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  1. class StringifyDouble {
  2.     public static void main(String[] args) {
  3.         Double finish = 2.0;
  4.         if (args.length > 0) {
  5.             try {
  6.                 finish = Double.parseDouble(args[0]);
  7.             } catch (NumberFormatException e) {
  8.                 System.err.println("Parse " + args[0] + " failed.");
  9.                 System.exit(-1);
  10.             }
  11.         }
  12.         Double d = finish/2;
  13.         Double f = d;
  14.         for (int i = 0; i < 54; i++) {
  15.             String s = String.format("%.17g", d);
  16.             assert Double.parseDouble(s) == d;
  17.             System.out.println(
  18.                 String.format("%s == %a",s, d)
  19.             );
  20.             if (d == finish) break;
  21.             f /= 2; d += f;
  22.         }
  23.     }
  24. }
  25.  
Success #stdin #stdout 0.13s 320640KB
comments ()
stdin 
Standard input is empty
stdout 
1.0000000000000000 == 0x1.0p0
1.5000000000000000 == 0x1.8p0
1.7500000000000000 == 0x1.cp0
1.8750000000000000 == 0x1.ep0
1.9375000000000000 == 0x1.fp0
1.9687500000000000 == 0x1.f8p0
1.9843750000000000 == 0x1.fcp0
1.9921875000000000 == 0x1.fep0
1.9960937500000000 == 0x1.ffp0
1.9980468750000000 == 0x1.ff8p0
1.9990234375000000 == 0x1.ffcp0
1.9995117187500000 == 0x1.ffep0
1.9997558593750000 == 0x1.fffp0
1.9998779296875000 == 0x1.fff8p0
1.9999389648437500 == 0x1.fffcp0
1.9999694824218750 == 0x1.fffep0
1.9999847412109375 == 0x1.ffffp0
1.9999923706054688 == 0x1.ffff8p0
1.9999961853027344 == 0x1.ffffcp0
1.9999980926513672 == 0x1.ffffep0
1.9999990463256836 == 0x1.fffffp0
1.9999995231628418 == 0x1.fffff8p0
1.9999997615814210 == 0x1.fffffcp0
1.9999998807907104 == 0x1.fffffep0
1.9999999403953552 == 0x1.ffffffp0
1.9999999701976776 == 0x1.ffffff8p0
1.9999999850988388 == 0x1.ffffffcp0
1.9999999925494194 == 0x1.ffffffep0
1.9999999962747097 == 0x1.fffffffp0
1.9999999981373549 == 0x1.fffffff8p0
1.9999999990686774 == 0x1.fffffffcp0
1.9999999995343387 == 0x1.fffffffep0
1.9999999997671694 == 0x1.ffffffffp0
1.9999999998835847 == 0x1.ffffffff8p0
1.9999999999417923 == 0x1.ffffffffcp0
1.9999999999708962 == 0x1.ffffffffep0
1.9999999999854480 == 0x1.fffffffffp0
1.9999999999927240 == 0x1.fffffffff8p0
1.9999999999963620 == 0x1.fffffffffcp0
1.9999999999981810 == 0x1.fffffffffep0
1.9999999999990905 == 0x1.ffffffffffp0
1.9999999999995453 == 0x1.ffffffffff8p0
1.9999999999997726 == 0x1.ffffffffffcp0
1.9999999999998863 == 0x1.ffffffffffep0
1.9999999999999432 == 0x1.fffffffffffp0
1.9999999999999716 == 0x1.fffffffffff8p0
1.9999999999999858 == 0x1.fffffffffffcp0
1.9999999999999930 == 0x1.fffffffffffep0
1.9999999999999964 == 0x1.ffffffffffffp0
1.9999999999999982 == 0x1.ffffffffffff8p0
1.9999999999999991 == 0x1.ffffffffffffcp0
1.9999999999999996 == 0x1.ffffffffffffep0
1.9999999999999998 == 0x1.fffffffffffffp0
2.0000000000000000 == 0x1.0p1
https://ideone.com/2e4Svz
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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