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  1. const OP_TABLE: [[usize; 10]; 10] = [
  2.     [0, 3, 1, 7, 5, 9, 8, 6, 4, 2],
  3.     [7, 0, 9, 2, 1, 5, 4, 8, 6, 3],
  4.     [4, 2, 0, 6, 8, 7, 1, 3, 5, 9],
  5.     [1, 7, 5, 0, 9, 8, 3, 4, 2, 6],
  6.     [6, 1, 2, 3, 0, 4, 5, 9, 7, 8],
  7.     [3, 6, 7, 4, 2, 0, 9, 5, 8, 1],
  8.     [5, 8, 6, 9, 7, 2, 0, 1, 3, 4],
  9.     [8, 9, 4, 5, 3, 6, 2, 0, 1, 7],
  10.     [9, 4, 3, 8, 6, 1, 7, 2, 0, 5],
  11.     [2, 5, 8, 1, 4, 3, 6, 7, 9, 0]
  12. ];
  13.  
  14. /// Calculates the check digit for a given ID
  15. fn check_digit(input: &[usize]) -> usize {
  16.     let mut interim = 0;
  17.     for &digit in input.iter() {
  18.         interim = OP_TABLE[interim][digit];
  19.     }
  20.     interim
  21. }
  22.  
  23. /// Is an ID valid?
  24. pub fn verify(id: &[usize]) -> bool {
  25.     check_digit(id) == 0
  26. }
  27.  
  28. /// Append a checksum to an existing ID
  29. pub fn id(mut input: Vec<usize>) -> Vec<usize> {
  30.     let id = check_digit(&input);
  31.     input.push(id);
  32.     input
  33. }
  34.  
  35. fn main() {
  36.     let mut id = vec![ 7, 8, 9, 3, 5, 7, 2 ];
  37.     let sum = check_digit(&id);
  38.     id.push(sum);
  39.     //println!("{:?}, {}", id, );
  40.     println!("{}", verify(&id));
  41. }
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