Truncates the argument to an integral value.
    This function is OpenVMS Alpha and Integrity servers only.
    Format
      #include  <math.h>
      double trunc  (double x);
      float truncf  (float x,);
      long double truncl  (long double x);
1 – Argument
 x
    A floating-point number.
2 – Return Value
n The truncated, integral value of the argument.