atoi() — Convert character string to integer

Standards

Standards / Extensions	C or C++	Dependencies
ISO C POSIX.1 XPG4 XPG4.2 C99 Single UNIX Specification, Version 3	both

#include <stdlib.h>

int atoi(const char *nptr);

The atoi() function converts the initial portion of the string pointed to by nptr to a 'int'. This is equivalent to

(int)strtol(nptr, NULL, 10)

There are no documented errno values.