Nested Loops

This lesson discusses nested loops in Rust.

We'll cover the following

What Is a Nested Loop?

A nested loop is a loop within a loop.

Syntax

Here, a for loop nested inside a for loop. However, any loop can be nested inside any loop. The general syntax is:

Example

The following code prints a multiplication table of 1-5 using a nested for loop.

fn main() {
 for i in 1..5{ //outer loop
  println!("Multiplication Table of : {}", i);
   for j in 1..5 { // inner loop
       println!("{} * {} = {}", i, j, i * j);
   }
 }
}

Explanation

Outer for Loop

  • A for loop is defined on line 2
  • The loop takes i as an iterator that iterates over values from 1 to 5.

Inner for Loop

  • A for loop is defined on line 4
  • The loop takes j as an iterator that iterates over values from 1 to 5.
  • For each iteration of the outer loop, the inner loop runs four times while printing the product of variables i and j.

Sometimes, you might need to break the outer loop instead of the inner loop. So how can you specify which loop you are referring to? You can use a loop label.

Learn about loop labels in the next lesson!

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