Getting greatest decimal accuracy out of G_PI
- From: zentara <zentara1 sbcglobal net>
- To: gtk-list gnome org
- Subject: Getting greatest decimal accuracy out of G_PI
- Date: Fri, 2 Feb 2007 16:30:17 -0500
Hi,
Please pardon my basic questions, but I am self taught
and run into questions I can't solve thru googling.
I see that G_PI is defined in the header to
3.14159265358979323846
So on my 32 bit Athlon machine, I get limited precision
to 15 decimal places, do I need a 64 bit machine for better
precision? Or is there a different format to use?
#include <gtk/gtk.h>
int main (){
/* #define G_PI 3.14159265358979323846E0 */
gdouble PI = G_PI;
g_print("3.14159265358979323846\n");
g_print("%0.20e\n",G_PI);
g_print("%0.20f\n",G_PI);
g_print("%0.20f\n",PI);
g_print("%0.20g\n",PI);
g_print("%0.20e\n",PI);
return 0;
}
Output gets limited to 15 decimal places
3.14159265358979323846 in header
3.14159265358979311600e+00 various formatted
3.14159265358979311600 .....
3.14159265358979311600 .....
3.141592653589793116 .....
Thanks.
zentara
--
I'm not really a human, but I play one on earth.
http://zentara.net/japh.html
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