DecoderSwitch

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Course: ENCMP 100
% Assignment: 2
% Name:
% CCID:
% U of A ID:
%
% Acknowledgements:
% I refered to the MatLab documentation while writing.
%
% Description:
% This program is meant to decode a secret code according to rules outlined
% in the project description.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clc;
clear;
code = int2str(input("Please enter a code to break: "));
intArr = (1:9);
if(length(code) == 9)  %%Test for correct code length
    sum = 0;
    for x = 1:length(code)  %%Put the code into an integer array
        intArr(x) = str2double(code(x));
    end
    for i = 1:length(intArr)  %%Sum all digits of the code
        sum = sum + intArr(i);
    end
    if(2*int8(sum / 2) == sum)  %% Test for even code
        day = intArr(1)*intArr(3) - intArr(5);
        sDay = '';
        switch day
            case 1
                sDay = 'Monday';
            case 2
                sDay = 'Tuesday';
            case 3
                sDay = 'Wednesday';
            case 4
                sDay = 'Thursday';
            case 5
                sDay = 'Friday';
            case 6
                sDay = 'Saturday';
            case 7
                sDay = 'Sunday';
            otherwise
                disp("Decoy message: Invalid rescue day.");
                return;
        end


            if(rem(intArr(2)*intArr(4)-intArr(6), 3) == 0)  %%If divisible by 3
                loc = intArr(7) - intArr(9);
            else
                loc = intArr(8) - intArr(9);
            end
            sLoc = '';
            switch loc
                case 1
                    sLoc = 'the bridge.';
                case 2
                    sLoc = 'the library.';
                case 3
                    sLoc = 'the river crossing.';
                case 4
                    sLoc = 'the airport.';
                case 5
                    sLoc = 'the bus terminal.';
                case 6
                    sLoc = 'the hospital.'
                case 7
                    sLoc = 'St. Petes Church.';
                otherwise
                    disp("Decoy message: Invalid rendezvous point.");
                    return;
            end
            disp("Rescue on " + sDay + " at " + sLoc);
                    else
        disp("Decoy message: Sum is odd.");
    end
else
    disp("Decoy message: Not a nine-digit number.");
end