1 . All the basic math (Add,Sub,Mul,Div,Pow,Inv..).
2 . You can not perform multiple operation in one go as of now.
3 . You can use the result of one operation to perform other operation.
1 . As of now the input from keyboard is disabled, You can use mouse key to press numbers and operation on calculator UI.
1 . Enabling multiple operation in one go (May be a hint to use postfix and stack calculation).
2 . Enabling history option.
3 . Enabling converter option.
4 . Enabling Scientific calculations.