clear all;close all;clc;

% Test the function with the provided numbers
numbers = [5724, 5727, 112946];
for i = 1:length(numbers)
    if checkdigit(numbers(i))
        fprintf('%d validates as: true\n', numbers(i));
    else
        fprintf('%d validates as: false\n', numbers(i));
    end
end

function isValid = checkdigit(n)
    matrix = [
        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
    ];

    row = 0;
    nString = num2str(n);
    for i = 1:length(nString)
        d = str2double(nString(i));
        row = matrix(row+1, d + 1);
    end
    isValid = (row == 0);
end