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Commit db3f011

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Add missing octal conversions (TheAlgorithms#931)
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‎DIRECTORY.md‎

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* Conversions
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* [Binary To Decimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/binary_to_decimal.rs)
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* [Binary To Hexadecimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/binary_to_hexadecimal.rs)
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* [Binary To Octal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/binary_to_octal.rs)
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* [Decimal To Binary](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/decimal_to_binary.rs)
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* [Decimal To Hexadecimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/decimal_to_hexadecimal.rs)
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* [Decimal To Octal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/decimal_to_octal.rs)
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* [Hexadecimal To Binary](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/hexadecimal_to_binary.rs)
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* [Hexadecimal To Decimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/hexadecimal_to_decimal.rs)
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* [Hexadecimal To Octal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/hexadecimal_to_octal.rs)
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* [Length Conversion](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/length_conversion.rs)
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* [Octal To Binary](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_binary.rs)
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* [Octal To Decimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_decimal.rs)
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* [Octal To Hexadecimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_hexadecimal.rs)
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* [Rgb Cmyk Conversion](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/rgb_cmyk_conversion.rs)
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* Data Structures
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* [Avl Tree](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/avl_tree.rs)

‎src/conversions/binary_to_octal.rs‎

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// Author: NithinU2802
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// Binary to Octal Converter: Converts Binary to Octal
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// Wikipedia References:
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// 1. https://en.wikipedia.org/wiki/Binary_number
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// 2. https://en.wikipedia.org/wiki/Octal
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pub fn binary_to_octal(binary_str: &str) -> Result<String, &'static str> {
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// Validate input
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let binary_str = binary_str.trim();
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if binary_str.is_empty() {
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return Err("Empty string");
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}
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if !binary_str.chars().all(|c| c == '0' || c == '1') {
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return Err("Invalid binary string");
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}
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// Pad the binary string with zeros to make its length a multiple of 3
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let padding_length = (3 - (binary_str.len() % 3)) % 3;
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let padded_binary = "0".repeat(padding_length) + binary_str;
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// Convert every 3 binary digits to one octal digit
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let mut octal = String::new();
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for chunk in padded_binary.chars().collect::<Vec<char>>().chunks(3) {
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let binary_group: String = chunk.iter().collect();
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let decimal = u8::from_str_radix(&binary_group, 2).map_err(|_| "Conversion error")?;
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octal.push_str(&decimal.to_string());
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}
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Ok(octal)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_binary_to_octal() {
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assert_eq!(binary_to_octal("1010"), Ok("12".to_string()));
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assert_eq!(binary_to_octal("1111"), Ok("17".to_string()));
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assert_eq!(binary_to_octal("11111111"), Ok("377".to_string()));
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assert_eq!(binary_to_octal("1100100"), Ok("144".to_string()));
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}
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#[test]
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fn test_invalid_input() {
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assert_eq!(binary_to_octal(""), Err("Empty string"));
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assert_eq!(binary_to_octal("12"), Err("Invalid binary string"));
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assert_eq!(binary_to_octal("abc"), Err("Invalid binary string"));
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}
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}

‎src/conversions/decimal_to_octal.rs‎

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// Author: NithinU2802
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// Decimal to Octal Converter: Converts Decimal to Octal
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// Wikipedia References:
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// 1. https://en.wikipedia.org/wiki/Decimal
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// 2. https://en.wikipedia.org/wiki/Octal
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pub fn decimal_to_octal(decimal_num: u64) -> String {
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if decimal_num == 0 {
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return "0".to_string();
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}
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let mut num = decimal_num;
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let mut octal = String::new();
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while num > 0 {
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let remainder = num % 8;
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octal.push_str(&remainder.to_string());
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num /= 8;
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}
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// Reverse the string to get the correct octal representation
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octal.chars().rev().collect()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_decimal_to_octal() {
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assert_eq!(decimal_to_octal(8), "10");
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assert_eq!(decimal_to_octal(15), "17");
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assert_eq!(decimal_to_octal(255), "377");
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assert_eq!(decimal_to_octal(100), "144");
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assert_eq!(decimal_to_octal(0), "0");
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}
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}
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// Author: NithinU2802
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// Hexadecimal to Octal Converter: Converts Hexadecimal to Octal
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// Wikipedia References:
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// 1. https://en.wikipedia.org/wiki/Hexadecimal
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// 2. https://en.wikipedia.org/wiki/Octal
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pub fn hexadecimal_to_octal(hex_str: &str) -> Result<String, &'static str> {
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let hex_str = hex_str.trim();
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if hex_str.is_empty() {
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return Err("Empty string");
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}
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// Validate hexadecimal string
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if !hex_str.chars().all(|c| c.is_ascii_hexdigit()) {
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return Err("Invalid hexadecimal string");
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}
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// Convert hex to decimal first
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let decimal = u64::from_str_radix(hex_str, 16).map_err(|_| "Conversion error")?;
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// Then convert decimal to octal
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if decimal == 0 {
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return Ok("0".to_string());
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}
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let mut num = decimal;
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let mut octal = String::new();
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while num > 0 {
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let remainder = num % 8;
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octal.push_str(&remainder.to_string());
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num /= 8;
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}
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// Reverse the string to get the correct octal representation
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Ok(octal.chars().rev().collect())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_hexadecimal_to_octal() {
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assert_eq!(hexadecimal_to_octal("A"), Ok("12".to_string()));
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assert_eq!(hexadecimal_to_octal("FF"), Ok("377".to_string()));
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assert_eq!(hexadecimal_to_octal("64"), Ok("144".to_string()));
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assert_eq!(hexadecimal_to_octal("0"), Ok("0".to_string()));
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}
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#[test]
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fn test_invalid_input() {
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assert_eq!(hexadecimal_to_octal(""), Err("Empty string"));
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assert_eq!(
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hexadecimal_to_octal("GG"),
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Err("Invalid hexadecimal string")
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);
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assert_eq!(
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hexadecimal_to_octal("XYZ"),
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Err("Invalid hexadecimal string")
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);
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}
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}

