Inheritance Exercise

Exercise - Demonstrate your knowledge of inheritance.

Create contracts that adhere to the following specifications.

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Contracts

Employee

Create an abstract contract called Employee. It should have:

• A public variable storing idNumber
• A public variable storing managerId
• A constructor that accepts arguments for and sets both of these variables
• A virtual function called getAnnualCost that returns a uint

Salaried

A contract called Salaried. It should:

• Inherit from Employee
• Have a public variable for annualSalary
• Implement an override function for getAnnualCost that returns annualSalary
• An appropriate constructor that performs any setup, including setting annualSalary

Hourly

Implement a contract called Hourly. It should:

• Inherit from Employee
• Have a public variable storing hourlyRate
• Include any other necessary setup and implementation

The annual cost of an hourly employee is their hourly rate * 2080 hours.

Manager

Implement a contract called Manager. It should:

• Have a public array storing employee Ids
• Include a function called addReport that can add id numbers to that array
• Include a function called resetReports that can reset that array to empty

Salesperson

Implement a contract called Salesperson that inherits from Hourly.

Engineering Manager

Implement a contract called EngineeringManager that inherits from Salaried and Manager.

Deployments

You’ll have to do a more complicated set of deployments for this exercise.

Deploy your Salesperson and EngineeringManager contracts. You don’t need to separately deploy the other contracts.

Use the following values:

Salesperson

• Hourly rate is 20 dollars an hour
• Id number is 55555
• Manager Id number is 12345

Manager

• Annual salary is 200,000
• Id number is 54321
• Manager Id is 11111

Inheritance Submission

Copy the below contract and deploy it using the addresses of your Salesperson and EngineeringManager contracts.

contract InheritanceSubmission {
    address public salesPerson;
    address public engineeringManager;

    constructor(address _salesPerson, address _engineeringManager) {
        salesPerson = _salesPerson;
        engineeringManager = _engineeringManager;
    }
}

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Submit your Contracts and Earn an NFT Badge! (BETA)

Hey, where’d my NFT go!?

Testnets are not permanent! Base Goerli will soon be sunset, in favor of Base Sepolia.

As these are separate networks with separate data, your NFTs will not transfer over.

Don’t worry! We’ve captured the addresses of all NFT owners on Base Goerli and will include them when we release the mechanism to transfer these NFTs to mainnet later this year! You can also redeploy on Sepolia and resubmit if you’d like!

Submit your address for your copy of the InheritanceSubmission contract that contains your other contract addresses.