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  1. #include <limits.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4. #include <math.h>
  5. #include <float.h>
  6.  
  7. void PrintDoubleAsCBytes(double d, FILE* f)
  8. {
  9.   unsigned char a[sizeof(d)];
  10.   unsigned i;
  11.   memcpy(a, &d, sizeof(d));
  12.   for (i = 0; i < sizeof(a); i++)
  13.     fprintf(f, "%0*X ", (CHAR_BIT + 3) / 4, a[i]);
  14. }
  15.  
  16. int main(void)
  17. {
  18.   PrintDoubleAsCBytes(0.0, stdout); puts("");
  19.   PrintDoubleAsCBytes(0.5, stdout); puts("");
  20.   PrintDoubleAsCBytes(1.0, stdout); puts("");
  21.   PrintDoubleAsCBytes(2.0, stdout); puts("");
  22.   PrintDoubleAsCBytes(-2.0, stdout); puts("");
  23.   PrintDoubleAsCBytes(DBL_MIN, stdout); puts("");
  24.   PrintDoubleAsCBytes(DBL_MAX, stdout); puts("");
  25.   PrintDoubleAsCBytes(INFINITY, stdout); puts("");
  26. #ifdef NAN
  27.   PrintDoubleAsCBytes(NAN, stdout); puts("");
  28. #endif
  29.   return 0;
  30. }
  31.  
Success #stdin #stdout 0s 1788KB
comments (?)
stdin
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Standard input is empty
stdout
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00 00 00 00 00 00 00 00 
00 00 00 00 00 00 E0 3F 
00 00 00 00 00 00 F0 3F 
00 00 00 00 00 00 00 40 
00 00 00 00 00 00 00 C0 
00 00 00 00 00 00 10 00 
FF FF FF FF FF FF EF 7F 
00 00 00 00 00 00 F0 7F 
00 00 00 00 00 00 F8 7F
https://ideone.com/mTSw1O
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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