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Random remarks #16585

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Aug 19, 2014
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Random remarks #16585

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f8a9211
Explain modulo in the guide.
steveklabnik Aug 18, 2014
c88feff
Make comment about small bias in %.
steveklabnik Aug 18, 2014
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12 changes: 10 additions & 2 deletions src/doc/guide.md
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Expand Up @@ -1888,8 +1888,16 @@ fn main() {

The first thing we changed was to `use std::rand`, as the docs
explained. We then added in a `let` expression to create a variable binding
named `secret_number`, and we printed out its result. Let's try to compile
this using `cargo build`:
named `secret_number`, and we printed out its result.

Also, you may wonder why we are using `%` on the result of `rand::random()`.
This operator is called 'modulo', and it returns the remainder of a division.
By taking the modulo of the result of `rand::random()`, we're limiting the
values to be between 0 and 99. Then, we add one to the result, making it from 1
to 100. Using modulo can give you a very, very small bias in the result, but
for this example, it is not important.

Let's try to compile this using `cargo build`:

```{notrust,no_run}
$ cargo build
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