py/formatfloat: Fix number of digits and exponent sign when rounding.
This patch fixes 2 things when printing a floating-point number that requires rounding up of the mantissa: - retain the correct precision; eg 0.99 becomes 1.0, not 1.00 - if the exponent goes from -1 to 0 then render it as +0, not -0
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@ -376,11 +376,16 @@ int mp_format_float(FPTYPE f, char *buf, size_t buf_size, char fmt, int prec, ch
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rs[1] = '0';
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if (e_sign == '-') {
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e--;
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if (e == 0) {
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e_sign = '+';
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}
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} else {
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e++;
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}
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} else {
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// Need at extra digit at the end to make room for the leading '1'
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s++;
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}
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s++;
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char *ss = s;
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while (ss > rs) {
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*ss = ss[-1];
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@ -44,3 +44,6 @@ print(('%.40g' % 1e-3)[:2])
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print(('%.40g' % 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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@ -1,4 +1,3 @@
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# uPy and CPython outputs differ for the following
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print("%.1g" % -9.9) # round up 'g' with '-' sign
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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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print("%.2g" % 99.9) # round up
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@ -1,3 +1,2 @@
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-10
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1.00e+01
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1.00e-00
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100
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