// big number 1000000000000000000000000000.0 => float n; // overflow it repeat( 20 ) n *=> n; // test it <<< Math.isinf( n )>>>; // bye sanity 0 *=> n; // test it <<< Math.isnan( n )>>>; // more <<< 1.0 / 0.0 => Math.isinf>>>; <<< 0.0 / 0.0 => Math.isnan>>>; <<< Math.INFINITY, -Math.INFINITY>>>; <<< Math.INFINITY => Math.isinf>>>;