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FE_DIVBYZERO, FE_INEXACT, FE_INVALID, FE_OVERFLOW, FE_UNDERFLOW, FE_ALL_EXCEPT

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Defined in header <<fenv.h>>
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#define FE_DIVBYZERO    /*implementation defined power of 2*/
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#define FE_INEXACT      /*implementation defined power of 2*/
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#define FE_INVALID      /*implementation defined power of 2*/
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#define FE_OVERFLOW     /*implementation defined power of 2*/
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#define FE_UNDERFLOW    /*implementation defined power of 2*/
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#define FE_ALL_EXCEPT  FE_DIVBYZERO | FE_INEXACT | \

                       FE_INVALID | FE_OVERFLOW |  \

                       FE_UNDERFLOW
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All these macro constants (except FE_ALL_EXCEPT) expand to integer constant expressions that are distinct powers of 2, which uniquely identify all supported floating-point exceptions. Each macro is only defined if it is supported.

The macro constant FE_ALL_EXCEPT, which expands to the bitwise OR of all other FE_*, is always defined and is zero if floating-point exceptions are not supported by the implementation.

Constant Explanation
FE_DIVBYZERO division by zero occurred during the earlier floating-point operation
FE_INEXACT inexact result: rounding was necessary to store the result of the earlier floating-point operation
FE_INVALID invalid operation: the earlier floating-point operation could not performed
FE_OVERFLOW the result of the earlier floating-point operation was too large to be representable
FE_UNDERFLOW the result of the earlier floating-point operation was subnormal
FE_ALL_EXCEPT bitwise OR of all supported floating-point exceptions

The implementation may define additional macro constants in <fenv.h> to identify additional floating-point exceptions. All such constants begin with FE_ followed by at least one uppercase letter.

Example

See also

C++ documentation for floating point exception macros