Function declaration and syntax in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a simple function named greet.

Blockchain / Solidity

function [1]() {
  return "Hello!";
}

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

Agreet

Bwelcome

CsayHello

Dhello

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name than 'greet'.

Forgetting to write the function name after 'function'.

The function name must be greet as specified.

2fill in blank

medium

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

Blockchain / Solidity

function add([1], b) {
  return a + b;
}

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Ax

Bnum

Ca

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than 'a'.

Mismatching parameter names with the function body.

The first parameter must be named a to match the function signature.

3fill in blank

hard

Fix the error in the function declaration by completing the missing keyword.

Blockchain / Solidity

[1] add(a, b) {
  return a + b;
}

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Afunction

Bfunc

Cdef

Dmethod

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'func' or 'def' instead of 'function'.

Omitting the function declaration keyword.

In blockchain smart contract languages like Solidity, the keyword function declares a function.

4fill in blank

hard

Fill both blanks to declare a public function named multiply that returns the product of two numbers.

Blockchain / Solidity

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

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Amultiply

B+

C*

Dsubtract

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '*' for multiplication.

Using a wrong function name that does not match the operation.

The function name is 'multiply' and the operator for multiplication is '*'.

5fill in blank

hard

Fill all three blanks to declare a private function named subtract that takes two uint parameters and returns their difference.

Blockchain / Solidity

function [1](uint [2], uint [3]) private returns (uint) {
  return a - b;
}

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

Asubtract

Ba

Cb

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect parameter names that do not match the function body.

Using a wrong function name like 'add' instead of 'subtract'.

The function name is 'subtract', and the parameters are 'a' and 'b' to match the return statement.