Arithmetic operators in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers and print the result.

C++

#include <iostream>

int main() {
    int a = 5, b = 3;
    int sum = a [1] b;
    std::cout << sum << std::endl;
    return 0;
}

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using minus - instead of plus +.

Using multiplication * or division / by mistake.

The plus sign + adds two numbers together.

2fill in blank

medium

Complete the code to calculate the remainder of division.

C++

#include <iostream>

int main() {
    int x = 10, y = 3;
    int remainder = x [1] y;
    std::cout << remainder << std::endl;
    return 0;
}

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

A/

B+

C%

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using division / instead of remainder %.

Using multiplication * or addition + by mistake.

The percent sign % gives the remainder after division.

3fill in blank

hard

Fix the error in the code to multiply two numbers correctly.

C++

#include <iostream>

int main() {
    int a = 4, b = 7;
    int product = a [1] b;
    std::cout << product << std::endl;
    return 0;
}

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

A*

B/

C-

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using plus + or minus - instead of multiplication.

Using division / by mistake.

The asterisk * is the multiplication operator in C++.

4fill in blank

hard

Fill both blanks to create a map of numbers to their squares for numbers greater than 3.

C++

#include <iostream>
#include <map>

int main() {
    std::map<int, int> squares;
    for (int num = 1; num <= 5; ++num) {
        if (num [1] 3) {
            squares[num] = num [2] num;
        }
    }
    for (const auto& [key, value] : squares) {
        std::cout << key << ": " << value << std::endl;
    }
    return 0;
}

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

A>

B<

C**

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than < instead of greater than >.

Using ** which is not a valid operator in C++.

The condition num > 3 selects numbers greater than 3. The multiplication operator * squares the number.

5fill in blank

hard

Fill all three blanks to create a map of uppercase letters to their ASCII codes for letters with codes greater than 65.

C++

#include <iostream>
#include <map>
#include <cctype>

int main() {
    std::map<char, int> letter_codes;
    for (char ch = 'A'; ch <= 'E'; ++ch) {
        if (static_cast<int>(ch) [1] 65) {
            letter_codes[[2]] = static_cast<int>([3]);
        }
    }
    for (const auto& [letter, code] : letter_codes) {
        std::cout << letter << ": " << code << std::endl;
    }
    return 0;
}

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

A>

Bch

Ctoupper(ch)

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than < instead of greater than >.

Using lowercase ch as value without conversion.

The condition ch > 65 checks ASCII codes greater than 65. The key uses ch and the value uses toupper(ch) to ensure uppercase letters.