while 1
volt=input('Enter Voltage...\n');
if volt>=100
    str=['this voltage ever ' int2str(100)];
    disp(str);
elseif (volt<100 & volt>50)
    fprintf('Voltage is normal %f\n',volt);
else
    fprintf('voltage is low %4.0f\n',50);
end
fprintf('\n');
end

%press ctrl+c to end this program