Need of Assistance #3

I am writing a program that grabs information from a .dat file. I have the code all structured up, but I get these 2 errors that does not make any sense to me on how to fix the program. Am I missing something?

errors (2):

Code:

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Error        1        error LNK2019: unresolved external symbol "void __cdecl swap(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *)" (?swap@@YAXPAV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@0@Z) referenced in function "void __cdecl sort(int)" (?sort@@YAXH@Z)        C:\Users\Mom\Desktop\Drive\Quarter 2\C++\Projects\DynamicDeptPayroll\DynamicDeptPayroll\Source.obj        DynamicDeptPayroll
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Error        2        error LNK1120: 1 unresolved externals        C:\Users\Mom\Desktop\Drive\Quarter 2\C++\Projects\DynamicDeptPayroll\Debug\DynamicDeptPayroll.exe        DynamicDeptPayroll

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.dat file contents:

Code:

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Fogarty Bob 1 40 10.25
Smith John 2 38 8.72
Jones Mary 2 28 6.25
Arrmen William 1 15 8.22
Lavey Betty 1 32 15.00

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source contents:

Code:

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#include <iostream>
#include <string>
#include <fstream>
using namespace std;

//PROTOTYPES
void sort(int n);
void swap(string *p1, string *p2);
//GLOBAL VARIABLES
string *dept, *name, *grosspay;

int main(){
        string d, n, gp;
        int count = 0;
        double dept1, gpay, totalgpay = 0;
        string name1;
       
        //DECLARE FILE OBJECT
        ifstream fin("c:\\data\\dept.dat");

        while (!fin.eof()){
                fin >> d >> n >> gp;
                count++;
        }
        fin.close();
        //SIZE ARRAYS
        dept = new string[count];
        name = new string[count];
        grosspay = new string[count];

        //LOAD ARRAYS
        fin.open("c:\\data\\dept.dat");

        for (int i = 0; i < count; i++){
                fin >> dept[i] >> name[i] >> grosspay[i];
        }
        fin.close();

        //SORT CALL
        sort(count);

        for (int i = 0; i < count; i++){
               
                gpay = atof(grosspay[i].c_str());
                name1 = atof(name[i].c_str());
                totalgpay = gpay / 3;

                cout << dept[i] << "\t" << name[i] << "\t" << grosspay[i] << "\n";
                cout << "TOTAL GROSS: " << totalgpay;
        }
        delete[] dept;
        delete[] name;
        delete[] grosspay;

        system("pause");
        return 0;
}

void sort(int n){

        int i, j, low;
        for (i = 0; i < n - 1; i++){
                low = i;
                for (j = i + 1; j < n; j++)
                        if (dept[j] < dept[low])
                                low = j;

                if (i != low){
                        swap(&dept[i], &dept[low]);
                        swap(&name[i], &name[low]);
                        swap(&grosspay[i], &grosspay[low]);
                }
        }
}

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Code:

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swap(&dept[i], &dept[low]);
swap(&name[i], &name[low]);
swap(&grosspay[i], &grosspay[low]);

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Why are you using & to obtain an address?

When you get this program to compile, you will find that you also have issues re reading of the data and of calculating total gross. Using the debugger should help you find the problem re calulation.

With regard to the issue reading the data. When you find eof(), the file is put into a 'fail' state which means that no further data can be read until this state is cleared using the .clear() function. There is also no need to close and re-open the file. Just position the file to the beginning using .seekg() after clearing the error.

You are using .eof() to determine when the end of file has been reached. Another way of doing this is

Code:

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while (fin >> d >> n >> gp) count++;

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as extracting from a file causes a fail when data cannot be read which means that the extraction returns a 0 as opposed to a reference to the stream if the extraction worked ok.

Also note that the format of the data you are extracting from the file does not match the .dat file contents shown in post #1.

See http://www.cplusplus.com/reference/istream/istream/ for further details of the file stream functions.