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