Add Hexadecimal To Decimal Conversion (TheAlgorithms#657)

Author: Adin3

DIRECTORY.md

@@ -44,6 +44,7 @@
  * [Decimal To Binary](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/decimal_to_binary.rs)
  * [Decimal To Hexadecimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/decimal_to_hexadecimal.rs)
  * [Hexadecimal To Binary](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/hexadecimal_to_binary.rs)
+ * [Hexadecimal To Decimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/hexadecimal_to_decimal.rs)
  * [Octal To Binary](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_binary.rs)
  * [Octal To Decimal](https://github.com/TheAlgorithms/Rust/blob/master/src/conversions/octal_to_decimal.rs)
  * Data Structures

src/conversions/hexadecimal_to_decimal.rs

@@ -0,0 +1,61 @@
+pub fn hexadecimal_to_decimal(hexadecimal_str: &str) -> Result<u64, &'static str> {
+ if hexadecimal_str.is_empty() {
+ return Err("Empty input");
+ }
+
+ for hexadecimal_str in hexadecimal_str.chars() {
+ if !hexadecimal_str.is_ascii_hexdigit() {
+ return Err("Input was not a hexadecimal number");
+ }
+ }
+
+ match u64::from_str_radix(hexadecimal_str, 16) {
+ Ok(decimal) => Ok(decimal),
+ Err(_e) => Err("Failed to convert octal to hexadecimal"),
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_hexadecimal_to_decimal_empty() {
+ assert_eq!(hexadecimal_to_decimal(""), Err("Empty input"));
+ }
+
+ #[test]
+ fn test_hexadecimal_to_decimal_invalid() {
+ assert_eq!(
+ hexadecimal_to_decimal("xyz"),
+ Err("Input was not a hexadecimal number")
+ );
+ assert_eq!(
+ hexadecimal_to_decimal("0xabc"),
+ Err("Input was not a hexadecimal number")
+ );
+ }
+
+ #[test]
+ fn test_hexadecimal_to_decimal_valid1() {
+ assert_eq!(hexadecimal_to_decimal("45"), Ok(69));
+ assert_eq!(hexadecimal_to_decimal("2b3"), Ok(691));
+ assert_eq!(hexadecimal_to_decimal("4d2"), Ok(1234));
+ assert_eq!(hexadecimal_to_decimal("1267a"), Ok(75386));
+ }
+
+ #[test]
+ fn test_hexadecimal_to_decimal_valid2() {
+ assert_eq!(hexadecimal_to_decimal("1a"), Ok(26));
+ assert_eq!(hexadecimal_to_decimal("ff"), Ok(255));
+ assert_eq!(hexadecimal_to_decimal("a1b"), Ok(2587));
+ assert_eq!(hexadecimal_to_decimal("7fffffff"), Ok(2147483647));
+ }
+
+ #[test]
+ fn test_hexadecimal_to_decimal_valid3() {
+ assert_eq!(hexadecimal_to_decimal("0"), Ok(0));
+ assert_eq!(hexadecimal_to_decimal("7f"), Ok(127));
+ assert_eq!(hexadecimal_to_decimal("80000000"), Ok(2147483648));
+ }
+}

src/conversions/mod.rs

@@ -3,12 +3,14 @@ mod binary_to_hexadecimal;
 mod decimal_to_binary;
 mod decimal_to_hexadecimal;
 mod hexadecimal_to_binary;
+mod hexadecimal_to_decimal;
 mod octal_to_binary;
 mod octal_to_decimal;
 pub use self::binary_to_decimal::binary_to_decimal;
 pub use self::binary_to_hexadecimal::binary_to_hexadecimal;
 pub use self::decimal_to_binary::decimal_to_binary;
 pub use self::decimal_to_hexadecimal::decimal_to_hexadecimal;
 pub use self::hexadecimal_to_binary::hexadecimal_to_binary;
+pub use self::hexadecimal_to_decimal::hexadecimal_to_decimal;
 pub use self::octal_to_binary::octal_to_binary;
 pub use self::octal_to_decimal::octal_to_decimal;

src/sorting/bingo_sort.rs

@@ -8,7 +8,7 @@ fn max_min(vec: &[i32], bingo: &mut i32, next_bingo: &mut i32) {
  }
 }
 
-pub fn bingo_sort(vec: &mut Vec<i32>) {
+pub fn bingo_sort(vec: &mut [i32]) {
  if vec.is_empty() {
  return;
  }