1# test parsing of floats
2
3inf = float("inf")
4
5# it shouldn't matter where the decimal point is if the exponent balances the value
6print(float("1234") - float("0.1234e4"))
7print(float("1.015625") - float("1015625e-6"))
8
9# very large integer part with a very negative exponent should cancel out
10print("%.4e" % float("9" * 60 + "e-60"))
11print("%.4e" % float("9" * 60 + "e-40"))
12
13# many fractional digits
14print(float("." + "9" * 70))
15print(float("." + "9" * 70 + "e20"))
16print(float("." + "9" * 70 + "e-50") == float("1e-50"))
17
18# tiny fraction with large exponent
19print(float("." + "0" * 60 + "1e10") == float("1e-51"))
20print(float("." + "0" * 60 + "9e25") == float("9e-36"))
21print(float("." + "0" * 60 + "9e40") == float("9e-21"))
22
23# ensure that accuracy is retained when value is close to a subnormal
24print(float("1.00000000000000000000e-37"))
25print(float("10.0000000000000000000e-38"))
26print(float("100.000000000000000000e-39"))
27
28# very large exponent literal
29print(float("1e4294967301"))
30print(float("1e-4294967301"))
31print(float("1e18446744073709551621"))
32print(float("1e-18446744073709551621"))
33
34# check small decimals are as close to their true value as possible
35for n in range(1, 10):
36    print(float("0.%u" % n) == n / 10)
37