Calculator

Let us create a program that will calculate mathematical expressions of the following type: 2.34 * 5 / ( 56 + 7 ). It will work with both real and whole numbers. Besides, let us make it work with additional variables. For example, in case with 3.1415 * a * a, we will have to change only the value of a to calculate the area of the circle with the corresponding radius. Another useful feature of the calculator will be displaying the result in the decimal and hexadecimal forms simultaneously.

Day 1	Creating and linking dialog resources
Day 2	Calculating an expression and displaying the result
Day 3	Linking variable
Day 4	Saving data. The calculator is ready.