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Showing content from https://cplusplus.com/reference/cfenv/FE_INEXACT/ below:

macro

<cfenv>

FE_INEXACT

Inexact result exception

This macro expands to a value of type int that identifies the floating-point exception raised on inexact results.

Inexact exceptions are raised to signal when the return type of an operation cannot represent the result with exact accuracy (such as 1.0/3.0 or sqrt(2.0) on most implementations), or when a function cannot produce an exact result for some other reason.

It is defined as a value that is an exact power of two, allowing several floating-point exceptions to be combined (using the bitwise OR operator: |) into a single value:

macro value description FE_DIVBYZERO Pole error: division by zero, or some other asymptotically infinite result (from finite arguments). FE_INEXACT Inexact: the result is not exact. FE_INVALID Domain error: At least one of the arguments is a value for which the function is not defined. FE_OVERFLOW Overflow range error: The result is too large in magnitude to be represented as a value of the return type. FE_UNDERFLOW Underflow range error: The result is too small in magnitude to be represented as a value of the return type. FE_ALL_EXCEPT All exceptions (selects all of the exceptions supported by the implementation). Certain library implementations may support additional floating-point exception values (with their corresponding macros also beginning with FE_).

Libraries may define in

<fenv.h>

only the macro values above they support (the others may not be defined).

At least all of the above macro values are defined in

<cfenv>

(even if not supported by the implementation).