e112.java:37: bad assignment: result of method Number.-= cannot be cast to double
e112.java:39: bad assignment: result of method Number.-= cannot be cast to double
e112.java:40: bad assignment: result of method Number.-= cannot be cast to double
e112.java:41: bad assignment: result of method Number.-= cannot be cast to double
e112.java:43: bad assignment: result of method Number.-= cannot be cast to double