%Application Project: Hill Substitution Ciphers

ex = input('Exercise number (2, 3, 4, 5, 6)? ');
       
if ex==2
   A=[3 10 20; 20 9 17; 9 4 17]
   
elseif ex==3
   A=[3 10 20; 20 9 17; 9 4 17]
elseif ex==4
   A=[11 20 20; 2 1 24; 9 3 3]
   B=[2 5 0; 22 9 4; 17 21 8]
   C=[3 1 24; 20 11 25; 12 4 19]
elseif ex==5
   B=[4 9 15; 15 17 6; 24 0 17]
elseif ex==6
   A=[11 20 20; 2 1 24; 9 3 3]
     
else
   disp('No data for this exercise for this Application Project.') 
end