A simple chart (Visual C++)

#pragma endregion

System::Boolean is_First(int value)

{

int i,sum=0;

for(i=1;i<value+1;i++)

if(value%i==0)

++sum;

if(sum==2)

return true;

else

return false;

}

private: System::Void button2_Click(System::Object^  sender, System::EventArgs^  e) {

Close();

}

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

Graphics^ gr=panel1->CreateGraphics();

Pen^ pn=gcnew Pen(System::Drawing::Color::Blue);

int height=panel1->Height;

int *tab;

int how_many=0;

int i,j;

int width=panel1->Width;

pn->Width=2;

int x0=0,y0=0,x1,y1=0;

for(i=0;i<width;i++)

{

                  if(is_First(i))

 {

++how_many;

 }

}

tab=new int[how_many];

i=0;

j=2;

do

{

if(is_First(j))

{

tab[i]=j;

++i;

}

++j;

}while(i<how_many);

for(i=0;i<how_many-1;i++)

{

                   gr->DrawLine(pn,tab[i],height,tab[i+1],height);

  height-=2;

}

delete tab;

label1->Text=panel1->Width.ToString();

label2->Text="0";

}

private: System::Void Form1_Load(System::Object^  sender, System::EventArgs^  e) {

}

};

}