Enhance bank account class by adding preconditions for the constructor and the deposit method that require the amount parameter to be atleast zero, and a precondition for the withdraw method that requires amount to be a value between 0 and the current balance.Use assertions to test the preconditions.
For deposit method:
if(amount<0)
{ // do something to indicate invalid data
}
else
{ // proceed with deposit
}
Similar for withdrawal.
Modifications of this kind is much easier if the class and associated methods are available.
I suggest you try to code the best you can and post what you have, and where you have a difficulty.
computer the pay for an employee input wii be:
name of employee
employee number
hourly rate
regular pay will
To enhance the bank account class with the specified preconditions, you can follow the steps below:
Step 1: Add Preconditions to the Constructor
- In the constructor of the bank account class, add a precondition that requires the amount parameter to be at least zero.
- To do this, you can use assertions to check if the amount is greater than or equal to zero.
- If the assertion fails (amount < 0), throw an exception or display an error message.
Here's an example implementation:
```python
class BankAccount:
def __init__(self, initial_balance):
assert initial_balance >= 0, "Initial balance must be at least zero"
self.balance = initial_balance
```
Step 2: Add Preconditions to the Deposit Method
- In the deposit method of the bank account class, add a precondition that requires the amount parameter to be at least zero.
- Use assertions to check if the amount is greater than or equal to zero.
- If the assertion fails (amount < 0), throw an exception or display an error message.
Here's an example implementation:
```python
class BankAccount:
# ... (constructor code here)
def deposit(self, amount):
assert amount >= 0, "Amount must be at least zero"
self.balance += amount
```
Step 3: Add Preconditions to the Withdraw Method
- In the withdraw method of the bank account class, add a precondition that requires the amount parameter to be between 0 and the current balance.
- Use assertions to check if the amount is within the valid range (0 <= amount <= self.balance).
- If the assertion fails (amount not within the valid range), throw an exception or display an error message.
Here's an example implementation:
```python
class BankAccount:
# ... (constructor and deposit method code here)
def withdraw(self, amount):
assert 0 <= amount <= self.balance, "Amount must be between 0 and the current balance"
self.balance -= amount
```
Step 4: Testing the Preconditions
- To test the preconditions, you can create an instance of the BankAccount class and call the constructor, deposit, and withdraw methods with various input values.
- If any of the assertions fail, an exception will be raised or an error message will be displayed.
Here's an example test:
```python
account = BankAccount(100) # Should pass
account.deposit(50) # Should pass
account.deposit(-20) # Should fail, raises an exception or displays an error message
account.withdraw(150) # Should fail, raises an exception or displays an error message
```
By following these steps, you can enhance the bank account class by adding preconditions and using assertions to test them. Remember to customize the error messages and exception handling based on your specific requirements and programming language.