expected primary-expression before "float"

I am getting the following errors in line 101 and 103: expected primary-expression before "float". I am unsure as to what this means.. Any help would be appreciated! :)

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#include <iostream>
#include <fstream>
#include <cstdlib>
#include <iomanip>
using namespace std;

//This function displays a brief overview explaining the program to the user
void programOverview()
{
  cout << "This program will read input from an external file" << endl;
  cout << "and calculate the total amount of money for books sales" << endl;
  cout << "at an online store." << endl;
}

//This function attempts to open the file/report error
void openFile ()
{
  ifstream fp;
  fp.open ("books.dat");
  if (!fp)
    cout << "Error opening the file" << endl;
    exit (EXIT_FAILURE);
}

//This function will obtain all input for each sale from the data file and return merchandise total and shipping method for the sale being processed

void obtainInput()
{
      ifstream fp;
      int i=0;
      int books;
      char shipping_method;
      float price;
      float subtotal;
      float shipping_price;

      if (fp >> books >> shipping_method)
        {
          for (int i=0; i < books; i++)
            {
              if (fp >> price)
                {
                  subtotal += price;
                }
            }
        }

  if (shipping_method == 'S')
      shipping_price = 4.99;
  else
      shipping_price = 12.99;
}

//Calculate tax, discount, shipping and total

void calculateOutput(float subtotal, float shipping_price)
{
  float tax;
  tax = subtotal * .05;
  float discount;
  if (subtotal < 50)
    discount = 0.00;
  else if (subtotal >= 50 && subtotal <= 100)
      discount = subtotal * .10;
  else
      discount = subtotal * .15;

  float total;
  total = subtotal + tax - discount + shipping_price;
}

//Display a final summary
void displaySummary(float tax, float subtotal, float discount, float shipping_price, float total)
{
  cout << "The summary for the order is as follows:" << endl;
  cout << fixed << showpoint << setprecision (2);
  cout << "Subtotal:" << subtotal << endl;
  cout << fixed << showpoint << setprecision (2);
  cout << "Tax:" << tax << endl;
  cout << fixed << showpoint << setprecision (2);
  cout << "Discount:" << discount << endl;
  cout << fixed << showpoint << setprecision (2);
  cout << "Shipping:" << shipping_price << endl;
  cout << fixed << showpoint << setprecision(2);
  cout << "Total:" << total << endl;
}

int main ()
{

  programOverview ();

  cout << "Book Sale Calculator" << endl;
  cout << "=======================" << endl;

  openFile();

  obtainInput();

  calculateOutput(float subtotal, float shipping_price);

  displaySummary(float tax, float subtotal, float discount, float shipping_price, float total);

return 0;
}

You're not using functions correctly, ref. http://www.cplusplus.com/doc/tutorial/functions/ and http://www.cplusplus.com/doc/tutorial/functions2/

the problems at lines 100 and 102 can be solved by a simple declaration of variables and calling the function e.g:
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//function declaration
void myFunction(int, float); 
int main()
{
     //declare variables to pass to teh function
     int intVar = 0;
     float floatVar = 1.1;
     myFunction(intVar, floatVar);
     ....
}
//function definition
void myFunction(int iv, float fv)
{
     //process iv and fv
}


...but I see some troubles ahead, so better do review of functions and re-read the tutorial links
I know. I have been having trouble understanding functions and parameters. I will re-read the links that you sent me. Thank you
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