$ coins_menu     # Comment: $ is the Bash prompt, another is at end when I exit coins_menu
Coins Menu

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 3

$0.00

Thank you!

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 1

Quarters? 40
Dimes? 20
Nickels? 10
Pennies? 5

Thank you!

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 3

$12.55

Thank you!

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 2

Quarters? 100
Dimes? 0
Nickels? 0
Pennies? 0

Thank you!

ERROR: Insufficient Funds

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 3

$12.55

Thank you!

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 2

Quarters? 10
Dimes? 1
Nickels? 1
Pennies? 3

Thank you!

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 3

$9.87

Thank you!

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 5

ERROR: Invalid Command

1. Deposit Change
2. Extract Change
3. Print Balance
4. Exit

User Input: 4

$