clc;clear
C1 = input('Please enter a code to break: ' , 's');
if length(C1) ~= 6
disp('Decoy message: Not a six-digit number.');
else
A = mod(sum(C1 - '0'),2);
if A == 1
disp('Decoy message: Sum is odd.')
else
C2 = (C1(1) - '0') * (C1(2) - '0') - (C1(3) - '0');
failed = false;
switch C2
case 1
Day = 'Rescue on Monday';
case 2
Day = 'Rescue on Tuesday';
case 3
Day = 'Rescue on Wednesday';
case 4
Day = 'Rescue on Thursday';
case 5
Day = 'Rescue on Friday';
case 6
Day = 'Rescue on Saturday';
case 7
Day = 'Rescue on Sunday';
otherwise
disp('Decoy message: Invalid rescue day.');
failed = true;
end
F1 = str2double(C1(4));
F2 = str2double(C1(5));
F3 = str2double(C1(6));
if mod(F1,3) == 0
B = F2 - F3;
else
B = F3 - F2;
end
if ~failed
switch(B)
case 1
Position = ' at the bridge.';
case 2
Position = ' at the library.';
case 3
Position = ' at the river crossing.';
case 4
Position = ' at the airport.';
case 5
Position = ' at the bus terminal.';
case 6
Position = ' at the hospital.';
case 7
Position = ' at St. Petes Church.';
otherwise
disp('Decoy message: Invalid rendezvous point.');
end
disp([Day , Position])
end
end
end
