README.md

The do-while Loop in C++

Objective

In this lesson, we will explore the do-while loop in C++. The do-while loop is a type of loop that executes a block of code repeatedly as long as a specified condition is true. Unlike the for and while loops, the do-while loop ensures that the code block is executed at least once before checking the condition.

do-while Loop Syntax

The syntax of the do-while loop is as follows:

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

• condition: The Boolean expression that determines whether the loop should continue. The loop will execute as long as this condition is true.

Example

#include <iostream>

int main() {
    int count = 1;

    // Using a do-while loop to print numbers from 1 to 5
    do {
        std::cout << "Number: " << count << std::endl;
        count++;
    } while (count <= 5);

    return 0;
}

In this example, the do-while loop prints numbers from 1 to 5. Even though the condition is checked at the end of the loop, the code block is executed at least once.

Common Use Cases

The do-while loop is suitable for various programming scenarios:

• Input Validation: It can be used for input validation, ensuring that user input meets specific criteria.
• Menu-Driven Programs: do-while loops are often used in menu-driven programs to repeatedly display options to the user.
• Game Loops: In game development, do-while loops can handle game logic loops that run until a game over condition is met.

Loop Control Statements in do-while Loops

Inside a do-while loop, you can use loop control statements like break and continue to alter the loop's behavior, similar to other types of loops.

• break: Exits the loop prematurely when a certain condition is met.
• continue: Skips the current iteration of the loop and continues with the next iteration.

Conclusion

The do-while loop in C++ is a valuable construct for scenarios where you need to ensure that a code block is executed at least once, even before checking the loop condition. It is useful in input validation, menu-driven programs, and game development loops.