how to remain in the loop until the user gives the specific command?

I want to run a loop with having some instruction after those instruction it should ask weather to remain in the loop or exit the loop. how can i implement this ?

Answer 1

[Walter Roberson]

while true
  fprintf('Watch the chicken cross the road!\n');
  YN = input('Do you know why yet? Y or N', 's');
  if strcmpi(YN, 'y')
    break;
  end
  for K = 1 : randi(3)
    fprintf('Cluck! ');
  end
  fprintf('\n');
end
fprintf('Bawk!\n');