Arguments

 

nptr

   A pointer to the wide-character string to be converted to an
   unsigned long.
 

endptr

   The address of an object where the function can store the address
   of the first unrecognized character encountered in the conversion
   process (the character that follows the last character in the
   string being converted). If endptr is a NULL pointer, the address
   of the first unrecognized character is not retained.
 

base

   The value, 2 through 36, to use as the base for the conversion.

   If base is 16, leading zeros after the optional sign are ignored,
   and 0x or 0X is ignored.

   If base is 0, the sequence of characters is interpreted by
   the same rules used to interpret an integer constant: after
   the optional sign, a leading 0 indicates octal conversion, a
   leading 0x or 0X indicates hexadecimal conversion, and any other
   combination of leading characters indicates decimal conversion.