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Manual Reference Pages  - ATOI (3)

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NAME

atoi, atol, atoll, atoq - convert a string to an integer

CONTENTS

Synopsis
Description
Notes

SYNOPSIS

#include <stdlib.h> 



int atoi(const char *nptr); 




long atol(const char *nptr); 




long long atoll(const char *nptr); 




long long atoq(const char *nptr); 

DESCRIPTION

The atoi() function converts the initial portion of the string pointed to by nptr to int. The behaviour is the same as

strtol(nptr, (char **)NULL, 10);

except that atoi() does not detect errors.

The atol() and atoll() functions behave the same as atoi(), except that they convert the initial portion of the string to their return type of long or long long. atoq() is an obsolete name for atoll().

RETURN VALUE

The converted value.

CONFORMING TO

SVr4, POSIX.1-2001, 4.3BSD, C99. C89 and POSIX.1-1996 include the functions atoi() and atol() only. atoq(3) is a GNU extension.

NOTES

The non-standard atoq() function is not present in libc 4.6.27 or glibc 2, but is present in libc5 and libc 4.7 (though only as an inline function in <stdlib.h> until libc 5.4.44). The atoll() function is present in glibc 2 since version 2.0.2, but not in libc4 or libc5.

SEE ALSO

atof(3), strtod(3), strtol(3), strtoul(3)

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GNU

ATOI (3)

2000-12-17

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