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Similar to strtoul() except that it returns an unsigned long long int

Header file: #include <stdlib.h> Declaration: unsigned long long int strtoull(const char *restrict start, char **restrict end, int radix); #include <stdlib.h> int main(void){ char *start, *end; char a[100]; end = a; *start= "66896689"; printf("%d", strtoull(start, &end, 8)); }