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strtoul
Converts a string to an unsigned long int representation.
Syntax
#include <stdlib.h>
unsigned long int strtoul (const char *str,
char **ptr, int base);
Parameters
str A pointer to a character string to be converted. If base
is set to zero, leading characters in str define the
conversion. After an optional leading sign, a leading zero
indicates octal conversion, and a leading "0x" or "0X"
indicates hexadecimal conversion. Otherwise, decimal
conversion is used.
ptr If ptr is not NULL, a pointer to the character terminating
the scan is stored in the object pointed to by ptr.
base If base is between 2 and 36, it is used as the base for
conversion. After an optional leading sign, leading zeros
are ignored, and "0x" or "0X" is ignored if base is 16. If
base is set to zero, the string itself determines the base.
Return Values
!=0 A string value converted to a long integer.
0 When *ptr is set to str and a value of zero is returned, it
indicates that no number can be formed.
ULONG_MAX The conversion would cause an overflow; errno is set to
ERANGE.
Description
The strtoul function returns as an unsigned long int the value
represented by the character string pointed to by str.
See Also
strtod(), strtol(), atof(), ANSI C 4.10.1.6