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gists/d-programming/countLettersInTextFile.d

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D

import std.algorithm.iteration : filter;
import std.algorithm.searching : count;
import std.ascii : isAlpha, isWhite;
import std.file : read;
import std.stdio : writefln;
void main()
{
auto fileContent = cast(string)read("file.txt");
auto totalLetters =
count(filter!(a => isAlpha(a) || isWhite(a))(fileContent));
auto percentage = (totalLetters * 100) / cast(double)fileContent.length;
writefln("Percentage of letters: %.0f", percentage);
}