ATOI(3) BSD Programmer's Manual ATOI(3)
atoi - convert ASCII string to integer
#include <stdlib.h> int atoi(const char *nptr);
The atoi() function converts the initial portion of the string pointed to by nptr to integer representation. It is equivalent to: (int)strtol(nptr, (char **)NULL, 10);
atof(3), atol(3), strtod(3), strtol(3), strtonum(3), strtoul(3)
The atoi() function conforms to ANSI X3.159-1989 ("ANSI C").
atoi does no overflow checking, handles unsigned numbers poorly, and han- dles strings containing trailing extra characters (like "123abc") poorly. Careful use of strtol(3) and strtoul(3) can alleviate these problems, but strtonum(3) can be used to convert numbers from strings much more safely and easily. MirOS BSD #10-current June 4, 1993 1
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