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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <assert.h>
  4. int main(int argc, char **argv) {
  5.     char s[32];
  6.     double finish = argc > 1 ? strtod(argv[1], NULL) : 2.0;
  7.     assert(finish != 0.0);
  8.     char *format = argc > 2 ? argv[2] : "%.17g";
  9.     double d = finish / 2.0;
  10.     double f = d;
  11.     int i;
  12.     for (i = 0; i < 54; i++) {
  13.         snprintf(s, 31, format, d);
  14.         assert(strtod(s, NULL) == d);
  15.         printf("%s = %a\n", s, d);
  16.         if (d == finish) break;
  17.         f /= 2; d += f;
  18.     }
  19.     exit(0);
  20. }
  21.  
Success #stdin #stdout 0s 2112KB
comments ()
stdin 
Standard input is empty
stdout 
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
1.99999237060546875 = 0x1.ffff8p+0
1.99999618530273438 = 0x1.ffffcp+0
1.99999809265136719 = 0x1.ffffep+0
1.99999904632568359 = 0x1.fffffp+0
1.9999995231628418 = 0x1.fffff8p+0
1.9999997615814209 = 0x1.fffffcp+0
1.99999988079071045 = 0x1.fffffep+0
1.99999994039535522 = 0x1.ffffffp+0
1.99999997019767761 = 0x1.ffffff8p+0
1.99999998509883881 = 0x1.ffffffcp+0
1.9999999925494194 = 0x1.ffffffep+0
1.9999999962747097 = 0x1.fffffffp+0
1.99999999813735485 = 0x1.fffffff8p+0
1.99999999906867743 = 0x1.fffffffcp+0
1.99999999953433871 = 0x1.fffffffep+0
1.99999999976716936 = 0x1.ffffffffp+0
1.99999999988358468 = 0x1.ffffffff8p+0
1.99999999994179234 = 0x1.ffffffffcp+0
1.99999999997089617 = 0x1.ffffffffep+0
1.99999999998544808 = 0x1.fffffffffp+0
1.99999999999272404 = 0x1.fffffffff8p+0
1.99999999999636202 = 0x1.fffffffffcp+0
1.99999999999818101 = 0x1.fffffffffep+0
1.99999999999909051 = 0x1.ffffffffffp+0
1.99999999999954525 = 0x1.ffffffffff8p+0
1.99999999999977263 = 0x1.ffffffffffcp+0
1.99999999999988631 = 0x1.ffffffffffep+0
1.99999999999994316 = 0x1.fffffffffffp+0
1.99999999999997158 = 0x1.fffffffffff8p+0
1.99999999999998579 = 0x1.fffffffffffcp+0
1.99999999999999289 = 0x1.fffffffffffep+0
1.99999999999999645 = 0x1.ffffffffffffp+0
1.99999999999999822 = 0x1.ffffffffffff8p+0
1.99999999999999911 = 0x1.ffffffffffffcp+0
1.99999999999999956 = 0x1.ffffffffffffep+0
1.99999999999999978 = 0x1.fffffffffffffp+0
2 = 0x1p+1
https://ideone.com/5Dq4ip
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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