type in the data below

In the same directory as your .cpp file for Payroll.cpp click Files and Save As em_in.txt

1234

35  10.5

3456

40 20.5

0

solution should show :

-the output file  

-the input file

-the screen output

-the source program

Answer 1

Please find your answers below and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

source file, properly formatted:

// File:  Payroll.cpp
// Purpose:  Read data from a file and write out a payroll
// Programmer:  (your name and section)
#include <cstdlib> // for the definition of EXIT_FAILURE
#include <fstream> // required for external file streams
#include <iostream> // required for cin cout
using namespace std;
int main()
{
    ifstream ins; // associates ins as an input stream
    ofstream outs; // associates outs as an output stream
    int id; // id for employee
    double hours, rate; // hours and rate worked
    double pay; // pay calculated
    double total_pay; // grand total of pay
    // Open input and output file, exit on any error
    ins.open("em_in.txt"); // ins connects to file "em_in.txt"
    if (ins.fail()) {
        cout << "*** ERROR: Cannot open input file. " << endl;
        getchar(); //  hold the screen
        return EXIT_FAILURE;
    } // end if
    outs.open("em_out.txt"); // outs connects to file "em_out.txt"
    if (outs.fail()) {
        cout << "*** ERROR: Cannot open output file." << endl;
        getchar();
        return EXIT_FAILURE;
    } // end if
    // Set total_pay to 0
    total_pay = 0;
    ins >> id; // get first id from file
    // Do the payroll while the id number is not the sentinel value
    while (id != 0) {
        ins >> hours >> rate;
        pay = hours * rate;
        total_pay += pay;
        outs << "For  employee " << id << endl;
        outs << "The pay is " << pay << " for " << hours
             << " hours worked at " << rate << " rate of pay" << endl
             << endl;
        ins >> id;
    } // end while
    // Display a message on the screen
    cout << "Employee processing finished" << endl;
    cout << "Grand total paid out is " << total_pay << endl;
    ins.close(); // close input file stream
    outs.close(); // close output file stream
    return 0;
}

em_in.txt file (should be placed in the same directory as your cpp file)

1234
35  10.5
3456
40 20.5
0

em_out.txt file (generated after running the program)

For  employee 1234
The pay is 367.5 for 35 hours worked at 10.5 rate of pay

For  employee 3456
The pay is 820 for 40 hours worked at 20.5 rate of pay

console output generated after running the program

Employee processing finished
Grand total paid out is 1187.5

screenshots of everything