Data commit

Task/Damm-algorithm/Rust/damm-algorithm.rust

@@ -0,0 +1,35 @@
+fn damm(number: &str) -> u8 {
+    static TABLE: [[u8; 10]; 10] = [
+        [0, 3, 1, 7, 5, 9, 8, 6, 4, 2],
+        [7, 0, 9, 2, 1, 5, 4, 8, 6, 3],
+        [4, 2, 0, 6, 8, 7, 1, 3, 5, 9],
+        [1, 7, 5, 0, 9, 8, 3, 4, 2, 6],
+        [6, 1, 2, 3, 0, 4, 5, 9, 7, 8],
+        [3, 6, 7, 4, 2, 0, 9, 5, 8, 1],
+        [5, 8, 6, 9, 7, 2, 0, 1, 3, 4],
+        [8, 9, 4, 5, 3, 6, 2, 0, 1, 7],
+        [9, 4, 3, 8, 6, 1, 7, 2, 0, 5],
+        [2, 5, 8, 1, 4, 3, 6, 7, 9, 0],
+    ];
+
+    number.chars().fold(0, |row, digit| {
+        let digit = digit.to_digit(10).unwrap();
+        TABLE[row as usize][digit as usize]
+    })
+}
+
+fn damm_validate(number: &str) -> bool {
+    damm(number) == 0
+}
+
+fn main() {
+    let numbers = &["5724", "5727", "112946"];
+    for number in numbers {
+        let is_valid = damm_validate(number);
+        if is_valid {
+            println!("{:>6} is valid", number);
+        } else {
+            println!("{:>6} is invalid", number);
+        }
+    }
+}