If you have compiler warnings enabled you will get a warning for those mistakes in the if structures. Go to File, Preferences and enable All compiler warnings.
warning: suggest parentheses around assignment used as truth value [-Wparentheses]
if (rotationDir = 1) lcd.print("CCW");
~~~~~~~~~~^
: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
else if (rotationDir = -1) lcd.print("CW");
You should pay attention to all warnings and try to resolve them. They are not harmless.