u6_1_2.cpp

《C++ Builder 5程序设计——基础教学篇》程序源代码2.

//----------------  u6_1_2  -----------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include<math.h>
#include "u6_1_2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
Tf6_1_2 *f6_1_2;
//---------------------------------------------------------------------------
__fastcall Tf6_1_2::Tf6_1_2(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall Tf6_1_2::FormPaint(TObject *Sender)
{
  float x,y,total=0;
  int row=0;
  Canvas->Font->Size=10;
  Canvas->TextOut(40,10,"    x        y   ");
  Canvas->TextOut(20,25,"=================");
  for(x=-1 ; x<=1;x+=0.5)
  {
     y=3*pow(x,2)+2*x+1;
     Canvas->TextOut(50,50+row*20,x);
     Canvas->TextOut(100,50+row*20,y);
     row++;
     total+=y;
  }
  Canvas->TextOut(20,50+row*20,"=================");
  Canvas->TextOut(50,70+row*20,"羆