Semordnilap: Difference between revisions

=={{header|Rust}}==

{{trans|Java}}

<lang rust>use std::collections::HashSet;

use std::fs::File;

use std::io::{self, BufRead};

use std::iter::FromIterator;

fn semordnilap(filename: &str) -> std::io::Result<()> {

let file = File::open(filename)?;

let mut seen = HashSet::new();

let mut count = 0;

for line in io::BufReader::new(file).lines() {

let mut word = line?;

word.make_ascii_lowercase();

let rev = String::from_iter(word.chars().rev());

if seen.contains(&rev) {

if count < 5 {

println!("{}\t{}", word, rev);

}

count += 1;

} else {

seen.insert(word);

}

}

println!("\nSemordnilap pairs found: {}", count);

Ok(())

}

fn main() {

match semordnilap("unixdict.txt") {

Ok(()) => {}

Err(error) => eprintln!("{}", error)

}

}</lang>

{{out}}

<pre>

ca ac

dab bad

diva avid

dna and

drab bard

Semordnilap pairs found: 158

</pre>