Infinite Loop

Part of the Fundamentals section of Coddy's Rust journey — lesson 43 of 75.

In Rust, infinite loops can be created using either loop or while true. Both run until explicitly stopped with break or program termination.

For example:

loop {
    // Code to be executed repeatedly
    if condition {
        break; // Exit the loop if the condition is met
    }
}

The loop continues until it reaches a break. It's useful for programs that need to run continuously, like servers or devices.

Here's an example of an infinite loop that prints numbers until a specific condition is met:

let mut count = 0;
loop {
    println!("Count: {}", count);
    count += 1;
    if count > 5 {
        break;
        // Exit the loop when count is greater than 5
    }
}

In this example, the loop will print numbers from 0 to 5 and then exit when count becomes 6.

Challenge

Beginner

Write a Rust program that simulates a simple counter. The program should use an infinite loop to continuously increment a counter and print its value. The loop should terminate when the counter reaches a specific value determined by the input.

Steps for the program:

Initialize a mutable variable counter to 0.
Use an infinite loop (loop) to continuously increment the counter by 1 in each iteration.
Inside the loop, print the current value of counter.
Check if counter is equal to the user-provided termination value. If it is, break out of the loop.

Cheat sheet

Infinite loops in Rust can be created using loop or while true. They run until explicitly stopped with break.

Basic infinite loop syntax:

loop {
    // Code to be executed repeatedly
    if condition {
        break; // Exit the loop if the condition is met
    }
}

Example with counter:

let mut count = 0;
loop {
    println!("Count: {}", count);
    count += 1;
    if count > 5 {
        break;
    }
}

Try it yourself

use std::io;

fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    let limit: i32 = input.trim().parse().unwrap();

    let mut counter = 0;
    // Write your code below

}