Question

Greeting !!

The following code works fine….at least more than one second will execute expx function
in function Getexp , I called Getexp every 0.01 second for 100 times,
actually expx function will be called just one time only , that is what I want !!

But , my user need to change to at least more than 0.5 second to call expx ,
since the following code works in tick1 , tick2 in integer type ,
I need advice to change not too many codes below and will satisfy user needs ….

What function will be best suitable foe my case ? time_t won’t work for me in 0.5 sec case!

double Getexp(double valuex)
{
    double wgt=0.9 ;
    static double value_t0=0.0 ;
    static double value_t1=0.0 ;
    double dret = 0.0 ;
    static time_t tick1=0 ,tick2=0 ;

    if(value_t0 < 0.0001)
    {
        tick1=time(NULL);
        tick2=tick1 ;
        value_t0 = valuex ;
        value_t1 = valuex ;
        dret = expx(value_t1,value_t0,wgt) ;
        value_t0 = dret ;
        return value_t0   ;
    }
    tick2=time(NULL);
    if(tick2 > tick1)
    {
        tick1 = tick2 ;
        value_t1 = valuex ;
        dret = expx(value_t1,value_t0,wgt) ;
        value_t0 = dret ;
        return value_t0 ;
    }else
    {
        return value_t0  ;
    }
}

Answer 1

It is rather difficult to assess what is being asked. But I suspect you are complaining that “time()” just has accuracy to the nearest second, but you need sub-second accuracy.

Some clock functions to explore instead of calling “time”.

GetTickCount (Windows)

GetSystemTime (Windows)

gettimeofday

clock_gettime

In other words, consider converting your code to process time in terms of milliseconds and use one of the appropriate calls above to get the that time