Complete the calculator that retums the result on the text part once you enter an equation. For example, if you enter ' 117,3,=, the calculator should retum ' 4 ' on the text part. Assume that the user inputs two single digits with a single operator. Part 2 (10 pts) - Make the ' C ' button work. When you click the ' C ' button, it will cancel the equation you were entering, and you can enter a new equation on the calculator. - Improve the calculator in which you can see the equation that you've entered so far in the text part. When you input ' 5 ', ' 4 ', '4', '=' in the calculator, it should show the equation on the text part like the below: Part 3 (10 pts) Improve the calculator in which you can also enter an equation with multiple digits. Asiume that the user itill enten an equation with a single operator