print .2  == .2 ? 'equal' : 'not equal';
equal
print .2 *10 == 2 ? 'equal' : 'not equal';
equal
print .1999999999999999 *10 == 2 ? 'equal' : 'not equal';
not equal
print .19999999999999999 *10 == 2 ? 'equal' : 'not equal';
equal
print .20000000000000001 *10 == 2 ? 'equal' : 'not equal';
equal
print .2000000000000001 *10 == 2 ? 'equal' : 'not equal';
not equal