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Diffstat (limited to 'tests/float/float_format_ints_doubleprec.py')
| -rw-r--r-- | tests/float/float_format_ints_doubleprec.py | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tests/float/float_format_ints_doubleprec.py b/tests/float/float_format_ints_doubleprec.py new file mode 100644 index 0000000000..57899d6d65 --- /dev/null +++ b/tests/float/float_format_ints_doubleprec.py @@ -0,0 +1,15 @@ +# Test formatting of very large ints. +# Relies on double-precision floats. + +import array +import sys + +# Challenging way to express 1e200 and 1e100. +print("{:.12e}".format(float("9" * 400 + "e-200"))) +print("{:.12e}".format(float("9" * 400 + "e-300"))) + +# These correspond to the binary representation of 1e200 in float64s: +v1 = 0x54B249AD2594C37D # 1e100 +v2 = 0x6974E718D7D7625A # 1e200 +print("{:.12e}".format(array.array("d", v1.to_bytes(8, sys.byteorder))[0])) +print("{:.12e}".format(array.array("d", v2.to_bytes(8, sys.byteorder))[0])) |