6f4d424f46
Rework the conversion of floats to decimal strings so it aligns precisely with the conversion of strings to floats in parsenum.c. This is to avoid rendering 1eX as 9.99999eX-1 etc. This is achieved by removing the power- of-10 tables and using pow() to compute the exponent directly, and that's done efficiently by first estimating the power-of-10 exponent from the power-of-2 exponent in the floating-point representation. Code size is reduced by roughly 100 to 200 bytes by this commit. Signed-off-by: Dan Ellis <dan.ellis@gmail.com>
53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
print("%s" % 1.0)
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print("%r" % 1.0)
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print("%d" % 1.0)
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print("%i" % 1.0)
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print("%u" % 1.0)
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# these 3 have different behaviour in Python 3.x versions
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# uPy raises a TypeError, following Python 3.5 (earlier versions don't)
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# print("%x" % 18.0)
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# print("%o" % 18.0)
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# print("%X" % 18.0)
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print("%e" % 1.23456)
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print("%E" % 1.23456)
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print("%f" % 1.23456)
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print("%F" % 1.23456)
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print("%g" % 1.23456)
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print("%G" % 1.23456)
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print("%06e" % float("inf"))
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print("%06e" % float("-inf"))
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print("%06e" % float("nan"))
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print("%02.3d" % 123) # prec > width
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print("%+f %+f" % (1.23, -1.23)) # float sign
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print("% f % f" % (1.23, -1.23)) # float space sign
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print("%0f" % -1.23) # negative number with 0 padding
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# numbers with large negative exponents
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print("%f" % 1e-10)
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print("%f" % 1e-20)
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print("%f" % 1e-50)
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print("%f" % 1e-100)
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print("%f" % 1e-300)
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# large decimal precision should be truncated and not overflow buffer
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# the output depends on the FP calculation so only first 2 digits are printed
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# (the 'g' with small e are printed using 'f' style, so need to be checked)
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print(("%.40f" % 1e-300)[:2])
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print(("%.40g" % 1e-1)[:2])
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print(("%.40g" % 1e-2)[:2])
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print(("%.40g" % 1e-3)[:2])
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# Under Appveyor Release builds, 1e-4 was being formatted as 9.99999...e-5
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# instead of 0.0001. (Interestingly, it formatted correctly for the Debug
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# build). Avoid the edge case.
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print(("%.40g" % 1.1e-4)[:2])
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print("%.0g" % 1) # 0 precision 'g'
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print("%.1e" % 9.99) # round up with positive exponent
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print("%.1e" % 0.999) # round up with negative exponent
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