#include <stdio.h>
#include <windows.h>

void main(void)
{
    LARGE_INTEGER cycle;
    double CPU_Clock;

    for( int i = 0; i < 5;i++ ) {
        __asm {
            cpuid
            rdtsc
            mov   cycle.LowPart, eax
            mov   cycle.HighPart, edx
        } // (1)

        Sleep(1000); // (2)

        __asm {
            cpuid
            rdtsc
            sub   eax, cycle.LowPart
            sub   edx, cycle.HighPart
            mov   cycle.LowPart, eax
            mov   cycle.HighPart, edx
        } // (3)

        CPU_Clock = (double)cycle.LowPart;
        CPU_Clock /= 1000000; // (4)
        printf("%4.2lf[MHz]\n", CPU_Clock );
    }
}