printf rounding behavior for doubles

by

It’s “round half to even” or “Banker’s rounding”. The last digit of the rounded representation is chosen to be even if the number is exactly half way between the two.

http://linuxgazette.net/144/misc/lg/a_question_of_rounding_in_issue_143.html:
“For the GNU C library, the rounding rule used by printf() is “bankers rounding” or “round to even”. This is more correct than some other C libraries, as the C99 specification says that conversion to decimal should use the currently selected IEEE rounding mode (default bankers rounding).”

More Related Contents:

  1. round() for float in C++
  2. Why does printf() promote a float to a double?
  3. C++: How to round a double to an int? [duplicate]
  4. Why is printf round floating point numbers up?
  5. Set back default floating point print precision in C++
  6. Extra leading zeros when printing float using printf?
  7. Please provide me the logic to print the result using PRINTF [closed]
  8. Random float number generation
  9. What is the difference between float and double?
  10. long double vs double
  11. What is a subnormal floating point number?
  12. Floating point format for std::ostream
  13. Change floating point rounding mode
  14. Emulate “double” using 2 “float”s
  15. Why did Microsoft abandon long double data type? [closed]
  16. What happens to a float variable when %d is used in a printf?
  17. warning: format not a string literal and no format arguments
  18. How to detect double precision floating point overflow and underflow?
  19. Compare two float variables in C++
  20. A fast method to round a double to a 32-bit int explained
  21. How does printf and co differentiate between float and double
  22. Efficient way to round double precision numbers to a lower precision given in number of bits
  23. Floating point Endianness?
  24. Matlab vs C++ Double Precision
  25. C floating point precision [duplicate]
  26. Why do sin(45) and cos(45) give different results? [duplicate]
  27. Printing double without losing precision
  28. How is floating point conversion actually done in C++?(double to float or float to double)
  29. How to force GCC to assume that a floating-point expression is non-negative?
  30. Is there any advantage to using pow(x,2) instead of x*x, with x double?

Leave a Comment