Break Statement in Rust

In this tutorial, we will learn about the break statement in Rust. We will cover the basics of using the break statement to exit loops prematurely.

What is a Break Statement

A break statement is used to terminate the execution of a loop. When a break statement is encountered, the loop immediately terminates, and the program continues with the next statement following the loop.

Syntax

The syntax for the break statement in Rust is:

break;

The break statement can be used in loop, while, and for loops to exit the loop prematurely.


Example 1: Exiting a Loop Early

  1. Use a loop to iterate.
  2. Inside the loop, use an if statement to check if a condition is met.
  3. If the condition is true, use a break statement to exit the loop.

Rust Program

let mut i = 1;
loop {
    if i == 5 {
        break;
    }
    println!("{}", i);
    i += 1;
}

Output

1
2
3
4

Example 2: Exiting a While Loop Early

  1. Declare a variable i and initialize it to 1.
  2. Use a while loop to iterate while i is less than or equal to 10.
  3. Inside the loop, use an if statement to check if i is equal to 5.
  4. If the condition is true, use a break statement to exit the loop.
  5. Print the value of i.

Rust Program

let mut i = 1;
while i <= 10 {
    if i == 5 {
        break;
    }
    println!("{}", i);
    i += 1;
}

Output

1
2
3
4

Example 3: Exiting a For Loop Early

  1. Use a for loop to iterate over a range of numbers from 1 to 10.
  2. Inside the loop, use an if statement to check if the current number is equal to 5.
  3. If the condition is true, use a break statement to exit the loop.
  4. Print the current number.

Rust Program

for i in 1..=10 {
    if i == 5 {
        break;
    }
    println!("{}", i);
}

Output

1
2
3
4