Building a Calculator¶

In this assignment we will build a simple calculator that performs binary operations between two numbers.

Create a calculator that:

1. Shows a menu of options (add, subtract, multiply, divide, quit)
2. Keeps running until the user chooses to quit
3. Performs the chosen operation on two numbers

Example Output¶

Here's an example of what it might look like for the calculator to run twice. The first time the user enters "add" and then "17" and "23".

Menu:
- add
- subtract
- multiply
- divide
- quit
Choose an option: add
Enter a first number: 17
Enter a second number: 23
Output: 17 + 23 = 40

In this second example, the user enters an invalid choice, "exponent" and an error message is displayed and the Menue is displayed again.

Menu:
- add
- subtract
- multiply
- divide
- quit
Choose an option: exponent
Error: exponent is not an option

Menu:
- add
- subtract
- multiply
- divide
- quit
Choose an option: quit
Goodbye!

This calculator should validate that the option that was select is correct and keep providing the menue until it is.

Do the above FIRST before attempting anythinge below.

Hard Mode¶

• Make the calculator run in a loop until quit, when it's done calculating something, it should loop back to the original menu.
• Support mod (%) and exponent (**) as options.

Very Hard Mode¶

Only attempt this after you've done all of the above.

• Make it work like a real calcualtor does. Mark "Input:" and "Output:". Display the number that the user inputs. Then they input +, -, /, *, **, or %, then another number and it imemdiately calculates the result.
• Instead of quit support clear so that the user can undo their first number entry.
• Allow users to chain together calculations.

Example of this all together:

Input:  7
Output: 7
Input:  +
Output: 7
Input:  7
Output: 14
Input:  +
Output: 7
Input:  6
Output: 18
Input:  clear
Output: 0
Input:  -
Output: 0
Input:  15
Output: -15