Thread: 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;
      
      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!