Function overloading in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a function named add that takes two uint parameters.

Blockchain / Solidity

function add(uint a, uint b) public pure returns (uint) {
    return a [1] b;
}

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

A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to return the result.

The add function should return the sum of a and b. The plus sign + adds two numbers.

2fill in blank

medium

Complete the code to overload the add function to accept three uint parameters.

Blockchain / Solidity

function add(uint a, uint b, uint c) public pure returns (uint) {
    return a [1] b [2] c;
}

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using different operators for each addition.

Using subtraction or multiplication instead of addition.

The overloaded add function adds three numbers. Both operators should be + to sum all three parameters.

3fill in blank

hard

Fix the error in the overloaded add function that takes two string parameters and returns their concatenation.

Blockchain / Solidity

function add(string memory a, string memory b) public pure returns (string memory) {
    return string(abi.encodePacked(a [1] b));
}

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

A.

B+

C,

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using plus sign + to concatenate strings in Solidity.

Using dot or ampersand which are invalid here.

In Solidity, abi.encodePacked takes multiple arguments separated by commas to concatenate strings. The comma , is correct here.

4fill in blank

hard

Fill both blanks to create an overloaded add function that takes two int parameters and returns their sum.

Blockchain / Solidity

function add(int a, int b) public pure returns (int) {
    return a [1] b;
}

function add(int a, int b, int c) public pure returns (int) {
    return a [2] b + c;
}

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using different operators in each function.

Using subtraction or multiplication instead of addition.

Both functions add their int parameters using the plus operator +.

5fill in blank

hard

Fill both blanks to create an overloaded add function that takes two uint parameters and returns their sum, and another that takes two string parameters and returns their concatenation.

Blockchain / Solidity

function add(uint a, uint b) public pure returns (uint) {
    return a [1] b;
}

function add(string memory a, string memory b) public pure returns (string memory) {
    return string(abi.encodePacked(a,b));
}

function add(uint a, uint b, uint c) public pure returns (uint) {
    return a [2] b + c;
}

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

A+

B,

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using plus sign to concatenate strings instead of comma.

Using subtraction or multiplication instead of addition for numbers.

The first and third functions add numbers using +. The second function concatenates strings using abi.encodePacked with arguments separated by a comma ,.