Why conditional logic is needed in C++ - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Adult" if age is 18 or more.

C++

int age = 20;
if (age [1] 18) {
    std::cout << "Adult" << std::endl;
}

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

A>=

B<

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' will check if age is less than 18, which is wrong here.

Using '==' checks only if age is exactly 18, not more.

The condition age >= 18 checks if age is 18 or more, so it prints "Adult" correctly.

2fill in blank

medium

Complete the code to print "Even" if the number is divisible by 2.

C++

int number = 10;
if (number [1] 2 == 0) {
    std::cout << "Even" << std::endl;
}

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

A%

B/

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' divides the number but does not check for evenness.

Using '*' or '+' does not relate to divisibility.

The modulus operator % gives the remainder. If number % 2 == 0, the number is even.

3fill in blank

hard

Fix the error in the condition to check if score is less than 50.

C++

int score = 45;
if (score [1] 50) {
    std::cout << "Fail" << std::endl;
}

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

A>

B==

C>=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' checks if score is greater than 50, which is wrong here.

Using '>=' or '==' do not check for less than.

The condition score < 50 correctly checks if the score is less than 50 to print "Fail".

4fill in blank

hard

Fill both blanks to print "Teenager" if age is between 13 and 19 inclusive.

C++

int age = 15;
if (age [1] 13 && age [2] 19) {
    std::cout << "Teenager" << std::endl;
}

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

A>=

B<

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '>' alone excludes boundary ages.

Using wrong operators reverses the logic.

The condition age >= 13 && age <= 19 checks if age is between 13 and 19 inclusive.

5fill in blank

hard

Fill in the blanks to print "Grade A" if score is above 90, "Grade B" if score is above 80, else "Grade C".

C++

int score = 85;
if (score [1] 90) {
    std::cout << "Grade A" << std::endl;
} else if (score [2] 80) {
    std::cout << "Grade B" << std::endl;
} else {
    std::cout << "Grade C" << std::endl;
}

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

A>

B>=

C<=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' includes the boundary which may change grading logic.

Using '<=' or '<' in conditions here is incorrect.

The conditions use score > 90 and score > 80 to check if score is above 90 or 80, printing the appropriate grade.