How to do this

Here is the code I have written so far. It's just an exercise but there is one thing I'm struggling with.

Code:

---

// Practise Exercise

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

int main()
{ 
  int acc_number;
  float Bbalance;
  float charges;
  float credits;
  float limit;
  float Ebalance;
 
  while ( acc_number != -1 )
  {
      // Get the info
      cout << "Enter account number (-1 to end): ";
      cin >> acc_number;
 
      cout << "Enter beginning balance: ";
      cin >> Bbalance;
 
      cout << "Enter total charges: ";
      cin >> charges;
 
      cout << "Enter total credits: ";
      cin >> credits;
 
      cout << "Enter credit limit: ";
      cin >> limit;
 
      // Calculation
      Ebalance = Bbalance + charges - credits;
 
      // if credit limit is exceeded display the following 
      if ( Ebalance > limit )
      {     
            cout << fixed << setprecision( 2 );
       
            cout << "Account:\t\t" << acc_number << '\n'
                << "Credit limit:\t\t" << limit << '\n'
                << "Balance:\t\t" << Ebalance << '\n'
                << "Credit Limit Exceeded.\n" << endl;
      }
      else
            cout << endl;
  } 
 
  cin.get();
  return 0;
}

---

Now if you'll turn your attention to the while loop you'll notice the condition. For the loop to break a person needs to input -1 into the int acc_number. The thing is, this is only tested at the start of the loop which means that if a user inputs -1 the rest of the loop will continue and will only break once it's reached the end and checks the condition. I've sat for a while trying to figure out how to work around this, but the exercise states I need to use a while loop. I need the loop to break the second -1 is entered by the user into acc_number. Any suggestions?

Code:

---

.......
while ( acc_number != -1 )
  {
      // Get the info
      cout << "Enter account number (-1 to end): ";
      cin >> acc_number;
      //you may be able to just put 'continue;' right here and take out the conditional statement.. I'm at the wrong computer, no compiler
      if (acc_number == -1)
        break;  //exits the loop
  .......

---

Try the 'continue;' and see if that works, it's not necisarally faster because continue checks the while loop's parameters but it looks beter, and it's easier to manage.

Code:

---

  while ( acc_number != -1 )
  {
      // Get the info
      cout << "Enter account number (-1 to end): ";
      cin >> acc_number;
     
      if ( acc_number == -1 )
        break;

---

I had thought of doing something like that, but then it makes the while's condition a bit pointless. Is this the way to do it or can anyone think of something better?

Code:

---

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

int main()
{ 
  int acc_number;
  float Bbalance;
  float charges;
  float credits;
  float limit;
  float Ebalance;
 
  // Get the info
  cout << "Enter account number (-1 to end): ";
  cin >> acc_number;

  while ( acc_number != -1 )
  {
      cout << "Enter beginning balance: ";
      cin >> Bbalance;
 
      cout << "Enter total charges: ";
      cin >> charges;
 
      cout << "Enter total credits: ";
      cin >> credits;
 
      cout << "Enter credit limit: ";
      cin >> limit;
 
      // Calculation
      Ebalance = Bbalance + charges - credits;
 
      // if credit limit is exceeded display the following 
      if ( Ebalance > limit )
      {     
            cout << fixed << setprecision( 2 );
       
            cout << "Account:\t\t" << acc_number << '\n'
                << "Credit limit:\t\t" << limit << '\n'
                << "Balance:\t\t" << Ebalance << '\n'
                << "Credit Limit Exceeded.\n" << endl;
      }
      else
            cout << endl;

      // Get the info
      cout << "Enter account number (-1 to end): ";
      cin >> acc_number;
 
  } 
 
  cin.get();
  return 0;
}

---

Sometimes I just wanna smack myself with something hard. Thanks so much Omnibus. I'm working through some exercises and it's late. Such a logical thing and I didn't think of it. At least I know now for the future! :D