function test(a, b)
  s1 = num2str(a);
  s2 = num2str(b);
  disp(strcat(s1, " and ", s2, " = ", num2str(a&&b)));
  disp(strcat(s1, " or ", s2, " = ", num2str(a||b)));
  disp(strcat("not ", s1, " = ", num2str(!a)));
endfunction

% constant true is 1, false is 0
test(true, true);
test(false, false);
test(true, false);
test(false, true);