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Hickerson series of almost integers: Difference between revisions
Add Rust implementation
(→{{header|Phix}}: replaced with gmp version) |
(Add Rust implementation) |
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Line 2,182:
n: 16 h: 5315654681981354.51307674 NOT nearly integer
n: 17 h: 130370767029135900.457985 NOT nearly integer</pre>
=={{header|Rust}}==
<lang rust>
use decimal::d128;
use factorial::Factorial;
fn hickerson(n: u64) -> d128 {
d128::from(n.factorial()) / (d128!(2) * (d128!(2).ln().pow(d128::from(n + 1))))
}
// Some details on floating-points numbers can be found at https://cheats.rs/#basic-types
fn main() {
for i in 1..18 {
let h = hickerson(i);
let string = h.to_string();
let dec_part = string.split('.').nth(1).unwrap();
if dec_part.starts_with('0') || dec_part.starts_with('9') {
println!("{} is an almost integer.", h);
} else {
println!("{} is not an almost integer.", h);
}
}
}
</lang>
{{out}}
<pre>
1.040684490502803898934790801867496 is an almost integer.
3.002780707156905443499767407219304 is an almost integer.
12.99629050527696646222488454296431 is an almost integer.
74.99873544766160012763455037564470 is an almost integer.
541.0015185164235075692027746182565 is an almost integer.
4683.001247262257437180467152479008 is an almost integer.
47292.99873131462390482283548778628 is an almost integer.
545834.9979074851670672910397944921 is an almost integer.
7087261.001622899120979187515908217 is an almost integer.
102247563.0052710420110883885941994 is an almost integer.
1622632572.997550049852874861078498 is an almost integer.
28091567594.98157244071518917609951 is an almost integer.
526858348381.0012482861804893808360 is an almost integer.
10641342970443.08453192709507015038 is an almost integer.
230283190977853.0374360391259771066 is an almost integer.
5315654681981354.513076743456805575 is not an almost integer.
130370767029135900.4579853491967735 is not an almost integer.
</pre>
=={{header|Scala}}==
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