Created
March 26, 2023 20:09
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#![allow(non_snake_case)] | |
mod Caesar { | |
pub fn encrypt(string: String, n: i32) -> String { | |
let n = n % 26; | |
let mut res = String::new(); | |
for char in string.as_bytes() { | |
if !char.is_ascii_alphabetic() || char.is_ascii_whitespace() { | |
res.push(char::from_u32(*char as u32).unwrap()); | |
continue; | |
}; | |
if (char.is_ascii_lowercase() && *char as u32 + n as u32 >= b'z' as u32) | |
|| (char.is_ascii_uppercase() && *char as u32 + n as u32 >= b'Z' as u32) | |
{ | |
res.push( | |
std::char::from_u32( | |
if char.is_ascii_lowercase() { | |
b'a' | |
} else { | |
b'A' | |
} as u32 | |
+ n as u32 | |
- (if char.is_ascii_lowercase() { | |
b'z' | |
} else { | |
b'Z' | |
} - *char) as u32 - 1, | |
) | |
.unwrap(), | |
); | |
continue; | |
} | |
res.push(std::char::from_u32(*char as u32 + n as u32).unwrap()); | |
} | |
res | |
} | |
pub fn decrypt(string: String, n: i32) -> String { | |
let n = n % 26; | |
let mut res = String::new(); | |
for char in string.as_bytes() { | |
if !char.is_ascii_alphabetic() || char.is_ascii_whitespace() { | |
res.push(char::from_u32(*char as u32).unwrap()); | |
continue; | |
}; | |
if (char.is_ascii_lowercase() && (*char as u32 - n as u32) < b'a' as u32) | |
|| (char.is_ascii_uppercase() && (*char as u32 - n as u32) < b'A' as u32) | |
{ | |
res.push( | |
std::char::from_u32( | |
(if char.is_ascii_lowercase() { | |
b'z' | |
} else { | |
b'Z' | |
} as u32 | |
- (n as u32 | |
- (*char as u32 | |
- (if char.is_ascii_lowercase() { | |
b'a' | |
} else { | |
b'A' | |
}) as u32))) + 1, | |
) | |
.unwrap(), | |
); | |
continue; | |
} | |
res.push(std::char::from_u32(*char as u32 - n as u32).unwrap()); | |
} | |
res | |
} | |
} | |
fn main() { | |
let encrypted = Caesar::encrypt(String::from("Hello, Worz! Encode and decode"), 7); | |
let decrypted = Caesar::decrypt(encrypted.clone(), 7); | |
println!("{encrypted} -> {decrypted}"); | |
} |
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