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  1. Synopsis:
  2.    $trunc(<precision> <float>)
  3.  
  4. Technical:
  5.    This function truncates the given decimal number to the given precision,
  6.    rounding up or down as appropriate.
  7.  
  8. Practical:
  9.    This function is useful for rounding floating-point numbers.  It may be
  10.    used any time, though it is usually most useful when FLOATING_POINT_MATH
  11.    is turned on.
  12.  
  13. Returns:
  14.    truncated number
  15.  
  16. Examples:
  17.    $trunc(2 3.141592654)                 returns "3.14"
  18.    $trunc(5 3.54)                        returns "3.54000"
  19.  
  20. See Also:
  21.    set(4) floating_point_math
  22.  
  23.