ATOI的用法

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最新推荐文章于 2024-05-29 10:59:50 发布

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本文详细介绍了atoi、atol、atoll及atoq等函数的功能，这些函数用于将字符串转换为整数类型。文章解释了它们如何工作，并给出了各自的原型定义，同时指出了不同函数之间的差异及其返回值。

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ATOI(3)                   Linux Programmer’s Manual                   ATOI(3)

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

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
       SVID 3, POSIX.1, BSD 4.3, ISO/IEC 9899. ISO/IEC 9899:1990 (C89) and
       POSIX.1 (1996 edition) include the functions atoi() and atol() only;
       C99 adds the function atoll().

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() func-
       tion 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)

GNU                               2000-12-17                          ATOI(3)