# Modifying basic calculator

In this assignment, you will modify your basic calculator to be a little more user-friendly. Make these
modifications:
1. If the user enters an invalid menu option, allow them to try again until they enter a valid one.
2. If the user chooses three invalid menu options in a row, give them a message about trying again
later and end the program.
3. After the user chooses a valid menu option and your program computes and displays the result,
you should start over again by displaying the menu. This should continue until the user chooses
Here are some example runs of the program:
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 9
I'm sorry, 9 wasn't one of the options
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 0
I'm sorry, 0 wasn't one of the options
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 7
I'm sorry, 7 wasn't one of the options
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2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 9
I'm sorry, 9 wasn't one of the options
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 0
I'm sorry, 0 wasn't one of the options
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 1
What is the first number? 3
What is the second number? 4
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 4
What is the first number? 6
What is the second number? 0
I'm sorry, you can't divide by zero.
2. Subtract
3. Multiply
4. Divide
5. Generate random number
6. Quit
What would you like to do? 4
What is the first number? 6
What is the second number? 2