feupdatedenv

 

C

语言

类型的支持

动态内存管理

错误处理

程序实用工具

日期和时间工具

字符串库

算法

数值计算

输入/输出的支持

本地化的支持

线程的支持 （C11）

原子操作 （C11）

 

数值计算

常见的数学函数

浮点环境

Complex number arithmetics

随机数的产生

类型的通用数学

 

浮点环境

功能 Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

feclearexcept （C99）

fetestexcept （C99）

feraiseexcept （C99）

fegetexceptflag fesetexceptflag （C99） （C99）

fegetround fesetround （C99） （C99）

fegetenv fesetenv （C99）

feholdexcept （C99）

feupdateenv （C99）

宏常量 Original: Macro constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

FE_ALL_EXCEPT FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW （C99）

FE_DOWNWARD FE_TONEAREST FE_TOWARDZERO FE_UPWARD （C99）

FE_DFL_ENV （C99）

 

Defined in header <<fenv.h>>
int feupdateenv( const fenv_t* envp );		（C99 起）

首先，记住目前提出的浮点异常，然后恢复浮点环境的对象所指向的envp（fesetenv类似），然后引发浮点异常，保存.

Original:

First, remembers the currently raised floating-point exceptions, then restores the floating-point environment from the object pointed to by envp (similar to fesetenv), then raises the floating-point exceptions that were saved.

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此功能可用于结束的非停止模式建立的先前调用feholdexcept.

Original:

This function may be used to end the non-stop mode established by an earlier call to feholdexcept.

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参数

envp

-

指针类型的对象fenv_t以前调用feholdexcept或fegetenv或等于FE_DFL_ENV Original: pointer to the object of type fenv_t set by an earlier call to feholdexcept or fegetenv or equal to FE_DFL_ENV The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

​0​成功，否则返回非零值.

Original:

​0​ on success, non-zero otherwise.

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另请参阅

feholdexcept （C99）	保存环境，清除所有状态标志，而忽略了未来所有的错误 Original: saves the environment, clears all status flags and ignores all future errors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
fegetenv fesetenv （C99）	保存或恢复当前浮点环境 Original: saves or restores the current floating point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
FE_DFL_ENV （C99）	默认的浮点环境 Original: default floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （宏不变）
C++ documentation for feupdateenv