Application Example: 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

Practical LearningPractical Learning: Creating the Application

  1. Start Visual Studio
  2. Create a new Windows Forms Application and name it CDPublisher1
  3. Design the form as follows:
    Control Name Text Other Properties
    Label   Number of CDs:  
    NumericUpDown updQuantity   Maximum: 10000
    TextAlign: Center
    Button btnClose Close  
    Label   Unit Price:  
    TextBox txtUnitPrice 0 TextAlign: Right
    Label   Total Price:  
    TextBox txtTotalPrice 0 TextAlign: Right
  4. Double-click the up down button to access its OnChange() event and implement it as follows:
    System::Void updQuantity_ValueChanged(System::Object^  sender, 
    		System::EventArgs^  e)
    	 int Quantity;
    	 double UnitPrice, TotalPrice;
    	 Quantity = System::Decimal::ToInt32(updQuantity->Value);
    	 if( Quantity < 20 )
    		 UnitPrice = 20;
    	 else if( Quantity < 50 )
    		 UnitPrice = 15;
    	 else if( Quantity < 100 )
    		 UnitPrice = 12;
    	 else if( Quantity < 500 )
    		 UnitPrice = 8;
    		 UnitPrice = 5;
    	 TotalPrice = Quantity * UnitPrice;
             txtUnitPrice->Text = UnitPrice.ToString("C");
    	 txtTotalPrice->Text = TotalPrice.ToString(L"C");
  5. Double-click the Close button and implement it as follows:
    System::Void btnClose_Click(System::Object^  sender, 
    		System::EventArgs^  e)
  6. Test the application
  7. Close it

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