#pragma once

namespace Fakul {

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

	int fakul(int n)
	{
		if (n == 0)
			return 1;
		else
			return n * fakul(n - 1);
	}

	/// <summary>
	/// Zusammenfassung für Form1
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			InitializeComponent();
			//
			//TODO: Konstruktorcode hier hinzufügen.
			//
		}

	protected:
		/// <summary>
		/// Verwendete Ressourcen bereinigen.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::TextBox^  textBox1;
	protected: 
	private: System::Windows::Forms::Button^  button1;

	private:
		/// <summary>
		/// Erforderliche Designervariable.
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Erforderliche Methode für die Designerunterstützung.
		/// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert werden.
		/// </summary>
		void InitializeComponent(void)
		{
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->SuspendLayout();
			// 
			// textBox1
			// 
			this->textBox1->Anchor = System::Windows::Forms::AnchorStyles::None;
			this->textBox1->Location = System::Drawing::Point(113, 98);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(58, 20);
			this->textBox1->TabIndex = 3;
			// 
			// button1
			// 
			this->button1->Anchor = System::Windows::Forms::AnchorStyles::None;
			this->button1->AutoSize = true;
			this->button1->Location = System::Drawing::Point(88, 141);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(109, 23);
			this->button1->TabIndex = 2;
			this->button1->Text = L"Fakultät berechnen";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(284, 262);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->button1);
			this->Name = L"Form1";
			this->Text = L"Fakultätsberechnung";
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
				 int eingabezahl = 0;

				 if (textBox1->Text != "")
					 eingabezahl = Convert::ToInt32(textBox1->Text);

				 if (eingabezahl <= 12 && eingabezahl >= 0)					
					 MessageBox::Show(eingabezahl.ToString() + "! = " + fakul(eingabezahl).ToString());

				 else if (eingabezahl < 0)
					 MessageBox::Show("Geben Sie bitte eine positive Zahl ein");

				 else if (eingabezahl > 12)
					 MessageBox::Show("Die eingegebene Zahl ist zu groß");
			 }
	};
}

