Thread: Keeps getting error

everything runs perfect but in my purchase() I can cin what i need but I keep getting an error and the same goes for my sell() everything else runs fine until i quit the program by command

Code:

#include <iostream.h>
#include <stdlib.h>

int coke = 0, pepsi = 0, dry = 0, hires = 0, brand, squantity, x, y, quantity, totalcoke, totalpepsi, totaldry, totalhires, soldcoke, soldpepsi, solddry, soldhires, pcoke = 0, ppepsi = 0, pdry = 0, phires = 0, addcoke ,addpepsi, adddry, addhires, coke_add, pepsi_add, dry_add, hires_add;

void initialize();
void instructions();
void sale_type(char option);
void inventory(), purchased(),sell(), display_inventory(), quit();

void main()
{
     initialize();
     instructions();//call instructions function, say goodbye to main forever
}//end function

void initialize()
{
cout << "\n\n Please enter the amount of Coke cases: ";
cin.clear();
cin >> coke_add;
coke = coke_add;

cout << " Please enter the amount of Pepsi cases: ";
cin.clear();
cin >> pepsi_add;
pepsi = pepsi_add;

cout << " Please enter the amount of Canada Dry cases: ";
cin.clear();
cin >> dry_add;
dry = dry_add;

cout << " Please enter the amount of Hires cases: ";
cin.clear();
cin >> hires_add;
hires = hires_add;
}

void instructions()
{
     char option;//declare option variable, this will be used OVER AND OVER
     do
     {
          cout << "\n\nWhat would you like to do?\n";
          cout << " (E)nter Inventory\n";
          cout << " (P)urchase Soda\n";
          cout << " (S)old Soda\n";
          cout << " (D)isplay Inventory\n";
          cout << " (Q)uit\n";//print us some options
               cin  >> option;
               cin.ignore(80,'\n'); //take in an answer
          sale_type(option);//send that answer to sale_type!
     }while(option!='Q' && option!='q');//keep on keepin on till they pick exit!
     //end program
}//end function

void sale_type(char option)
{
     switch (option)//roll thru options
     {
          case 'E': case 'e':  //if they picked the number 1, its gonna go to this function,
                         //thats pretty much how the whole thing works
               inventory();
               break;
          case 'P': case 'p':
               purchased();
               break;
          case 'S': case 's':
               sell();
               break;
          case 'D': case 'd':
               display_inventory();
               break;
          case 'Q': case 'q':
               quit();
               break;
           default://THEY DIDNT READ THE MENU, WHO WOULD HAVE THOUGHT?!?!
               cout << "Please read and follow all directions\n";//if directions aren't followed
               break;
     }
}//end function

void inventory()
{
cout << "\n\n\n-------------------INVENTORY----------------" << endl;
cout << "\n\nPlease enter the inventory for each item "<< endl;
cout << "\nEnter the number of Coca-Cola cases: ";
cin >> addcoke;

while (cin.fail())
  {
cin.clear();
        cin.ignore(cin.fail());
        cout << "Invalid input...please re-enter"<< endl;
        cout << "\nEnter the number of Coca-Cola cases: ";
              cin >> addcoke;
   }
totalcoke = coke + addcoke;

cout << "\nEnter the number of Pepsi cases: ";
cin >> addpepsi;

while (cin.fail())
  {
        cin.clear();
        cin.ignore();
        cout << "Invalid input...please re-enter" << endl;
        cout << "\nEnter the number of Pepsi cases: " << endl;
        cin >> addpepsi;
    }
totalpepsi = pepsi + addpepsi;

cout << "\nEnter the number of Canada Dry cases: ";
cin >> adddry;

while (cin.fail())
   {
cin.clear();
        cin.ignore();
cout << "Invalid input...please re-enter" << endl;
        cout << "\nEnter the number of Canada Dry cases: " << endl;
        cin >> adddry;
   }
totaldry = dry + adddry;

cout << "\nEnter the number of Hires cases: ";
cin >> addhires;

