Create an app to the following specifications.
- A user can perform these actions:
- Clear - Reset current calculation
- Delete - Removes last typed char (number, operator or decimal)
- Calculate - Evaluate given equation
- Insert number - Enter numbers char 0 - 9
- Insert decimal - Numbers may be decimals
- A user can perform these operations: Add, Subtract, Multiply, Divide
- A user can see the calculation result and perform further calculations on the result 1080x2400
