Return values in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the sum of two integers.

C++

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

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

Aa * b

Ba - b

Cb - a

Da + b

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Returning one of the parameters alone.

The function should return the sum of a and b, which is 'a + b'.

2fill in blank

medium

Complete the code to return the length of a string.

C++

#include <string>

int getLength(const std::string& str) {
    return [1];
}

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

Astr.size()

Bstr.length

Cstr.count()

Dstr.length()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'count()' which is not a string method.

Using 'length' without parentheses.

Both 'str.size()' and 'str.length()' return the length of the string.

3fill in blank

hard

Fix the error in the function to correctly return the maximum of two numbers.

C++

int max(int x, int y) {
    if (x > y) {
        return [1];
    } else {
        return y;
    }
}

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

Ax

Bx > y

Cy

Dy > x

Attempts:

3 left

💡 Hint

Common Mistakes

Returning y inside the if block.

Returning a boolean expression instead of a variable.

If x is greater than y, the function should return x.

4fill in blank

hard

Fill both blanks to create a function that returns true if a number is even.

C++

bool isEven(int num) {
    return num [1] 2 [2] 0;
}

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

A%

B==

C!=

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' instead of '%'.

Using '!=' instead of '=='.

To check if a number is even, use the modulus operator '%' and compare the result to 0 with '=='.

5fill in blank

hard

Fill all three blanks to create a function that returns a new string with the first character capitalized.

C++

#include <string>
#include <cctype>

std::string capitalize(const std::string& s) {
    if (s.empty()) return s;
    std::string result = s;
    result[[1]] = std::toupper(s[[2]]);
    return [3];
}

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

A0

B1

Cresult

Ds

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 1 instead of 0 for the first character.

Returning the original string 's' instead of the modified 'result'.

The first character is at index 0. We capitalize s[0] and assign it to result[0], then return result.