Looping In Reverse in Rust in Rust

A for loop can also count backwards, as long as we define the right conditions. For example:

for i in (3..=7).rev() {
	println!("{}", i);
}

The output of this code is:

7
6
5
4
3

Let's break down this code:

• The range is (3..=7), so we start iterating from number 7 (in reverse).

• We end at 3 (the lower bound of the range). We could've written (3..8).rev() with an exclusive upper bound and it would still be correct.

• The .rev() call reverses the range, so we decrease our number by 1 every time.

Assignment

Let's print all numbers from 5 through -5 in decreasing order.

Hint
Look at the examples above if you get stuck.