二种毫秒计算方法比较

//--------------------------------------------------------------------------- #include <vcl.h> #include <time.h> #pragma hdrstop #include "Unit1.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } //--------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { double i; DWORD dwStart = GetTickCount(); for(i=1;i<=66666666;i++); Memo1->Lines->Add(IntToStr(GetTickCount() - dwStart)); Label1->Caption= dwStart ; Label2->Caption= GetTickCount() ; //ShowMessage(IntToStr(GetTickCount() - dwStart)); } //--------------------------------------------------------------------------- void __fastcall TForm1::Button2Click(TObject *Sender) { clock_t start,end; start=clock(); for(double i=0;i<66666666;i++); end=clock(); Memo2->Lines->Add( FloatToStr(end-start)); Label1->Caption=FloatToStr(end); Label2->Caption=FloatToStr(start); } //---------------------------------------------------------------------------