CD Publisher
 

In this exercise, we will develop an application for a small CD publishing company. The owner wants the prices to be calculated so a customer would get a discount if he orders more. To attract customers and encourage them to order more, she has decided to fix the prices so that the customer would pay:

  • $20/CD if he orders less than 20 units
  • $15/CD if he orders less than 50 units
  • $12/CD if he orders less than 100 units
  • $8/CD if he orders less than 500 units
  • $5/CD if he orders more than 500 units

 
  1. Start Visual Studio
  2. Create a new Visual C++ Windows Application and name it CDPublisher
  3. Design the form as follows:
     
    CD Publisher Design
    Control Name Text Other Properties
    Label   Number of CDs:  
    NumericUpDown updQuantity   Maximum: 10000
    TextAlign: Center
    Label   Unit Price:  
    TextBox txtUnitPrice 0 TextAlign: Right
    Label   Total Price:  
    TextBox txtTotalPrice 0 TextAlign: Right
    Button btnClose Close  
  4. Double-click the Close button and implement it as follows:
      
    private: System::Void button1_Click(System::Object *  sender, System::EventArgs *  e)
			 {
				 this->Close();
			 }
  5. Double-click the up down button to access its OnChange() event and implement it as follows:
      
    private: System::Void updQuantity_ValueChanged(System::Object *  sender, System::EventArgs *  e)
	{
		 int Quantity;
		 double UnitPrice, TotalPrice;

		 Quantity = System::Decimal::ToInt32(updQuantity->Value); //.ToInt32();

		 if( Quantity < 20 )
			 UnitPrice = 20;
		 else if( Quantity < 50 )
			 UnitPrice = 15;
		 else if( Quantity < 100 )
			 UnitPrice = 12;
		 else if( Quantity < 500 )
			 UnitPrice = 8;
		 else
			 UnitPrice = 5;

		 TotalPrice = Quantity * UnitPrice;

                                 txtUnitPrice->Text = UnitPrice.ToString("C");
		 txtTotalPrice->Text = TotalPrice.ToString("C");
}
  6. Test the application
  7. Close it
 
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