kvadrat

#pragma once
#include <stdlib.h>
#include <math.h>
#include "stdafx.h"
double kvad_ok( double a,double b,double c);
double x(double *x1, double *x2, double a, double b,double c);
double a,b,c,x1,x2;

namespace kvadrat {

    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;
            }
        }
    private: System::Windows::Forms::Label^  lbl_a;
    protected:
    private: System::Windows::Forms::Label^  lbl_b;
    private: System::Windows::Forms::Label^  lbl_c;
    private: System::Windows::Forms::Label^  lbl_res;
    private: System::Windows::Forms::TextBox^  edt_a;
    private: System::Windows::Forms::TextBox^  edt_b;
    private: System::Windows::Forms::TextBox^  edt_c;
    private: System::Windows::Forms::Button^  btn_res;
    private: System::Windows::Forms::Button^  btn_exit;

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

#pragma region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        void InitializeComponent(void)
        {
            this->lbl_a = (gcnew System::Windows::Forms::Label());
            this->lbl_b = (gcnew System::Windows::Forms::Label());
            this->lbl_c = (gcnew System::Windows::Forms::Label());
            this->lbl_res = (gcnew System::Windows::Forms::Label());
            this->edt_a = (gcnew System::Windows::Forms::TextBox());
            this->edt_b = (gcnew System::Windows::Forms::TextBox());
            this->edt_c = (gcnew System::Windows::Forms::TextBox());
            this->btn_res = (gcnew System::Windows::Forms::Button());
            this->btn_exit = (gcnew System::Windows::Forms::Button());
            this->SuspendLayout();
            //
            // lbl_a
            //
            this->lbl_a->AutoSize = true;
            this->lbl_a->Location = System::Drawing::Point(16, 33);
            this->lbl_a->Name = L"lbl_a";
            this->lbl_a->Size = System::Drawing::Size(13, 13);
            this->lbl_a->TabIndex = 0;
            this->lbl_a->Text = L"a";
            //
            // lbl_b
            //
            this->lbl_b->AutoSize = true;
            this->lbl_b->Location = System::Drawing::Point(16, 73);
            this->lbl_b->Name = L"lbl_b";
            this->lbl_b->Size = System::Drawing::Size(13, 13);
            this->lbl_b->TabIndex = 1;
            this->lbl_b->Text = L"b";
            //
            // lbl_c
            //
            this->lbl_c->AutoSize = true;
            this->lbl_c->Location = System::Drawing::Point(16, 114);
            this->lbl_c->Name = L"lbl_c";
            this->lbl_c->Size = System::Drawing::Size(13, 13);
            this->lbl_c->TabIndex = 2;
            this->lbl_c->Text = L"c";
            //
            // lbl_res
            //
            this->lbl_res->AutoSize = true;
            this->lbl_res->Location = System::Drawing::Point(16, 174);
            this->lbl_res->Name = L"lbl_res";
            this->lbl_res->Size = System::Drawing::Size(59, 13);
            this->lbl_res->TabIndex = 3;
            this->lbl_res->Text = L"Результат";
            //
            // edt_a
            //
            this->edt_a->Location = System::Drawing::Point(180, 33);
            this->edt_a->Name = L"edt_a";
            this->edt_a->Size = System::Drawing::Size(100, 20);
            this->edt_a->TabIndex = 4;
            //
            // edt_b
            //
            this->edt_b->Location = System::Drawing::Point(180, 73);
            this->edt_b->Name = L"edt_b";
            this->edt_b->Size = System::Drawing::Size(100, 20);
            this->edt_b->TabIndex = 5;
            //
            // edt_c
            //
            this->edt_c->Location = System::Drawing::Point(180, 114);
            this->edt_c->Name = L"edt_c";
            this->edt_c->Size = System::Drawing::Size(100, 20);
            this->edt_c->TabIndex = 6;
            //
            // btn_res
            //
            this->btn_res->Location = System::Drawing::Point(180, 174);
            this->btn_res->Name = L"btn_res";
            this->btn_res->Size = System::Drawing::Size(75, 23);
            this->btn_res->TabIndex = 7;
            this->btn_res->Text = L"Решить";
            this->btn_res->UseVisualStyleBackColor = true;
            this->btn_res->Click += gcnew System::EventHandler(this, &Form1::btn_res_Click);
            //
            // btn_exit
            //
            this->btn_exit->Location = System::Drawing::Point(98, 221);
            this->btn_exit->Name = L"btn_exit";
            this->btn_exit->Size = System::Drawing::Size(75, 23);
            this->btn_exit->TabIndex = 8;
            this->btn_exit->Text = L"Выход";
            this->btn_exit->UseVisualStyleBackColor = true;
            this->btn_exit->Click += gcnew System::EventHandler(this, &Form1::btn_exit_Click);
            //
            // Form1
            //
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(292, 271);
            this->Controls->Add(this->btn_exit);
            this->Controls->Add(this->btn_res);
            this->Controls->Add(this->edt_c);
            this->Controls->Add(this->edt_b);
            this->Controls->Add(this->edt_a);
            this->Controls->Add(this->lbl_res);
            this->Controls->Add(this->lbl_c);
            this->Controls->Add(this->lbl_b);
            this->Controls->Add(this->lbl_a);
            this->Name = L"Form1";
            this->Text = L"Form1";
            this->Load += gcnew System::EventHandler(this, &Form1::Form1_Load);
            this->ResumeLayout(false);
            this->PerformLayout();

        }
#pragma endregion
    private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {
             }

private: System::Void btn_res_Click(System::Object^  sender, System::EventArgs^  e)
         {

             //double a,b,c;
             a = Convert::ToDouble(edt_a->Text);
             if (a<0) lbl_res->Text = "Квадратного уравнения не существует" ;
             else
             {
                 b = Convert::ToDouble(edt_b->Text);
                 c = Convert::ToDouble(edt_c->Text);
                 double D = kvad_ok(a, b, c);

                 if (D == -1.0) lbl_res->Text = "Корней нет";
                 else if (D == 0.0)
                 {
                     lbl_res->Text = "x = " + x1;
                 }
                 else if (D > 0)
                     lbl_res->Text = "x1 = " + x1 + ", x2 = " + x2;
             }

             /*  b = Convert::ToDouble(edt_b->Text);
              c = Convert::ToDouble(edt_c->Text);
             lbl_res->Text = "x1=  " + Convert::ToString(kvad_ok(a, b, c)) + Convert::ToString(x(a, b, c,x1,x2,d))
               */


            /*::System::Windows::Forms::DialogResult rc =MessageBox::Show("Нажмите на кнопку Да или нет.", "Да/Нет", MessageBoxButtons::YesNo, MessageBoxIcon::Question);
            if (rc== ::System::Windows::Forms:: DialogResult:: No)
                MessageBox::Show("Нажали Нет");
            else
                MessageBox::Show("Нажали Да");*/

         }

private: System::Void btn_exit_Click(System::Object^  sender, System::EventArgs^  e)
         {
         Close();
         }
};
}

    double kvad_ok(double a, double b, double c)
        {
            double d = 0.0;
            d = b*b -4*a*c;
                if(d<0)
                    return -1.0;
                else if(d==0)
                {
                    x1 = -b/2*a;
                    x2 = 0.0;
                    return 0.0;
                }
                else if(d>0)
                {
                    x1=( -b - sqrt(d)/2*a);
                    x2=( -b+ sqrt(d)/2*a);
                    return d;
                }
    }