fork download
copy 
  1. #include <iostream>
  2. #include <stdlib.h>
  3. #include <assert.h>
  4. using namespace std;
  5. int main(int argc, char **argv) {
  6.     char s[32];
  7.     auto finish = argc > 1 ? strtod(argv[1], NULL) : 2.0;
  8.     assert(finish != 0.0);
  9.     auto format = argc > 2 ? argv[2] : "%.17g";
  10.     auto d = finish / 2.0;
  11.     auto f = d;
  12.     cout << hexfloat;
  13.     for (auto i = 0; i < 54; i++) {
  14.         snprintf(s, 31, format, d);
  15.         assert(strtod(s, NULL) == d);
  16.         cout << s << " = " << d << endl;
  17.         if (d == finish) break;
  18.         f /= 2; d += f;
  19.     }
  20.     exit(0);
  21. }
  22.  
  23.  
Success #stdin #stdout 0s 3456KB
comments ()
stdin
copy 
Standard input is empty
stdout
copy 
1 = 0x1p+0
1.5 = 0x1.8p+0
1.75 = 0x1.cp+0
1.875 = 0x1.ep+0
1.9375 = 0x1.fp+0
1.96875 = 0x1.f8p+0
1.984375 = 0x1.fcp+0
1.9921875 = 0x1.fep+0
1.99609375 = 0x1.ffp+0
1.998046875 = 0x1.ff8p+0
1.9990234375 = 0x1.ffcp+0
1.99951171875 = 0x1.ffep+0
1.999755859375 = 0x1.fffp+0
1.9998779296875 = 0x1.fff8p+0
1.99993896484375 = 0x1.fffcp+0
1.999969482421875 = 0x1.fffep+0
1.9999847412109375 = 0x1.ffffp+0
1.9999923706054688 = 0x1.ffff8p+0
1.9999961853027344 = 0x1.ffffcp+0
1.9999980926513672 = 0x1.ffffep+0
1.9999990463256836 = 0x1.fffffp+0
1.9999995231628418 = 0x1.fffff8p+0
1.9999997615814209 = 0x1.fffffcp+0
1.9999998807907104 = 0x1.fffffep+0
1.9999999403953552 = 0x1.ffffffp+0
1.9999999701976776 = 0x1.ffffff8p+0
1.9999999850988388 = 0x1.ffffffcp+0
1.9999999925494194 = 0x1.ffffffep+0
1.9999999962747097 = 0x1.fffffffp+0
1.9999999981373549 = 0x1.fffffff8p+0
1.9999999990686774 = 0x1.fffffffcp+0
1.9999999995343387 = 0x1.fffffffep+0
1.9999999997671694 = 0x1.ffffffffp+0
1.9999999998835847 = 0x1.ffffffff8p+0
1.9999999999417923 = 0x1.ffffffffcp+0
1.9999999999708962 = 0x1.ffffffffep+0
1.9999999999854481 = 0x1.fffffffffp+0
1.999999999992724 = 0x1.fffffffff8p+0
1.999999999996362 = 0x1.fffffffffcp+0
1.999999999998181 = 0x1.fffffffffep+0
1.9999999999990905 = 0x1.ffffffffffp+0
1.9999999999995453 = 0x1.ffffffffff8p+0
1.9999999999997726 = 0x1.ffffffffffcp+0
1.9999999999998863 = 0x1.ffffffffffep+0
1.9999999999999432 = 0x1.fffffffffffp+0
1.9999999999999716 = 0x1.fffffffffff8p+0
1.9999999999999858 = 0x1.fffffffffffcp+0
1.9999999999999929 = 0x1.fffffffffffep+0
1.9999999999999964 = 0x1.ffffffffffffp+0
1.9999999999999982 = 0x1.ffffffffffff8p+0
1.9999999999999991 = 0x1.ffffffffffffcp+0
1.9999999999999996 = 0x1.ffffffffffffep+0
1.9999999999999998 = 0x1.fffffffffffffp+0
2 = 0x1p+1
https://ideone.com/FOT1cS
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!