C++ Programming Quiz - Loops

What is the purpose of a loop in C++ programming?

• To execute a block of code only once

• To terminate the program

• To repeatedly execute a block of code until a certain condition is met.

• To skip a block of code

Answer explanation

In C++ programming, a loop is used to repeatedly execute a block of code until a specified condition is met. This is what separates it from the other options presented. It's not for executing a block once, terminating the program, or skipping code.

Which loop structure in C++ allows the code to be executed at least once?

• while

• do-while

• if-else

• for

Answer explanation

The 'do-while' loop in C++ is structured to allow the code to be executed at least once, regardless of the condition. This is because the condition check happens after the loop's code has been executed. This differentiates it from other loops like 'while', 'if-else', and 'for' where the condition is checked before executing the loop's code.

What is the syntax for a for loop in C++?

What is the syntax for a while loop in C++?

What is the syntax for a do-while loop in C++?

What is the difference between a while loop and a do-while loop in C++?

• A while loop checks the condition before executing the loop body, while a do-while loop checks the condition after executing the loop body.

• A while loop can only be used for numeric conditions, while a do-while loop can be used for any condition.

• A while loop checks the condition after executing the loop body, while a do-while loop checks the condition before executing the loop body.

• A while loop and a do-while loop are the same thing in C++.

Answer explanation

The correct response points out the main distinction between a while loop and a do-while loop in C++. A while loop tests the condition before executing the loop's body, whereas a do-while loop executes the loop's body first then checks the condition. Therefore, a do-while loop would always execute at least once, unlike a while loop.

How can you exit a loop prematurely in C++?

• continue

• return

• exit

• break

Answer explanation

In C++, the 'break' statement is used to exit a loop prematurely. This statement ends the loop immediately when it is encountered, skipping the remaining iterations. The other options, 'continue', 'return', and 'exit', have different functionalities in the language.

What is an infinite loop in C++?

• A loop that continues to execute indefinitely without terminating.

• A loop that only executes once and then terminates.

• A loop that terminates when a specific condition is met.

• A loop that executes a fixed number of times.

Answer explanation

An infinite loop in C++ is a construct that continues to execute without stopping, which matches the first option provided. It doesn't stop executing because the terminating condition either doesn't exist or isn't met during program execution. Other loop types such as a fixed iteration loop or conditional loop are designed to terminate after a certain condition is met or after a specific number of iterations.

What is the purpose of a break statement in C++?

• To restart the execution of a loop or switch statement.

• To pause the execution of a loop or switch statement.

• To terminate the execution of a loop or switch statement.

• To skip the current iteration of a loop.

Answer explanation

The purpose of a break statement in C++ is to terminate the execution of a loop or switch statement. It doesn't restart, pause, or skip the current iteration, but stops the execution completely and transfers control to the next statement following the loop or switch.

What is the purpose of a continue statement in C++?

• To terminate the current loop and exit the loop completely.

• To pause the execution of the program and wait for user input.

• To jump to a specific label within the code.

• To skip the remaining code in the current iteration of a loop and move to the next iteration.

Answer explanation

The correct answer is 'To skip the remaining code in the current iteration of a loop and move to the next iteration.' In C++, the 'continue' statement is used within looping structures to skip the remainder of the loop's body and immediately start the next iteration of the loop. This allows the loop to 'continue' with the next iteration, hence its name.