// filename:c2011-F-8-4-ex.c
// original examples and/or notes:
// 		(c) ISO/IEC JTC1 SC22 WG14 N1570, April 12, 2011
// 			C2011 F.8.4 Constant expressions
// compile and output mechanism:
// 		(c) Ogawa Kiyoshi, kaizen@gifu-u.ac.jp, December.29, 2013
// compile errors and/or wornings:
// 		(c) Apple LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
// 			Target: x86_64-apple-darwin11.4.2 //Thread model: posix
// 		(c) LLVM 2003-2009 University of Illinois at Urbana-Champaign.
#include <stdio.h>
// Example
#include <fenv.h>
#pragma STDC FENV_ACCESS ON
void f(void)
{
float w[] = { 0.0/0.0 }; // raises an exception
static float x = 0.0/0.0; // does not raise an exception
float y = 0.0/0.0; // raises an exception
double z = 0.0/0.0; // raises an exception
	printf("%f %f %f %lf \n",*w,x,y,z);
/* ... */
}
int main(void)
{
	f();
return printf("F.8.4 Constant expressions\n");
}
// warning may be
//c2011-F-8-4-ex.c:14:14: warning: pragma STDC FENV_ACCESS ON is not supported, ignoring pragma [-Wunknown-pragmas]
//#pragma STDC FENV_ACCESS ON
//             ^
//1 warning generated.
//
// output may be 
//nan nan nan nan 
//F.8.4 Constant expressions