/*_________________________________________________________________________
                              U S I N G   S W I T C H    S T A T E M E N T S

                                       Created 1/23/2014 for C++ 2012
                                                     Ron Kessler
___________________________________________________________________________


Updated 1/24/2014

1/24/2014   Added a combo box to display the states instead of using a textbox

This program demonstrates how to use the switch structure. They choose a State & we
compute the sales tax rate.

C++ will not let you use strings in switch. It will let you evaluate a char, int and other value types. But since I want to
evaluate states (CA, AZ, etc.) I put them into a combo box and switch on the selected index. Remember, combo/list boxes
start indexing from zero.

Also shows how to use the Accept and Cancel buttons

*/

#pragma once

namespace My3UsingSwitch {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Summary for Form1
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	internal: System::Windows::Forms::Button^  btnQuit;
	protected: 
	internal: System::Windows::Forms::Button^  btnOK;
	internal: System::Windows::Forms::Label^  Label5;


	internal: System::Windows::Forms::Label^  Label3;
	internal: System::Windows::Forms::TextBox^  txtCity;
	internal: System::Windows::Forms::Label^  Label2;
	internal: System::Windows::Forms::TextBox^  txtName;
	internal: System::Windows::Forms::Label^  Label1;
	private: System::Windows::Forms::ComboBox^  cboStates;
	internal: 

	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;



        //***********START OF MY CODE************

       
		  static double salesTaxRate = 0;       //class level variable


		private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) 
				 
			{
                //---fill the combo box
                cboStates->Items->Add("CA");
                cboStates->Items->Add("AZ");
                cboStates->Items->Add("NV");
                cboStates->Items->Add("OR");
                cboStates->Items->Add("WA");

                cboStates->SelectedIndex =0;        // make sure the first one is selected
		    }




	    private: System::Void btnOK_Click(System::Object^  sender, System::EventArgs^  e) 
			 {
			        //---now decide the sales tax rate based upon the state they chose
					
                    MessageBox::Show("The sales tax for " + cboStates->SelectedItem->ToString() + " is " +  salesTaxRate + ".", "Using Switch" ,
						MessageBoxButtons::OK, MessageBoxIcon::Information);
			 
			 }

        private: System::Void cboStates_SelectedIndexChanged(System::Object^  sender, System::EventArgs^  e) 
		 
		 {
		 
		          /*  ---now decide the sales tax rate based upon the state they chose. C++ will not let you evaluate a string using switch like you can in VB & C#.
                    That is why it is easier to use a combo box and switch on the index number.
                  */
                    
                    switch (cboStates->SelectedIndex)
                    {
                        case 0:                             //CA
                            salesTaxRate = .08;
                            break;
                
                        case 1:                             //AZ
                            salesTaxRate = .05;
                            break;
                        case 2:                             //NV
                            salesTaxRate = .01;
                            break;

                        case 3:                             //OR and WA are the same. If they choose OR, the switch "falls through" to case 4. Both OR and WA will have the same sales tax
						case 4:                             //WA
                            salesTaxRate = .06;
                            break;

                        
                  
                    }
		 
		 }
        private: System::Void btnQuit_Click(System::Object^  sender, System::EventArgs^  e) 
		 
		 {
             this->Close();
		 }
};
}