37 lines
864 B
D
37 lines
864 B
D
import std.stdio;
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auto table = [
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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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bool damm(string s) {
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int interim = 0;
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foreach (c; s) {
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interim = table[interim][c - '0'];
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}
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return interim == 0;
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}
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void main() {
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import std.conv : to;
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auto numbers = [5724, 5727, 112946, 112949];
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foreach (number; numbers) {
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bool isValid = damm(number.to!string());
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writef("%6d is ", number);
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if (isValid) {
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writeln("valid");
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} else {
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writeln("invalid");
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}
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}
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}
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