[RUST/COMMON] 시저 암호(Caesar cipher) 만들기 (클로저 사용)

icodebroker COMMON 2024-06-18

■ 클로저를 사용해 시저 암호(Caesar cipher)를 만드는 방법을 보여준다.

▶ 예제 코드 (RS)


fn encrypt(text : &str, shift : i16) -> String
{
    let a_code    = 'A' as i16;
    let converter = |character| (((character + a_code + shift + 26) % 26 + a_code) as u8) as char;
    let is_alpha  = |character| 'A' <= character && character <= 'Z';

    text.chars()
        .map(|character| if is_alpha(character) { converter(character as i16) } else { character })
        .collect()
}

fn main()
{
    let encrypted = encrypt("I LOVE YOU.",  3);
    let decrypted = encrypt(&encrypted   , -3);

    println!("{} => {}", encrypted, decrypted);
}

/*
L ORYH UXVW. => I LOVE RUST.
*/

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fn encrypt(text : &str, shift : i16) -> String

{

let a_code = 'A' as i16;

let converter = |character| (((character + a_code + shift + 26) % 26 + a_code) as u8) as char;

let is_alpha = |character| 'A' <= character && character <= 'Z';

text.chars()

.map(|character| if is_alpha(character) { converter(character as i16) } else { character })

.collect()

}

fn main()

{

let encrypted = encrypt("I LOVE YOU.", 3);

let decrypted = encrypt(&encrypted , -3);

println!("{} => {}", encrypted, decrypted);

}

/*

L ORYH UXVW. => I LOVE RUST.

*/