`atol.3p` ( 3 )

преобразовать строку в длинное целое число (convert a string to a long integer)

Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

Имя (Name)

atol, atoll — convert a string to a long integer

Синопсис (Synopsis)

#include <stdlib.h>

long atol(const char *nptr); long long atoll(const char *nptr);

Описание (Description)

The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1‐2017 defers to the ISO C standard.

Except as noted below, the call atol(nptr) shall be equivalent to:

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

Except as noted below, the call to atoll(nptr) shall be equivalent to:

strtoll(nptr, (char **)NULL, 10)

The handling of errors may differ. If the value cannot be represented, the behavior is undefined.

Возвращаемое значение (Return value)

These functions shall return the converted value if the value can be represented.

Ошибки (Error)

No errors are defined.

The following sections are informative.

Примеры (Examples)

None.

Использование в приложениях (Application usage)

If the number is not known to be in range, strtol() or strtoll() should be used because atol() and atoll() are not required to perform any error checking.

Обоснование (Rationale)

None.

Будущие направления (Future directions)