First smart contract deployment in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a smart contract named MyContract.

Blockchain / Solidity

contract [1] {
    // contract code
}

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AMyContract

Bmycontract

CContract1

DSmartContract

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase names for the contract.

Using generic names like Contract1.

The contract name should start with a capital letter and match the deployment name. Here, MyContract is the correct name.

2fill in blank

medium

Complete the code to define a public state variable named owner of type address.

Blockchain / Solidity

address public [1];

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Aowner

Bcreator

Cuser

Dadmin

Attempts:

3 left

💡 Hint

Common Mistakes

Using generic names like admin or user instead of owner.

Forgetting to declare the variable as public.

The variable owner is commonly used to store the address of the contract owner and is declared as public to allow external access.

3fill in blank

hard

Fix the error in the constructor to set the owner to the address that deploys the contract.

Blockchain / Solidity

constructor() {
    [1] = msg.sender;
}

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Aaddress owner

Bowner

Cowner()

Dmsg.sender

Attempts:

3 left

💡 Hint

Common Mistakes

Using owner() which looks like a function call.

Trying to redeclare the variable inside the constructor.

The constructor should assign msg.sender to the state variable owner. Using owner directly is correct.

4fill in blank

hard

Fill both blanks to create a function named getOwner that returns the owner address.

Blockchain / Solidity

function [1]() public view returns ([2]) {
    return owner;
}

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AgetOwner

Baddress

Cowner

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect return types like string.

Naming the function something unrelated.

The function name should be getOwner and it returns an address type.

5fill in blank

hard

Fill all three blanks to deploy the contract and assign the owner correctly.

Blockchain / Solidity

contract [1] {
    address public [2];
    constructor() {
        [3] = msg.sender;
    }
}

Drag options to blanks, or click blank then click option'

AMyContract

Bowner

Cadmin

Dcreator

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the owner variable in different places.

Forgetting to assign the owner in the constructor.

The contract name is MyContract, the state variable is owner, and the constructor assigns msg.sender to owner.