Function calling in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to call the function greet.

C++

#include <iostream>

void greet() {
    std::cout << "Hello!" << std::endl;
}

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

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Agreet()

Bgreet

Cgreet();()

Dcall greet()

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the parentheses when calling the function.

Trying to call the function with extra words like 'call'.

To call a function in C++, you write its name followed by parentheses, like greet().

2fill in blank

medium

Complete the code to call the function add with arguments 5 and 3.

C++

#include <iostream>

int add(int a, int b) {
    return a + b;
}

int main() {
    int result = [1];
    std::cout << result << std::endl;
    return 0;
}

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Aadd(5, 3)

Badd(5 3)

Cadd(5; 3)

Dadd 5, 3

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting parentheses or commas between arguments.

Using semicolons or spaces instead of commas.

To call a function with arguments, write the function name followed by parentheses containing the arguments separated by commas, like add(5, 3).

3fill in blank

hard

Fix the error in calling the function multiply with arguments 4 and 7.

C++

#include <iostream>

int multiply(int x, int y) {
    return x * y;
}

int main() {
    int product = [1];
    std::cout << product << std::endl;
    return 0;
}

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Amultiply(4 7)

Bmultiply(4, 7)

Cmultiply(4;7)

Dmultiply 4, 7

Attempts:

3 left

💡 Hint

Common Mistakes

Using spaces or semicolons instead of commas between arguments.

Omitting parentheses around arguments.

The correct way to call a function with two arguments is to separate them with a comma inside parentheses: multiply(4, 7).

4fill in blank

hard

Fill both blanks to call divide with arguments 10 and 2, and store the result.

C++

#include <iostream>

double divide(double a, double b) {
    return a / b;
}

int main() {
    double result = [1];
    std::cout << [2] << std::endl;
    return 0;
}

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Adivide(10, 2)

Bresult

Cdivide(10 2)

D10 / 2

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to print the function call directly instead of the stored result.

Using spaces instead of commas between arguments.

You call the function with divide(10, 2) and print the stored variable result.

5fill in blank

hard

Fill all three blanks to call concat with two strings and print the result.

C++

#include <iostream>
#include <string>

std::string concat(std::string s1, std::string s2) {
    return s1 + s2;
}

int main() {
    std::string combined = [1];
    std::cout << [2] << std::endl;
    return [3];
}

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Aconcat("Hello, ", "World!")

Bcombined

C0

Dconcat("Hello" "World")

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting commas between string arguments.

Trying to print the function call directly instead of the variable.

Returning a non-zero value from main.

Call the function with two strings separated by a comma, print the stored variable, and return 0 to end the program.