Return values in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the stored value from the function.

Blockchain / Solidity

function getValue() public view returns (uint) {
    return [1];
}

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

AgetValue

Buint

Cvalue

Dreturn

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the function name instead of the variable.

Returning the type instead of the variable.

Using the keyword 'return' twice.

The function returns the variable value which holds the stored number.

2fill in blank

medium

Complete the code to return the sum of two numbers.

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 instead of addition.

Using multiplication or division operators by mistake.

The function returns the sum of a and b using the plus operator +.

3fill in blank

hard

Fix the error in the return statement to correctly return the balance.

Blockchain / Solidity

function getBalance() public view returns (uint) {
    uint balance = 100;
    return [1];
}

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

Abalance

Bbal

Cbalance()

DgetBalance

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a variable name that does not exist.

Adding parentheses to a variable name.

Returning the function name instead of the variable.

The variable balance holds the value to return. Using balance() or other names causes errors.

4fill in blank

hard

Fill both blanks to return the product of two numbers plus 1.

Blockchain / Solidity

function multiply(uint x, uint y) public pure returns (uint) {
    return x [1] y [2] 1;
}

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication first.

Using subtraction or division operators.

The function multiplies x and y using * and then adds 1 with +.

5fill in blank

hard

Fill both blanks to return a formatted string with the user's name and age.

Blockchain / Solidity

function getUserInfo(string memory name, uint age) public pure returns (string memory) {
    return string(abi.encodePacked([1], ": ", [2], " years old"));
}

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

Aname

Bage

Cstring(age)

DtoString(age)

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to concatenate a number without converting it to string.

Using the wrong function to convert number to string.

Missing the variable name for the first blank.

The function returns a string combining the name and the age converted to string using toString(age).