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c_cpp
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// MyForm.cpp
#include "MyForm.h"
using namespace System;
using namespace System::Windows::Forms;
[STAThread]
int main(array<String^>^ args) {
	Application::EnableVisualStyles();
	Application::SetCompatibleTextRenderingDefault(false);
	test2::MyForm form;
	Application::Run(% form);
}



//MyForm.h
#pragma once

// Функция для вычисления факториала
int Factorial(int n) {
	if (n == 0 || n == 1) {
		return 1;
	}
	else {
		return n * Factorial(n - 1);
	}
}

namespace test2 {

	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>
	/// Сводка для MyForm
	/// </summary>
	public ref class MyForm : public System::Windows::Forms::Form
	{
	public:
		MyForm(void)
		{
			InitializeComponent();
			//
			//TODO: добавьте код конструктора
			//
		}

	protected:
		/// <summary>
		/// Освободить все используемые ресурсы.
		/// </summary>
		~MyForm()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Button^ button1;
	private: System::Windows::Forms::NumericUpDown^ numericUpDown1;
	private: System::Windows::Forms::TextBox^ textBox1;
	private: System::Windows::Forms::Label^ label1;
	private: System::Windows::Forms::Label^ label2;
	protected:

	private:
		/// <summary>
		/// Обязательная переменная конструктора.
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Требуемый метод для поддержки конструктора — не изменяйте 
		/// содержимое этого метода с помощью редактора кода.
		/// </summary>
		void InitializeComponent(void)
		{
			this->button1 = (gcnew System::Windows::Forms::Button());
			this->numericUpDown1 = (gcnew System::Windows::Forms::NumericUpDown());
			this->textBox1 = (gcnew System::Windows::Forms::TextBox());
			this->label1 = (gcnew System::Windows::Forms::Label());
			this->label2 = (gcnew System::Windows::Forms::Label());
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^>(this->numericUpDown1))->BeginInit();
			this->SuspendLayout();
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(23, 184);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(230, 55);
			this->button1->TabIndex = 0;
			this->button1->Text = L"button1";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &MyForm::button1_Click);
			// 
			// numericUpDown1
			// 
			this->numericUpDown1->Location = System::Drawing::Point(23, 144);
			this->numericUpDown1->Name = L"numericUpDown1";
			this->numericUpDown1->Size = System::Drawing::Size(230, 20);
			this->numericUpDown1->TabIndex = 1;
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(27, 45);
			this->textBox1->Name = L"textBox1";
			this->textBox1->Size = System::Drawing::Size(225, 20);
			this->textBox1->TabIndex = 2;
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(129, 128);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(15, 13);
			this->label1->TabIndex = 3;
			this->label1->Text = L"N";
			// 
			// label2
			// 
			this->label2->AutoSize = true;
			this->label2->Location = System::Drawing::Point(76, 29);
			this->label2->Name = L"label2";
			this->label2->Size = System::Drawing::Size(128, 13);
			this->label2->TabIndex = 4;
			this->label2->Text = L" ЧИСЛО - ФАКТОРИАЛ";
			// 
			// MyForm
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(284, 261);
			this->Controls->Add(this->label2);
			this->Controls->Add(this->label1);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->numericUpDown1);
			this->Controls->Add(this->button1);
			this->Name = L"MyForm";
			this->Text = L"MyForm";
			(cli::safe_cast<System::ComponentModel::ISupportInitialize^>(this->numericUpDown1))->EndInit();
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
	private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
		int n = Decimal::ToInt32(numericUpDown1->Value);
		int result = Factorial(n);
		textBox1->Text = "Факториал " + n.ToString() + " = " + result.ToString();
	}
};
}
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