Accurate timing: nanoseconds

// Nanosecond <br/>__ int64 count (void) <br/>{< br/> _ ASM _ emit 0x0f <br/> _ ASM _ emit 0x31 <br/>}</P> <p> cwinapp theapp; </P> <p> using namespace STD; </P> <p> int _ tmain (INT argc, tchar * argv [], tchar * envp []) <br/>{< br/> int nretcode = 0; </P> <p> // an error is displayed when the MFC initialization fails. <br/> If (! Afxwininit (: getmodulehandle (null), null,: getcommandline (), 0) <br/>{< br/> // todo: change error <SPAN class = 'wp _ keywordlink '> Code </span> to meet your needs <br/> _ tprintf (_ T ("Fatal error: MFC initialization failed/N "); <br/> nretcode = 1; <br/>}< br/> else <br/>{< br/> // todo: write code for the behavior of the <SPAN class = 'wp _ keywordlink '> Program </span>. <Br/>}</P> <p> int n1 = count (); <br/> int n2 = gettickcount (); <br/> for (INT I = 0; I <5; I ++) <br/> {<br/> printf ("<timeVal-1> % d/N ", count ()-N1); <br/> n1 = count (); <br/> printf ("<timeVal-2> % d/N", gettickcount ()-N2 ); <br/> n2 = gettickcount (); <br/>}< br/> // For (INT I = 0; I <5; I ++) <br/> // {<br/> // printf ("<timeVal-2> % d/N", gettickcount ()-N2 ); <br/> // n2 = gettickcount (); <br/>/}< br/> system ("pause"); </P> <p> return nretcode; <br/>}