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| author | Dan Ellis <dan.ellis@gmail.com> | 2022-07-12 09:48:38 -0400 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2022-07-26 22:23:47 +1000 |
| commit | f9cbe6bc47dd4f5b8e85178caecd6f0de22b4c34 (patch) | |
| tree | 7e4e3ad1a60aecb364528e609fddb3721fdb5af8 /tests/float/float_format_ftoe.py | |
| parent | b22abcdbbedb0f7583b19031fd65e19b3883671d (diff) | |
| download | micropython-f9cbe6bc47dd4f5b8e85178caecd6f0de22b4c34.tar.gz micropython-f9cbe6bc47dd4f5b8e85178caecd6f0de22b4c34.zip | |
py/formatfloat: Format all whole-number floats exactly.
Formerly, py/formatfloat would print whole numbers inaccurately with
nonzero digits beyond the decimal place. This resulted from its strategy
of successive scaling of the argument by 0.1 which cannot be exactly
represented in floating point. The change in this commit avoids scaling
until the value is smaller than 1, so all whole numbers print with zero
fractional part.
Fixes issue #4212.
Signed-off-by: Dan Ellis dan.ellis@gmail.com
Diffstat (limited to 'tests/float/float_format_ftoe.py')
| -rw-r--r-- | tests/float/float_format_ftoe.py | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/float/float_format_ftoe.py b/tests/float/float_format_ftoe.py new file mode 100644 index 0000000000..bc4e5a4a53 --- /dev/null +++ b/tests/float/float_format_ftoe.py @@ -0,0 +1,4 @@ +# check a case where rounding was suppressed inappropriately when "f" was +# promoted to "e" for large numbers. +v = 8.888e32 +print("%.2f" % v) # '%.2f' format with e32 becomes '%.2e', expect 8.89e+32. |