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 7.6.1.1 Generic Numeric Formatting Parameters
 .............................................
 
 These are the standard members of `struct lconv'; there may be others.
 
 `char *decimal_point'
 `char *mon_decimal_point'
      These are the decimal-point separators used in formatting
      non-monetary and monetary quantities, respectively.  In the `C'
      locale, the value of `decimal_point' is `"."', and the value of
      `mon_decimal_point' is `""'.  
 
 `char *thousands_sep'
 `char *mon_thousands_sep'
      These are the separators used to delimit groups of digits to the
      left of the decimal point in formatting non-monetary and monetary
      quantities, respectively.  In the `C' locale, both members have a
      value of `""' (the empty string).
 
 `char *grouping'
 `char *mon_grouping'
      These are strings that specify how to group the digits to the left
      of the decimal point.  `grouping' applies to non-monetary
      quantities and `mon_grouping' applies to monetary quantities.  Use
      either `thousands_sep' or `mon_thousands_sep' to separate the digit
      groups.  
 
      Each member of these strings is to be interpreted as an integer
      value of type `char'.  Successive numbers (from left to right)
      give the sizes of successive groups (from right to left, starting
      at the decimal point.)  The last member is either `0', in which
      case the previous member is used over and over again for all the
      remaining groups, or `CHAR_MAX', in which case there is no more
      grouping--or, put another way, any remaining digits form one large
      group without separators.
 
      For example, if `grouping' is `"\04\03\02"', the correct grouping
      for the number `123456787654321' is `12', `34', `56', `78', `765',
      `4321'.  This uses a group of 4 digits at the end, preceded by a
      group of 3 digits, preceded by groups of 2 digits (as many as
      needed).  With a separator of `,', the number would be printed as
      `12,34,56,78,765,4321'.
 
      A value of `"\03"' indicates repeated groups of three digits, as
      normally used in the U.S.
 
      In the standard `C' locale, both `grouping' and `mon_grouping'
      have a value of `""'.  This value specifies no grouping at all.
 
 `char int_frac_digits'
 `char frac_digits'
      These are small integers indicating how many fractional digits (to
      the right of the decimal point) should be displayed in a monetary
      value in international and local formats, respectively.  (Most
      often, both members have the same value.)
 
      In the standard `C' locale, both of these members have the value
      `CHAR_MAX', meaning "unspecified".  The ISO standard doesn't say
      what to do when you find this value; we recommend printing no
      fractional digits.  (This locale also specifies the empty string
      for `mon_decimal_point', so printing any fractional digits would be
      confusing!)
 

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