Level Two Quiz

int x = 5;

if (x > 3) {

cout << "Big";

} else {

cout << "Small";

}

What will this code print?

• Small

• Error

• Big

• Nothing

Answer explanation

The variable x is initialized to 5. The condition x > 3 evaluates to true, so the code inside the if block executes, printing 'Big'. Therefore, the correct answer is 'Big'.

How many times will this loop run?

for (int i = 0; i < 3; i++)

{ cout << i; }

• 1

• 2

• 3

• 4

Answer explanation

The loop starts with i = 0 and runs while i < 3. It increments i by 1 each iteration. Therefore, it runs for i = 0, 1, and 2, totaling 3 iterations. Thus, the correct answer is 3.

How do you access the third element in this array?

int arr[5] = {10, 20, 30, 40, 50};

• arr[2]

• arr(3)

• arr.3

• arr[3]

Answer explanation

In C, array indexing starts at 0. Therefore, the third element is accessed using arr[2]. The other options are incorrect because arr(3) and arr.3 are not valid syntax, and arr[3] refers to the fourth element.

What is the purpose of an if statement in C++?

• To repeat code many times

• To make decisions

• To print a message

• To define a new function

Answer explanation

The purpose of an if statement in C++ is to make decisions by executing certain code blocks based on whether a specified condition is true or false. This allows for conditional execution of code.

What is special about a do while loop?

• It never stops

• It doesn’t need a condition

• It runs at least once

• It doesn’t use a variable

Answer explanation

A do while loop is unique because it guarantees that the loop body will execute at least once, regardless of the condition. This is due to the condition being checked after the loop's body has run.

When does a while loop check the condition?

• Before the loop starts

• After the loop ends

• Only in the middle

• It doesn’t check

Answer explanation

A while loop checks the condition before the loop starts. If the condition is true, the loop executes; if false, it terminates. This ensures that the loop only runs when the condition is satisfied.

What is a array in C++?

• A type of loop

• A list of values stored in order

• A group of if statements

• A kind of function

Answer explanation

An array in C++ is a list of values stored in order, allowing for efficient access and manipulation of multiple items of the same type. This distinguishes it from loops, functions, or conditional statements.

What will happen if you forget ; in C++?

• The code will run faster

• Nothing will happen

• The loop will stop

• The code gives an error

Answer explanation

In C++, forgetting a semicolon (;) at the end of a statement will result in a compilation error. The compiler expects a semicolon to terminate statements, and its absence leads to syntax errors.

Why do programmers use loops?

• To break the code

• To repeat actions without writing the same code again

• To confuse the computer

• To skip errors

Answer explanation

Programmers use loops to repeat actions without writing the same code multiple times. This makes the code more efficient and easier to manage, allowing for tasks to be performed repeatedly with minimal effort.

How do you change the second element of an array arr to 100?

• arr[1] = 100;

• arr[2] = 100;

• arr(1) = 100;

• arr[2] = 100;

Answer explanation

To change the second element of an array in most programming languages, you use zero-based indexing. Therefore, the correct way to set the second element to 100 is 'arr[1] = 100;'. The other options are incorrect due to indexing errors.