新手求救！！

luyong509

LARGE_INTEGER litmp;
        LONGLONG QPart1,QPart2;
        double dfMinus,dfFreq,dfTim;
        QueryPerformanceFrequency(&litmp);
        //获得计数器的时钟频率
        dfFreq = (double)litmp.QuadPart;
        QueryPerformanceCounter(&litmp);
        // 获得初始值
        QPart1 = litmp.QuadPart;
        Sleep(100);
        QueryPerformanceCounter(&litmp);
        //获得终止值
        QPart2 = litmp.QuadPart;
        dfMinus = (double)(QPart2 - QPart1);
        dfTim = dfMinus / dfFreq;

这个应该怎么输出？printf（“%？？”，dfTim）？