Why functions are needed in C++ - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function named greet.

C++

void [1]() {
    std::cout << "Hello!" << std::endl;
}

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

Agreet

Bmain

Cprint

DsayHello

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name than 'greet'.

Confusing function name with main.

The function name should be greet as requested.

2fill in blank

medium

Complete the code to call the function greet inside main.

C++

int main() {
    [1]();
    return 0;
}

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Agreet

Bprint

CsayHello

Dhello

Attempts:

3 left

💡 Hint

Common Mistakes

Calling a function that was not defined.

Forgetting the parentheses after the function name.

To call the function defined as greet, use greet();.

3fill in blank

hard

Fix the error in the function definition by completing the return type.

C++

[1] greet() {
    std::cout << "Hello!" << std::endl;
}

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Afloat

Bstring

Cint

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using a return type that requires a return statement.

Leaving the return type blank.

The function does not return a value, so its return type should be void.

4fill in blank

hard

Fill both blanks to create a function that adds two numbers and returns the result.

C++

[1] add(int a, int b) {
    return a [2] b;
}

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Aint

B+

C-

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using void as return type when returning a value.

Using subtraction - instead of addition.

The function returns an integer, so the return type is int. To add two numbers, use the + operator.

5fill in blank

hard

Fill all three blanks to create a function that checks if a number is positive.

C++

bool [1](int num) {
    if (num [2] 0) {
        return [3];
    } else {
        return false;
    }
}

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

AisPositive

B>

Ctrue

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using equality operator instead of greater than.

Returning false instead of true when condition is met.

The function name is isPositive. To check if a number is greater than zero, use >. If true, return true.