fegetround()

Returns the floating-point environment's current rounding direction.

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

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 fegetround()


#include <fenv.h>

#include <stdio.h>

#pragma STDC FENV_ACCESS on

int main(void)

{

int direction;

double x_up = 0.0;

double a = 5.0;

double b = 2.0;

double c = 3.0;

double d = 6.0;

double f = 2.5;

double g = 0.5;

double ubound = 0.0;

feclearexcept(FE_ALL_EXCEPT);

/* Calculate denominator. */

fesetround(FE_DOWNWARD);

x_up = f + g;

direction = fegetround(); /* Save the direction. */

fesetround(FE_UPWARD);

ubound = (a * b + c * d) / x_up;

fesetround(direction); /* Restore original direction. */

printf("(a * b + c * d) / (f + g) = %g\n", ubound);

return 0;

}

Output:

9.3333