Conditionals and Loops

Condition in a do-while Loop

Is it possible to have a condition that always evaluates to false in a do-while loop?

Abstract art representing computer programming

Yes, it is possible to have a condition that always evaluates to false in a do-while loop. In such cases, the loop body will execute exactly once, regardless of the condition.

Here's an example:

#include <iostream>

int main() {
  do {
    std::cout << "This will be printed once.\n";
  } while (false);

  std::cout << "Loop ended.\n";
}
This will be printed once.
Loop ended.

In this code, the condition false is used in the do-while loop. Since the condition is always false, the loop body is executed once, and then the loop terminates.

This behavior can be useful in situations where you want to ensure that a certain block of code is executed at least once, even if the condition is initially false. However, it's important to be cautious when using such constructs, as they can make the code less readable and potentially confusing.

In most cases, if you only need to execute a block of code once, it's clearer to use an if statement or simply write the code without any loop construct.

This Question is from the Lesson:

Conditionals and Loops

Learn the fundamentals of controlling program flow in C++ using if statements, for loops, while loops, continue, and break

Answers to questions are automatically generated and may not have been reviewed.

This Question is from the Lesson:

Conditionals and Loops

Learn the fundamentals of controlling program flow in C++ using if statements, for loops, while loops, continue, and break

A computer programmer
Part of the course:

Professional C++

Comprehensive course covering advanced concepts, and how to use them on large-scale projects.

Free, unlimited access

This course includes:

  • 125 Lessons
  • 550+ Code Samples
  • 96% Positive Reviews
  • Regularly Updated
  • Help and FAQ
Free, Unlimited Access

Professional C++

Comprehensive course covering advanced concepts, and how to use them on large-scale projects.

Screenshot from Warhammer: Total War
Screenshot from Tomb Raider
Screenshot from Jedi: Fallen Order
Contact|Privacy Policy|Terms of Use
Copyright © 2024 - All Rights Reserved