[rustc.git] / src / doc / book / redirects / mutability.md

% Mutability

<small>There is a new edition of the book and this is an old link.</small>

> Variables are immutable only by default; we can make them mutable by adding mut in front of the variable name.

```rust
let mut x = 5;
println!("The value of x is: {}", x);
x = 6;
println!("The value of x is: {}", x);
```

---

Here are the relevant sections in the new and old books:

* **[In the second edition: Ch 3.01 — Variables and Mutability][2]**
* <small>[In the first edition: Ch 3.11 — Mutability][1]</small>


[1]: first-edition/mutability.html
[2]: second-edition/ch03-01-variables-and-mutability.html
Commit	Line	Data
2c00a5a8	1	% Mutability
cc61c64b	2
2c00a5a8	3	<small>There is a new edition of the book and this is an old link.</small>
cc61c64b	4
2c00a5a8	5	> Variables are immutable only by default; we can make them mutable by adding mut in front of the variable name.
cc61c64b	6
2c00a5a8 XL	7	```rust
	8	let mut x = 5;
	9	println!("The value of x is: {}", x);
	10	x = 6;
	11	println!("The value of x is: {}", x);
	12	```
	13
	14	---
	15
	16	Here are the relevant sections in the new and old books:
	17
	18	* [In the second edition: Ch 3.01 — Variables and Mutability][2]
	19	* <small>[In the first edition: Ch 3.11 — Mutability][1]</small>
7cac9316 XL	20
	21
	22	[1]: first-edition/mutability.html
abe05a73	23	[2]: second-edition/ch03-01-variables-and-mutability.html