macro
<cfenv>
FE_INVALID
Invalid argument exception
This macro expands to a value of type int that identifies the floating-point exception raised on invalid arguments.
Invalid argument exceptions are raised to signal that the argument passed to a function is out of its domain (i.e., the function is not defined for that value), such as sqrt(-1.0).
The value returned by a function that raises this exception is unspecified.
FE_INVALID 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).
FE_INVALID is always defined if
math_errhandling has
MATH_ERREXCEPT set.
At least all of the above macro values are defined in
<cfenv> (even if not supported by the implementation).