C++ Reference: Standard C++ Library reference: C Library: cfenv: FE

C++官方参考链接：https://cplusplus.com/reference/cfenv/FE_INEXACT/

宏
<cfenv>
FE_INEXACT
int

不精确的结果异常
此宏展开为int类型的值，用于标识因不精确的结果引发的浮点异常。
当操作的返回类型不能精确地表示结果时（例如在大多数实现中，1.0/3.0或sqrt(2.0)），或者函数由于其他原因不能产生精确的结果时，会引发不精确异常。
它被定义为一个精确的2的幂的值，允许将多个浮点异常合并（使用按位或操作符：|）为单个值：

macro value（宏值）	description（描述）
FE_DIVBYZERO	Pole error: division by zero, or some other asymptotically infinite result (from finite arguments).（极点错误：除以零，或其他渐进无穷大的结果（来自有限的实参）。）
FE_INEXACT	Inexact: the result is not exact.（不精确：结果不精确。）
FE_INVALID	Domain error: At least one of the arguments is a value for which the function is not defined.（定义域错误：至少有一个实参是函数没有定义的值。）
FE_OVERFLOW	Overflow range error: The result is too large in magnitude to be represented as a value of the return type.（上溢范围错误：结果的绝对值大小太大，不能用返回类型的值表示。）
FE_UNDERFLOW	Underflow range error: The result is too small in magnitude to be represented as a value of the return type.（下溢范围错误：结果的绝对值大小太小，无法用返回类型的值表示。）
FE_ALL_EXCEPT	All exceptions (selects all of the exceptions supported by the implementation).（所有异常(选择实现支持的所有异常)。）

某些库实现可能支持额外的浮点异常值（其对应的宏也以FE_开头）。
C99
库可以在<fenv.h>中只定义它们支持的以上宏值（其他的可能没有定义）。
C++ 11
至少上述所有宏值都在<cfenv>中定义（即使实现不支持）。

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