Merge pull request #1068 from dhalbert/micropython-25ae98f-merge

Micropython 25ae98f merge

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/float/float_parse.py b/tests/float/float_parse.py
new file mode 100644
index 000000000..4b026de1c
--- /dev/null
+++ b/tests/float/float_parse.py
@@ -0,0 +1,32 @@
+# test parsing of floats
+
+inf = float('inf')
+
+# it shouldn't matter where the decimal point is if the exponent balances the value
+print(float('1234') - float('0.1234e4'))
+print(float('1.015625') - float('1015625e-6'))
+
+# very large integer part with a very negative exponent should cancel out
+print('%.4e' % float('9' * 60 + 'e-60'))
+print('%.4e' % float('9' * 60 + 'e-40'))
+
+# many fractional digits
+print(float('.' + '9' * 70))
+print(float('.' + '9' * 70 + 'e20'))
+print(float('.' + '9' * 70 + 'e-50') == float('1e-50'))
+
+# tiny fraction with large exponent
+print(float('.' + '0' * 60 + '1e10') == float('1e-51'))
+print(float('.' + '0' * 60 + '9e25') == float('9e-36'))
+print(float('.' + '0' * 60 + '9e40') == float('9e-21'))
+
+# ensure that accuracy is retained when value is close to a subnormal
+print(float('1.00000000000000000000e-37'))
+print(float('10.0000000000000000000e-38'))
+print(float('100.000000000000000000e-39'))
+
+# very large exponent literal
+print(float('1e4294967301'))
+print(float('1e-4294967301'))
+print(float('1e18446744073709551621'))
+print(float('1e-18446744073709551621'))