std::f64::consts::PI * (self.radius * self.radius)
}
- fn grow(&self) -> Circle {
- Circle { x: self.x, y: self.y, radius: (self.radius * 10.0) }
+ fn grow(&self, increment: f64) -> Circle {
+ Circle { x: self.x, y: self.y, radius: self.radius + increment }
}
}
let c = Circle { x: 0.0, y: 0.0, radius: 2.0 };
println!("{}", c.area());
- let d = c.grow().area();
+ let d = c.grow(2.0).area();
println!("{}", d);
}
```
```
We just say we're returning a `Circle`. With this method, we can grow a new
-circle with an area that's 100 times larger than the old one.
+circle to any arbitrary size.
## Static methods