strtoul

strtoul, strtoull

Defined in header <stdlib.h>
unsigned long      strtoul( const char          *str, char          **str_end, 
                            int base );
(until C99)
unsigned long      strtoul( const char *restrict str, char **restrict str_end, 
                            int base );
(since C99)
unsigned long long strtoull( const char *restrict str, char **restrict str_end,
                             int base );
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