Do A While Loop In Rust

Rust is a system programming language that provides developers with low-level features, allowing them to create more scalable and reliable software. This article provides a detailed guide on how to implement a ‘do-while loop’ in Rust language, a relatively common technique in programming.

Code snippet for Do While Loop in Rust

In the Rust programming language, there isn’t a built-in ‘do-while’ loop, but we can simulate it easily with the ‘loop’ and ‘if-else’ constructs. Below is a simple code snippet that implements a do-while loop:

fn main() {
    let mut counter = 0;

    loop {
        counter += 1;
        println!("counter is {}", counter);

        if counter >= 5 {
            break;
        }
    }
}

Code Explanation for Do While Loop in Rust

In the given code snippet, we are simulating a do-while loop using a ‘loop’ construct and an ‘if-else’ statement. Let’s break it down step by step for better understanding:

1. We start by declaring a mutable variable counter and initialize it to 0.

   let mut counter = 0;

2. The ‘loop’ construct in Rust provides functionality for creating an infinite loop. The code inside its block is executed continuously until a ‘break’ statement is reached.

   loop {...}

3. Inside the loop, we increment the counter by 1. Then, we print the current value of counter.

      counter += 1;
      println!("counter is {}", counter);

4. We then use an ‘if’ statement to check if the counter is greater than or equal to 5. If the condition is fulfilled, the ‘break’ statement is executed, stopping the loop.

       if counter >= 5 {
           break;
       }

5. If the condition is not met, the program goes back to the start of the loop block, increments the counter again, and repeats the process.

This process, as a whole, simulates the do-while loop, where the code inside the loop is executed at least once before the condition is checked, and the loop continues until the condition is met. This technique can be utilized effectively whenever we need the functionality of a do-while loop in Rust.