while (cin.fail())
   {
        cin.clear();
        cin.ignore();
        cout << "Invalid input...please re-enter" << endl;
        cout << "\nEnter the number of Hires cases: " << endl;
        cin >> addhires;
   }
totalhires = hires + addhires;
//clearline();
}//end function

void purchased()
{
cout << "\n\n\n-------------Purchase Menu------------------" << endl;
cout << "\nBrand Identification numbers are as follow: " << endl;
cout << "1---Coca-Cola" << endl;
cout << "2---Pepsi" << endl;
cout << "3---Canada Dry" << endl;
cout << "4---Hires" << endl;
cout << "\nPlease enter the brand you would like to purchase: ";
cin >> x;
cout << "\nPlease enter the quantity of the brand you would like to purchase: ";
cin >> quantity;


while(x >= 1 && x <= 4)
  {
switch(x)
   {
case 1:
pcoke = quantity;
totalcoke = totalcoke + quantity;
cout << "Inventory updated..." << endl;
break;

case 2:
ppepsi = quantity;
totalpepsi = totalpepsi + quantity;
cout << "Inventory updated..." << endl;
break;

case 3:
pdry = quantity;
totaldry = totaldry + quantity;
cout << "Inventory updated..." << endl;
break;

case 4:
phires = quantity;
totalhires = totalhires + quantity;
cout << "Inventory updated..." << endl;
break;

default:
cout << "bbThe action you requested is invalid...nothing has been done..." << endl;
  }
 }
}//end function

void sell()
{
cout << "\n\n\n------------------Sell Menu-------------------------------" << endl;
cout << "\nPlease enter the brand id number you would like to sell: ";
cin >> y;
cout << "\nPlease enter the quantity of the brand you would like to sell: ";
cin >> quantity;

while (y >= 1 && y <= 4)
 {
switch(y)
 {
case 1:
soldcoke = squantity;
totalcoke = totalcoke - squantity;
while (!cin.fail() && quantity > 0)
  {
      if(squantity > coke)
        {
cout << "Insufficient inventory to fill sell order, nothing changed." << endl;
         }
   }
        
cout << "Inventory updated...";
        break;

case 2:
soldpepsi = squantity;
totalpepsi = totalpepsi - squantity;
cin >> squantity;
while (!cin.fail() && squantity > 0)
 {
        if(squantity > pepsi)
         {
cout << "Insufficient inventory to fill sell order, nothing changed." << endl;
          }
  }

         cout << "Inventory updated...";
         break;

case 3:
solddry = squantity;
totaldry = totaldry - squantity;
while (!cin.fail() && squantity > 0)
   {
       if(squantity > dry)
        {
cout << "Insufficient inventory to fill sell order, nothing changed." << endl;
            }
   }
          cout << "Inventory updated...";
          break;

case 4:
soldhires = squantity;
totalhires = totalhires - squantity;
while (!cin.fail() && squantity > 0)
   {
       if(squantity > hires)
        {
cout << "Insufficient inventory to fill sell order, nothing changed." << endl;
        }
    }
           cout << "Inventory updated...";
           break;
	
default:
cout  << "ccThe action you requested is invalid...nothing has been done" << endl;
    }
  }
}//end function

void display_inventory()
{
cout << "              Present inventory"<< endl;
cout << "    BRAND    ID  CASES TOTAL PURCHASED SOLD  " << endl;
cout << "      Coke-- 1 -- " << coke << "\t" << totalcoke << "\t" << pcoke << "\t-" << soldcoke << endl;
cout << "     Pepsi-- 2 -- " << pepsi << "\t" << totalpepsi << "\t" << ppepsi << "\t-" << soldpepsi << endl;
cout << "Canada Dry-- 3 -- " << dry << "\t" << totaldry << "\t" << pdry << "\t-" << solddry << endl;
cout << "     Hires-- 4 -- " << hires << "\t" << totalhires << "\t" << phires << "\t-" << soldhires << endl;
}//end function

void quit()
{
cout << "\nPlease have a nice day!!!" << endl;
}//end function

Code:

#include <iostream>     // drop the .h
#include <cstdlib>        // drop the .h 
using namespace std;   // This is because we dropped the .h

...

int main()      // main always always always returns an int.