text: atoi, atol, atoll - convert a string to an integer
  Current Version:
  Linux Kernel - 3.80
  Synopsis
  #include <stdlib.h> int atoi(const char *nptr);
  long atol(const char *nptr);
  long long atoll Value
  The converted value.
  Attributes
  Conforming To
  SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996 include the functions atoi() and atol() only.
  Notes
  Linux libc provided atoq() as an obsolete name for atoll(); atoq() is not provided by glibc. Mon Mar 29 22:39:41 1993, David Metcalfe Modified Sat Jul 24 21:38:42 1993, Rik Faith (faith@cs.unc.edu) Modified Sun Dec 17 18:35:06 2000, Joseph S. Myers