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90 lines
2.3 KiB
90 lines
2.3 KiB
//
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// Examples related to structs…
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//
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// Georg Hopp <georg@steffers.org>
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//
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// Copyright © 2019 Georg Hopp
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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#[derive(Debug)]
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struct Rectangle {
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width: u32,
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height: u32,
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}
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impl Rectangle {
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fn area(&self) -> u32 {
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self.width * self.height
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}
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fn can_hold(&self, inner: &Rectangle) -> bool {
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self.width >= inner.width && self.height >= inner.height
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}
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fn square(size: u32) -> Rectangle {
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Rectangle { width: size, height: size }
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}
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}
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fn main() {
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let width1 = 30;
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let height1 = 50;
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println!(
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"The area of the rectangle ist {} square pixels.",
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area(width1, height1));
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let rect1 = (30, 50);
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println!(
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"The area of the rectangle ist {} square pixels.",
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_area(rect1));
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let rect1 = Rectangle { width: 30, height: 50 };
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println!(
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"The area of the rectangle ist {} square pixels.",
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__area(&rect1));
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println!("_rect1 is {:?}", rect1);
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println!(
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"The area of the rectangle ist {} square pixels.",
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rect1.area());
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let rect2 = Rectangle { width: 10, height: 40};
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let rect3 = Rectangle { width: 60, height: 45};
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println!("Can rect1 hold rect2? {}", rect1.can_hold(&rect2));
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println!("Can rect1 hold rect3? {}", rect1.can_hold(&rect3));
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let square1 = Rectangle::square(32);
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println!("Got the square rectange: {:?}", square1);
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}
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fn area(width: u32, height: u32) -> u32 {
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width * height
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}
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fn _area(dimensions: (u32, u32)) -> u32 {
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let (width, height) = dimensions;
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width * height
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}
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fn __area(rectangle: &Rectangle) -> u32 {
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rectangle.width * rectangle.height
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}
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