trunc.c

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#include <math.h>
 
double trunc(double x)
{
    if (isinf(x))
    {
        return x;
    }
 
    if (x == 0.0 || x == -0.0)
    {
        return x;
    }
 
    if (isnan(x))
    {
        return NAN;
    }
 
    if (x > 0)
    {
        return floor(x);
    }
    else
    {
        return ceil(x);
    }
}