libc.info: atoi

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`atoi', `atol'--string to integer

*Synopsis*
     #include <stdlib.h>
     int atoi(const char *S);
     long atol(const char *S);
   *Description*
`atoi' converts the initial portion of a string to an `int'.  `atol'
converts the initial portion of a string to a `long'.
   `atoi(s)' is implemented as `(int)strtol(s, NULL, 10).' `atol(s)' is
implemented as `strtol(s, NULL, 10).'
*Returns*
The functions return the converted value, if any. If no conversion was
made, `0' is returned.
*Portability*
`atoi' is ANSI.
   No supporting OS subroutines are required.