C Standard Library

C <fenv.h> - FE_OVERFLOW

The FE_OVERFLOW macro expands to a value of type integer constant expression that is distinct powers of 2, which uniquely identifies the floating-point exception raised on overflow range errors.

Overflow range errors occur when the result of an operation cannot be represented as a value of its return type because its magnitude is too large (either positive or negative). Operations that overflow while the default rounding mode is in effect, return a positive or a negative HUGE_VAL (or HUGE_VALF or HUGE_VALL).

Definition in the <fenv.h> header file is:

#define FE_OVERFLOW  /*implementation defined power of 2*/

The details about all floating-point exception macros are listed below:

Macros	Description
FE_DIVBYZERO	Pole error exception occurred in an earlier floating-point operation.
FE_INEXACT	Inexact result exception occurred in an earlier floating-point operation (rounding was necessary to store the result).
FE_INVALID	Invalid argument exception occurred (domain error occurred) in an earlier floating-point operation.
FE_OVERFLOW	Overflow range error exception occurred in an earlier floating-point operation (result was too large to be representable).
FE_UNDERFLOW	Underflow range error exception occurred in an earlier floating-point operation (result was subnormal with a loss of precision).
FE_ALL_EXCEPT	Bitwise OR of all supported floating-point exceptions.

Certain library implementations may define additional macro constants in <fenv.h> to identify additional floating-point exceptions (with their corresponding macros also beginning with FE_).

See math_errhandling for more details.

Example:

The example below shows the usage of FE_OVERFLOW macro.

#include <stdio.h>
#include <fenv.h>
#include <float.h>
 
int main (){
  printf("DBL_MAX*2 = %f\n", (DBL_MAX*2));
  if(fetestexcept(FE_OVERFLOW))
    printf("Domain error is reported.\n");
  else
    printf("Domain error is not reported.\n");

  return 0;
}

The output of the above code will be:

DBL_MAX*2 = inf
Domain error is reported.

❮ C <fenv.h> Library