Contract structure and syntax in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a contract named MyContract.

Blockchain / Solidity

contract [1] {
}

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AMyContract

Bmycontract

CContract

DmyContract

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or different casing for the contract name.

The contract name must start with a capital letter and match the declaration. 'MyContract' is the correct name.

2fill in blank

medium

Complete the code to declare a public state variable of type uint named count.

Blockchain / Solidity

contract Counter {
    [1] public count;
}

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Aint

Buint

Cstring

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using signed integer int or wrong types like string or bool.

In Solidity, uint is an unsigned integer type commonly used for counters.

3fill in blank

hard

Fix the error in the function declaration to make it a public function named increment.

Blockchain / Solidity

contract Counter {
    uint public count;
    function [1]() public {
        count += 1;
    }
}

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AIncrement

Binc

Cincrement

DincrementCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase first letter or different function names.

Function names in Solidity are case-sensitive. The function should be named exactly 'increment' as specified.

4fill in blank

hard

Complete the code to declare a constructor that sets count to zero.

Blockchain / Solidity

contract Counter {
    uint public count;
    constructor() { {
        count {BLANK_2}} 0;
    }
}

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A{

B=

C;

D}

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong symbols like ';' instead of '{' or '='.

The constructor body starts with '{' and the assignment uses '=' to set count to zero.

5fill in blank

hard

Fill both blanks to complete a function that returns the current count.

Blockchain / Solidity

contract Counter {
    uint public count;
    function getCount() public view returns({BLANK_1}}) { {
        return {{BLANK_2}};
    }
}

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Auint256

B{

Ccount

Duint

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong return types, missing braces, or returning wrong variables.

The function returns a uint type, the body starts with '{', and it returns the variable count.