I set tow functions, one to enable exception for floating point and one to disable exception.
In the code bellow, I have enabled tow exception in one time (_EM_ZERODIVIDE and _EM_OVERFLOW), after I need to disable just _EM_ZERODIVIDE and let _EM_OVERFLOW enabled.
What argument to pass to my function ResetFloatExeption (....).
See code for detail.
#include <stdio.h>
#include <float.h>
#include <math.h>
#pragma fenv_access (on)
// SetFloatExeption
void SetFloatExeption (unsigned int new_control)
{
_clearfp();
_controlfp_s(0,new_control, _MCW_EM);
}
// ResetFloatExeption
void ResetFloatExeption (unsigned int new_control)
{
_clearfp();
_controlfp_s(0,new_control, _MCW_EM);
}
//*************** main ****//
void main( void )
{
unsigned int old_control;
double a = 1.1;
double b = 0.0;
float d;
_controlfp_s(&old_control,0,0);
// Enable exception _EM_ZERODIVIDE and _EM_OVERFLOW
SetFloatExeption (old_control & ~(_EM_ZERODIVIDE | _EM_OVERFLOW) );
// Here, How to call ResetFloatExeption to disable juste _EM_ZERODIVIDE and let _EM_OVERFLOW enabled
ResetFloatExeption(old_control & ???);
fprintf(stdout,"a/b= %.10e\n",a/b);
int exponent = 50;
d = pow(10.0, exponent);
printf("d = %f\n",d);
}
old_control & ~_EM_ZERODIVIDE | _EM_OVERFLOW
Both of your functions do the same. May be you should delete one?