Thread: Homework problem...structures or arrays?

Hi. I'm new here. Im a senior in high school, and I skipped Computer Programming I, and went straight to Programming II. The problem is, I had never programmed in my life until yesterday - So I'm still getting the hang of things. I've got a problem for homework, but I dont know how I'd go about doing it. Suggestions and Ideas - please.

8. Three employees in a company are up for a special pay increase. You are given a file, Ch3_Ex8Data.txt, with the following data

Miller Andrew 65789.87 5
Green Sheila 75892.56 6
Sethi Amit 74900.50 6.1

Each input line consists of the employee's last name, first name, current salary, and precent pay increase. Write a program that reads data from the specified file and stores the output in the file Ch3_Ex8Output.dat. For each employee the days must be output in the following form: firstName, lastName, updatedSalary. Format the ouput of the decimal numbers to two decimal places.


I know how to input the file, and all the main basics of C++, but I dont understand how I can the program to like....loop for each person in the file? Maybe I'm not supposed to do that?


Any advice/help is appreciated.

I've really got no idea what everyone else in my class has been taught. My teacher said this should be an easy program to refresh everyones memory about reading and writing from an external file. I've been looking stuff up for over 2 hours trying to find out how to do it. I just need some guidance on what to do/use.

I'd suggest either dropping the class and starting with programming 1, or talk to the teacher and get a week or so extension and get a few books ("Teach Yourself C++ in 21 Days" is excellent to learn quickly) to get a grasp on things.

Ah, I've got it figured out now. Problem is I was sitting here without a book. The teacher is cool, and she'll let me catch up, so it wont be a problem. The reason I didnt take Comp Programming 1 is because its mainly VB - they only touch only c++ basics at the end - and I have no interest in learning VB.

Ideas why this doesnt work?

Code:

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

bool getEmp(ifstream& empFile, string& lastName, string& firstName,
             double& salary, double& raise);
             
void writeEmp(ofstream& newFile, string& firstName, string&lastName, 
               double& updatedSalary);

void calcSalary(double salary, double raise, double updatedSalary);

using namespace std;

int main()
 {  
    cout << "Beginning employee salary updation.\n";            
    ifstream empFile ("Ch3_Ex8Data.txt");
    if (!empFile) {
    cerr << "The system was unable to open the file."; //error if file is in use.
    exit(100);  //if it is, terminate.
    }
    ofstream newFile ("Ch3_Ex8Output.dat")
    if (!newFile) {
    cerr << "They system was unable to open the file.";
    exit (102);
    }
    
 string firstName, lastName;
 double salary, raise, updatedSalary;
 
 while (getEmp  (empFile, lastName, firstName, salary, raise))
 {
       calcSalary (salary, raise, updatedSalary);
       writeEmp (newFile,  firstName, lastName, updatedSalary);
       } //end of while
       
 empfile.close();
 newfile.close();
 cout << "End of salary updation.\n";
return 0;

} //end of main


bool getEmp(ifstream&  empFile, string& lastName, string& firstName,
             double& salary, double& raise)
{           
            empFile >> lastName >> firstName >> salary >> raise;
            if (!empFile)
               return false;
            return true; 
} //end getEmp

void calcSalary(double salary, double raise, double updatedSalary)
{
     updatedSalary = (((raise*.01)+1)*salary)
     
     return;
} //end calcSalary

void writeEmp(ofstream& newFile, string& firstName, string&lastName, 
               double& updatedSalary)
{
               newfile << firstName;
               newfile.fill << (' ');
               newfile << lastName;
               newfile.fill (' ');
               newfile << updatedSalary;
               return;
} //end writeEmp

I'm getting errors such as

'ifstream' was not declared in this scope.


that along with all the rest of my variables and ofstream.



I pretty much suck at programming I guess.