// filename:c2011-F-9-1-ex.c
// original examples and/or notes:
// 		(c) ISO/IEC JTC1 SC22 WG14 N1570, April 12, 2011
// 			C2011 F.9.1 Global transformations
// 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>
#include <complex.h>
// Example
#include <fenv.h>
#pragma STDC FENV_ACCESS ON
void f(double x)
{
int n;
/* ... */
for (int i = 0; i < n; i++) x + 1;
/* ... */
printf("%d %lf \n",n,x);
}
int main(void)
{
int n;
double x;
f(9);
if (0 < n) x + 1;
printf("%d %lf \n",n,x);
return printf("F.9.1 Global transformations\n");
}
// warning may be 
// c2011-F-9-1-ex.c:15:14: warning: pragma STDC FENV_ACCESS ON is not supported, ignoring pragma [-Wunknown-pragmas]
// #pragma STDC FENV_ACCESS ON
//              ^
// c2011-F-9-1-ex.c:20:31: warning: expression result unused [-Wunused-value]
// for (int i = 0; i < n; i++) x + 1;
//                             ~ ^ ~
// c2011-F-9-1-ex.c:28:15: warning: expression result unused [-Wunused-value]
//         if (0 < n) x + 1;
//                    ~ ^ ~
// 3 warnings generated.
// output may be
// -1038565372 9.000000 //left value are changing
// 1847459929 0.000000 // left value are changing
// F.9.1 Global transformations