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strtol

Usage

   #include <stdlib.h>
   long strtol(char *nptr,char **endptr,int base);

   ANSI

Description

   strtol converts the ASCII string pointed to by nptr to a long integer-
   value. It will recognize white space then an optionally signed string of
   digits. It will stop reading the string at the first character that doesn
   t represent a part of the number. A pointer to that character will be
   stored in the object endptr if endptr is not NULL.

   If base is zero the first character after the optional sign will
   determine the base of the conversion. If the first character is 0 and the
   second character is not x or X, then the string is interpreted as octal.
   If the first character is 0 and the second character is x or X it will be
   interpreted as a hexadecimal integer.

   If the first character is 1 through 9 the string is interpreted as
   decimal integer. The upper or lower case letters A to Z are assigned the
   values 10 through 35. Only letters with values less than the base are
   permitted. If the base is not 0, the base must be between 2 and 36.

Example 

   See strtoul

Return Value

   If correct values would cause an overflow then LONG_MAX or LONG_MIN is
   returned according to the sign and errno is set to ERANGE. If an
   unrecognized character is encountered before a legal character, zero is
   returned.

See Also

   atoi, atol, strtoul, scanf