Info Catalog elisp: Arithmetic Operations elisp: Numbers elisp: Bitwise Operations

elisp: Rounding Operations

 
 3.7 Rounding Operations
 =======================
 
 The functions ‘ffloor’, ‘fceiling’, ‘fround’, and ‘ftruncate’ take a
 floating-point argument and return a floating-point result whose value
 is a nearby integer.  ‘ffloor’ returns the nearest integer below;
 ‘fceiling’, the nearest integer above; ‘ftruncate’, the nearest integer
 in the direction towards zero; ‘fround’, the nearest integer.
 
  -- Function: ffloor float
      This function rounds FLOAT to the next lower integral value, and
      returns that value as a floating-point number.
 
  -- Function: fceiling float
      This function rounds FLOAT to the next higher integral value, and
      returns that value as a floating-point number.
 
  -- Function: ftruncate float
      This function rounds FLOAT towards zero to an integral value, and
      returns that value as a floating-point number.
 
  -- Function: fround float
      This function rounds FLOAT to the nearest integral value, and
      returns that value as a floating-point number.  Rounding a value
      equidistant between two integers returns the even integer.
 

Info Catalog elisp: Arithmetic Operations elisp: Numbers elisp: Bitwise Operations