‎src/conversions/mod.rs‎

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mod binary_to_decimal;
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mod binary_to_hexadecimal;
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mod binary_to_octal;
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mod decimal_to_binary;
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mod decimal_to_hexadecimal;
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mod decimal_to_octal;
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mod hexadecimal_to_binary;
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mod hexadecimal_to_decimal;
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mod hexadecimal_to_octal;
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mod length_conversion;
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mod octal_to_binary;
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mod octal_to_decimal;
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mod octal_to_hexadecimal;
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mod rgb_cmyk_conversion;
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pub use self::binary_to_decimal::binary_to_decimal;
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pub use self::binary_to_hexadecimal::binary_to_hexadecimal;
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pub use self::binary_to_octal::binary_to_octal;
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pub use self::decimal_to_binary::decimal_to_binary;
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pub use self::decimal_to_hexadecimal::decimal_to_hexadecimal;
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pub use self::decimal_to_octal::decimal_to_octal;
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pub use self::hexadecimal_to_binary::hexadecimal_to_binary;
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pub use self::hexadecimal_to_decimal::hexadecimal_to_decimal;
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pub use self::hexadecimal_to_octal::hexadecimal_to_octal;
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pub use self::length_conversion::length_conversion;
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pub use self::octal_to_binary::octal_to_binary;
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pub use self::octal_to_decimal::octal_to_decimal;
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pub use self::octal_to_hexadecimal::octal_to_hexadecimal;
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pub use self::rgb_cmyk_conversion::rgb_to_cmyk;
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// Author: NithinU2802
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// Octal to Hexadecimal Converter: Converts Octal to Hexadecimal
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// Wikipedia References:
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// 1. https://en.wikipedia.org/wiki/Octal
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// 2. https://en.wikipedia.org/wiki/Hexadecimal
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pub fn octal_to_hexadecimal(octal_str: &str) -> Result<String, &'static str> {
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let octal_str = octal_str.trim();
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if octal_str.is_empty() {
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return Err("Empty string");
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}
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// Validate octal string
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if !octal_str.chars().all(|c| ('0'..='7').contains(&c)) {
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return Err("Invalid octal string");
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}
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// Convert octal to decimal first
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let decimal = u64::from_str_radix(octal_str, 8).map_err(|_| "Conversion error")?;
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// Special case for zero
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if decimal == 0 {
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return Ok("0".to_string());
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}
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// Convert decimal to hexadecimal
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Ok(format!("{decimal:X}"))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_octal_to_hexadecimal() {
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assert_eq!(octal_to_hexadecimal("12"), Ok("A".to_string()));
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assert_eq!(octal_to_hexadecimal("377"), Ok("FF".to_string()));
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assert_eq!(octal_to_hexadecimal("144"), Ok("64".to_string()));
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assert_eq!(octal_to_hexadecimal("0"), Ok("0".to_string()));
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}
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#[test]
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fn test_invalid_input() {
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assert_eq!(octal_to_hexadecimal(""), Err("Empty string"));
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assert_eq!(octal_to_hexadecimal("8"), Err("Invalid octal string"));
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assert_eq!(octal_to_hexadecimal("9"), Err("Invalid octal string"));
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assert_eq!(octal_to_hexadecimal("ABC"), Err("Invalid octal string"));
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}
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}

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