[Dev-C++] while termination problems

    This maybe a newbie question, but consider this while statement.  =
The sentential (-1) should terminate at the beginning of the loop, which =
it doesn't.  What have I forgotten?=20



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



using namespace std;



int main(int argc, char *argv[])
{
  double acctnum;
  double bBal;
  double nBal;
  double charges;
  double limit;
  double credits;
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  while (acctnum !=3D -1){
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    cout << "Enter account number (enter -1 to end): ";
    cin >> acctnum;
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    cout << "Enter beginning balance: ";
    cin >> bBal;
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    cout << "Enter total charges: ";
    cin >> charges;
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    cout << "Enter total credits: ";
    cin >> credits;
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    cout << "Enter credit limit: ";
    cin >> limit;
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    nBal =3D bBal + charges - credits;
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    cout << "Account:" << setw(13) << acctnum << "\n";
    cout << "Credit Limit:" << setw(9) << limit << "\n";
    cout << "Balance:" << setw(14) << nBal << "\n";
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    if (nBal > limit)
        cout << "Credit Limit Exceeded.\n";
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}
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  system("PAUSE");=20
  return 0;
}