Mortgage Payment

Design a class that will determine the monthly payment on a home mortgage. The monthly payment with interest compounded monthly can be calculated as follows:

1. **Class Design**:
- The class `Mortgage_Calculator` should have member functions for setting the loan amount, interest rate, and number of years of the loan.
- It should also have member functions for returning the monthly payment amount and the total amount paid to the bank at the end of the loan period.
- Implement the class in a complete program.

2. **Input Validation**:
- Only accept numbers.
- The program will exit if the loan amount is less than 0.
- After calculating and printing out mortgage information, ask the user if they want to run the program again.
- If the user enters 'Y' or 'y', the program will prompt the user to calculate another mortgage amount.
- If the user enters anything other than 'Y' or 'y', the program will exit with "Have a nice day" printed.

3. **Example**:
- Use the sample data in the screenshot below as your input example:
- Data validation: Use "ten" as input to check for number-only validation.
- Loan amount: 250000
- Interest rate: 2.875
- Loan year: 30

4. **Program Output**:
- Your program output should be similar to the following:

```
Enter the amount of loan (<0 to quit): ten
Loan amount must be a number >0. Please re-enter:
Enter the amount of loan (<0 to quit): 250000
Enter the annual interest rate in decimal form (%): 2.875
Enter the length of the loan in years: 30

Monthly Payment: $1037.23
Total Pay Back: $373403.23

Calculate another mortgage? (Y/N): y
Enter the amount of loan (<0 to quit): -1
Have a nice day.
```