Posted By

pckujawa on 10/03/08


Tagged

float c bytes double embedded


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Obtaining the byte values in a float or double.


 / Published in: C
 

This routine can be used to copy the byte values of a float or double. The "isBigEndian" variable needs to be determined (most PCs are little-endian, whereas most embedded microprocessors are big-endian). Instead of using unsigned chars, it can be useful to do a "typedef unsigned char UINT8" and simply use UINT8 as the variable type.

  1. float aFloat = anotherFloat; // Could be a double instead
  2. unsigned char bytes[sizeof(float)];
  3. unsigned char *byte = (unsigned char *) &aFloat;
  4.  
  5. if(isBigEndian)
  6. {
  7. for (i=0; i<sizeof(float); i++)
  8. {
  9. bytes[i] = *byte;
  10. byte++;
  11. }
  12. }
  13. else
  14. {
  15. for (i=sizeof(float)-1; i>=0; i--)
  16. {
  17. bytes[i] = *byte;
  18. byte++;
  19. }
  20. }

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