Exit Controlled Loops in C++

In the previous lesson, we learned about entry controlled loops in C++. Entry controlled loops execute their code block as long as a specified condition is true at the beginning of each iteration. These loops include for loops and while loops. They are useful when you know the number of iterations beforehand or when you want to check the condition before entering the loop.

Introduction to Exit Controlled Loops

In this lesson, we will explore exit controlled loops in C++. Unlike entry controlled loops, exit controlled loops check the condition at the end of each iteration. This means that the loop code block will execute at least once, even if the condition is false initially. The condition is checked at the end of the loop, and if it is true, the loop continues to execute. Otherwise, the loop terminates and control moves to the next statement after the loop.

The do-while Loop

The primary construct for implementing an exit controlled loop in C++ is the do-while loop. The do-while loop executes its code block first and then checks the condition. If the condition is true, the loop repeats; otherwise, it terminates.

do {
    // Code block to be executed
} while (condition);

The do-while loop ensures that the code block executes at least once, regardless of the condition. This is particularly useful when you want to execute some code before checking a condition or when you want to ensure that a certain action is performed before exiting the loop.

Conclusion

Congratulations! You have now learned about exit controlled loops in C++. The do-while loop allows you to execute a code block at least once and then continue or exit based on a condition. It provides additional flexibility in designing loops and handling situations where you need to ensure the execution of certain code before checking a condition. In the next lesson, we will dive deeper into control flow in C++ and explore jumping statements that provide even more flexibility for loops. Happy coding!