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Код

    private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {
                    int n=textBox1->TextLength;
                    int len;
                    Pen^ pen;
                    switch(cl++)
                    {
                        case 0:cr = Color::Black; break;
                        case 1: cr = Color::DarkGray;    break;
                        case 2: cr = Color::Blue;    break;
                        case 3: cr = Color::Brown;    break;
                        case 4: cr = Color::Red;    break;
                        case 5: cr = Color::Green;    break;
                        case 6: cr = Color::Pink;    break;
                        default: 
                            {
                                cl=0;
                                cr = Color::Black;
                            }
                    }
                    pen = gcnew Pen(cr, 1);

                    char* str = new char[n];
                    char* str1 = new char[2*n];
                    for(int i=0; i<n; i++)
                        str[i]=Convert::ToChar(textBox1->Text[i]);

                    if(check(str,n))
                    {
                    translate_str(str,str1,n,len);
                    for(double i=-10;i<10;i+=0.001)
                      try{
                          pictureBox1->CreateGraphics()->DrawRectangle(pen,30*i+290,-30*solution(str1,len,i)+200,1,1);
                      }
                      catch(...){
                          if(i==0.0) 
                            { //деление на ноль
                                i+=0.001;
                                 pictureBox1->CreateGraphics()->DrawRectangle(pen,30*i+290,-30*solution(str1,len,i)+200,1,1);
                            }
                            else if(i<0) {//обработка отрицательных чисел для корня
                                i=0.00000001;
                             pictureBox1->CreateGraphics()->DrawRectangle(pen,30*i+290,-30*solution(str1,len,i)+200,1,1);
                            }
                     }
                    }else
                        MessageBox::Show("Ошибка","Некоректно заанна выражение",MessageBoxButtons::OK);
                  
             }