how can i go back to the fist choose again with out termination after finshing the first task?

 mynumber = input('Enter a number:');
switch  mynumber
    case -1
        disp('negative one');
    case 0
        disp('zero');
    case 1
        disp('positive one');
    otherwise
        disp('other value');

end

hello every one 
I wrote some code which repeatedly do some task
eg like this above which is in mat lab docc.  
when I select the first choice(1}
the program does the first statement only and stops.what i want is ,after compelitilng the first task it  should asks me again if i want to choose the choices starting  from choice 1 
how can i do that?

Answer 1

[David Sanchez]

Use a while-loop:

      mynumber = 0;
       while (mynumber ~= 3)  % condition to get out of the loop. Change to your needs
          mynumber = input('Enter a number:');
          switch mynumber 
              case -1 
                  disp('negative one'); 
              case 0 
                  disp('zero'); 
              case 1 
                  disp('positive one'); 
              otherwise
                  disp('other value');
          end
       end

[Abe Ada]

Thank you David very much.I did not see in that way It works