Rust Programming By Example

Creating structures

Sometimes, we have multiple values that only make sense together, such as the two coordinates of a point. Structures are a way to create new types that contains multiple members.

Here is how we would create the aforementioned Point structure:

struct Point {
    x: i32,
    y: i32,
}

To create a new point and access its members, we use the following syntax:

let point = Point {
    x: 24,
    y: 42,
};
println!("({}, {})", point.x, point.y);

What if we want to print the point as a whole?

Let's try the following:

println!("{}", point);

The compiler does not accept this:

error[E0277]: the trait bound `Point: std::fmt::Display` is not satisfied --> src/main.rs:7:20 | 7 | println!("{}", point); | ^^^^^ `Point` cannot be formatted with the default ...