@@ -568,49 +568,55 @@ always available.
568568
569569 .. tabularcolumns :: |l|l|L|
570570
571- +---------------------+----------------+--------------------------------------------------+
572- | attribute | float.h macro | explanation |
573- +=====================+================+==================================================+
574- | :const: `epsilon ` | DBL_EPSILON | difference between 1.0 and the least value |
575- | | | greater than 1.0 that is representable as a float|
576- | | | |
577- | | | See also :func: `math.ulp `. |
578- +---------------------+----------------+--------------------------------------------------+
579- | :const: `dig ` | DBL_DIG | maximum number of decimal digits that can be |
580- | | | faithfully represented in a float; see below |
581- +---------------------+----------------+--------------------------------------------------+
582- | :const: `mant_dig ` | DBL_MANT_DIG | float precision: the number of base-``radix `` |
583- | | | digits in the significand of a float |
584- +---------------------+----------------+--------------------------------------------------+
585- | :const: `max ` | DBL_MAX | maximum representable positive finite float |
586- +---------------------+----------------+--------------------------------------------------+
587- | :const: `max_exp ` | DBL_MAX_EXP | maximum integer *e* such that ``radix**(e-1)`` is|
588- | | | a representable finite float |
589- +---------------------+----------------+--------------------------------------------------+
590- | :const: `max_10_exp ` | DBL_MAX_10_EXP | maximum integer *e* such that ``10**e`` is in the|
591- | | | range of representable finite floats |
592- +---------------------+----------------+--------------------------------------------------+
593- | :const: `min ` | DBL_MIN | minimum representable positive *normalized* float|
594- | | | |
595- | | | Use :func: `math.ulp(0.0) <math.ulp> ` to get the |
596- | | | smallest positive *denormalized * representable |
597- | | | float. |
598- +---------------------+----------------+--------------------------------------------------+
599- | :const: `min_exp ` | DBL_MIN_EXP | minimum integer *e* such that ``radix**(e-1)`` is|
600- | | | a normalized float |
601- +---------------------+----------------+--------------------------------------------------+
602- | :const: `min_10_exp ` | DBL_MIN_10_EXP | minimum integer *e * such that ``10**e `` is a |
603- | | | normalized float |
604- +---------------------+----------------+--------------------------------------------------+
605- | :const: `radix ` | FLT_RADIX | radix of exponent representation |
606- +---------------------+----------------+--------------------------------------------------+
607- | :const: `rounds ` | FLT_ROUNDS | integer constant representing the rounding mode |
608- | | | used for arithmetic operations. This reflects |
609- | | | the value of the system FLT_ROUNDS macro at |
610- | | | interpreter startup time. See section 5.2.4.2.2 |
611- | | | of the C99 standard for an explanation of the |
612- | | | possible values and their meanings. |
613- +---------------------+----------------+--------------------------------------------------+
571+ +---------------------+---------------------+--------------------------------------------------+
572+ | attribute | float.h macro | explanation |
573+ +=====================+=====================+==================================================+
574+ | ``epsilon `` | ``DBL_EPSILON `` | difference between 1.0 and the least value |
575+ | | | greater than 1.0 that is representable as a float|
576+ | | | |
577+ | | | See also :func: `math.ulp `. |
578+ +---------------------+---------------------+--------------------------------------------------+
579+ | ``dig `` | ``DBL_DIG `` | maximum number of decimal digits that can be |
580+ | | | faithfully represented in a float; see below |
581+ +---------------------+---------------------+--------------------------------------------------+
582+ | ``mant_dig `` | ``DBL_MANT_DIG `` | float precision: the number of base-``radix `` |
583+ | | | digits in the significand of a float |
584+ +---------------------+---------------------+--------------------------------------------------+
585+ | ``max `` | ``DBL_MAX `` | maximum representable positive finite float |
586+ +---------------------+---------------------+--------------------------------------------------+
587+ | ``max_exp `` | ``DBL_MAX_EXP `` | maximum integer *e* such that ``radix**(e-1)`` is|
588+ | | | a representable finite float |
589+ +---------------------+---------------------+--------------------------------------------------+
590+ | ``max_10_exp `` | ``DBL_MAX_10_EXP `` | maximum integer *e* such that ``10**e`` is in the|
591+ | | | range of representable finite floats |
592+ +---------------------+---------------------+--------------------------------------------------+
593+ | ``min `` | ``DBL_MIN `` | minimum representable positive *normalized* float|
594+ | | | |
595+ | | | Use :func: `math.ulp(0.0) <math.ulp> ` to get the |
596+ | | | smallest positive *denormalized * representable |
597+ | | | float. |
598+ +---------------------+---------------------+--------------------------------------------------+
599+ | ``min_exp `` | ``DBL_MIN_EXP `` | minimum integer *e* such that ``radix**(e-1)`` is|
600+ | | | a normalized float |
601+ +---------------------+---------------------+--------------------------------------------------+
602+ | ``min_10_exp `` | ``DBL_MIN_10_EXP `` | minimum integer *e * such that ``10**e `` is a |
603+ | | | normalized float |
604+ +---------------------+---------------------+--------------------------------------------------+
605+ | ``radix `` | ``FLT_RADIX `` | radix of exponent representation |
606+ +---------------------+---------------------+--------------------------------------------------+
607+ | ``rounds `` | ``FLT_ROUNDS `` | integer representing the rounding mode for |
608+ | | | floating-point arithmetic. This reflects the |
609+ | | | value of the system ``FLT_ROUNDS `` macro at |
610+ | | | interpreter startup time: |
611+ | | | ``-1 `` indeterminable, |
612+ | | | ``0 `` toward zero, |
613+ | | | ``1 `` to nearest, |
614+ | | | ``2 `` toward positive infinity, |
615+ | | | ``3 `` toward negative infinity |
616+ | | | |
617+ | | | All other values for ``FLT_ROUNDS `` characterize |
618+ | | | implementation-defined rounding behavior. |
619+ +---------------------+---------------------+--------------------------------------------------+
614620
615621 The attribute :attr: `sys.float_info.dig ` needs further explanation. If
616622 ``s `` is any string representing a decimal number with at most
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