tan(pi/2) - Pike-devel

29 Nov 2004


      Pike v7.6 release 13 running Hilfe v3.5 (Incremental Pike Frontend)
...
float a = Math.pi/2, b = 1.570796;
a;
(1) Result: 1.570796
...
b;
(2) Result: 1.570796
...
(a-b)*1000000;
(3) Result: 0.357628
...
sprintf("%.7f", a);
(4) Result: "1.5707964"
...
sprintf("%.7f", b);
(5) Result: "1.5707960"
...
As you can see, a is larger than b, but the difference is in the
seventh decimal so you can't see it in the default print format.
More precisely, b < Pi/2 < a.  (Pi/2 = 1.5707963..., which can't be
represented exactly with any floating point representation.)