feraiseexcept()

Sets floating-point environment flags.

  #include <fenv.h>
  void feraiseexcept(int e);

Parameter

e

Zero or more exceptions to set.

Remarks

This facility may not be available on configurations of the EWL that run on platforms that do not have floating-point math capabilities.

Listing: Example of feraiseexcept()


#include <fenv.h>

#include <stdio.h>

#pragma STDC FENV_ACCESS on

int main(void)

{

double x = 123.0;

double y = 3.0;

double result;

/* Reset flags before starting the calculation. */

feclearexcept(FE_ALL_EXCEPT);

result = x / y; /* Should not set the FE_DIVBYZERO flag. */

if (fetestexcept(FE_DIVBYZERO | FE_INVALID))

printf("Division by zero and invalid operation.\n");

feraiseexcept(FE_DIVBYZERO);

if (fetestexcept(FE_DIVBYZERO))

printf("Division by zero.\n");

return 0;

}

Output:

Division by zero.