variable initialization fail

[TwistingPlanets]

//Calculate balance due based on software sales.
//A software company sells a package that retails for $99. Quantity discounts are as follows:
//10-19: 20%, 20-49: 30%, 50-99: 40%, 100 or more: 50%.
//Write a program that asks for the number of units purchased and computes the total cost of the purchase.
//Include a flag.
#include <iostream>
#include <iomanip>
using namespace std;

int main ()
{
int numSold;
double pPrice, //purchase price per unit
totalDue;
const short PRICE = 99;
bool flag = false;

cout << "How many units sold? ";
cin >> numSold;
if (numSold <= 0)
flag = true;
else if (numSold < 10)
pPrice = numSold * PRICE;
else if (numSold < 20)
pPrice = 0.8 * numSold * PRICE;
else if (numSold < 50)
pPrice = 0.7 * numSold * PRICE;
else if (numSold < 100)
pPrice = 0.6 * numSold * PRICE;
else //further if for 100 or greater not needed
pPrice = 0.5 * numSold * PRICE;

totalDue = numSold * pPrice;

if (flag)
{
cout << "Invalid entry, run the program again.\n";
return 0; //ends the program prematurely if flag is true
}

cout << fixed << setprecision(2);
cout << "\nUnits Sold:" << setw(49) << numSold <<endl;
cout << "Purchase Price per Unit:" << setw(26) << "$" << setw(10) << pPrice << endl;
cout << "Balance Due:" << setw(38) << "$" << setw (10) << totalDue << endl;
return 0;
}

This program worked fine when I input zero until I put in the flag. Don't know why it's giving me an error on pPrice. Entering zero now causes the program to crash.

Thanks.

[firedraco]

What is the message you are getting when it crashes?

[TwistingPlanets]

"Debug Error!

Program: ...studio
2010\Projects\Software_Sales\Debug\Software_Sales.exe
Module: ...studio
2010\Projects\Software_Sales\Debug\Software_Sales.exe
File:

Run-Time Check Failure #3 - The variable 'pPrice' is being used without being initialized.

(Please retry to debug the application)

[Abort] [Retry] [Ignore]"

[Dukaim]

Put

if (flag)
{
cout << "Invalid entry, run the program again.\n";
return 0; //ends the program prematurely if flag is true
}

before totalDue = numSold * pPrice;

[TwistingPlanets]

Thank you, this works! Can you explain why?
That I can see, the flag is not manipulating pPrice at all.
Would like to be able to not make the same mistake in the future :)