Entropy/Narcissist: Difference between revisions

=={{header|Nim}}==

<lang Nim>import os, math, strutils, tables

let execName = getAppFilename().splitPath().tail

let srcName = execName & ".nim"

func entropy(str: string): float =

var counts: CountTable[char]

for ch in str:

counts.inc(ch)

for count in counts.values:

result -= count / str.len * log2(count / str.len)

echo "Source file entropy: ", srcName.readFile().entropy().formatFloat(ffDecimal, 5)

echo "Binary file entropy: ", execName.readFile().entropy().formatFloat(ffDecimal, 5)</lang>

{{out}}

<pre>Source file entropy: 4.75555

Binary file entropy: 5.97036</pre>