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  1. use std::io::stdin;
  2. use std::io::BufRead;
  3. use std::io::BufReader;
  4. use std::boxed::Box;
  5. use std::vec::Vec;
  6.  
  7. mod figures {
  8.  
  9. 	pub trait Figure {
  10. 		fn area(&self) -> f64;
  11. 		fn printName(&self) {
  12. 			print!("Figure = {} ", self.name());
  13. 		}
  14. 		fn name(&self) -> &'static str;
  15. 	}
  16.  
  17. 	pub struct Rectangle {
  18. 		w: f64,
  19. 		h: f64,
  20. 	}
  21.  
  22. 	impl Rectangle {
  23. 		pub fn new(width: f64, height: f64) -> Rectangle {
  24.             Rectangle { w: width, h: height }
  25.         }
  26. 	}
  27.  
  28. 	impl Figure for Rectangle {
  29. 		fn name(&self) -> &'static str {
  30.         	"Rectangle"
  31. 		}
  32. 		fn area(&self) -> f64 {
  33. 			self.h * self.w
  34. 		}
  35. 	}
  36.  
  37. 	pub struct Square {
  38. 		rectangle: Rectangle,
  39. 	}
  40.  
  41. 	impl Square {
  42. 		pub fn new(size: f64) -> Square {
  43. 			Square { rectangle: Rectangle { w: size, h: size } }
  44. 		}
  45. 	}
  46.  
  47. 	impl Figure for Square {
  48. 		fn name(&self) -> &'static str {
  49.         	"Square"
  50. 		}
  51. 		fn area(&self) -> f64 {
  52. 			self.rectangle.area()
  53. 		}
  54. 	}
  55.  
  56. 	pub struct Ellipse {
  57. 		rectangle: Rectangle,
  58. 	}
  59.  
  60. 	impl Ellipse {
  61. 		pub fn new(a: f64, b: f64) -> Ellipse {
  62. 			Ellipse { rectangle: Rectangle { w: a, h: b } }
  63. 		}
  64. 	}
  65.  
  66. 	impl Figure for Ellipse {
  67. 		fn name(&self) -> &'static str {
  68.         	"Ellipse"
  69. 		}
  70. 		fn area(&self) -> f64 {
  71. 			self.rectangle.area() * 3.1415
  72. 		}
  73. 	}
  74. }
  75.  
  76. fn main() {
  77. 	use figures::{Figure, Rectangle, Square, Ellipse};
  78. 	let mut v: Vec<Box<Figure>> = Vec::with_capacity(4);
  79. 	v.push(Box::new(Rectangle::new(2.0, 3.0)));
  80. 	v.push(Box::new(Square::new(4.0)));
  81. 	v.push(Box::new(Ellipse::new(2.0, 3.0)));
  82. 	for i in &v {
  83. 		i.printName();
  84. 		println!(", area: {}", i.area());
  85.     }
  86. }
  87.  
Success #stdin #stdout 0s 4520KB
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stdin
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Standard input is empty
stdout
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Figure = Rectangle , area: 6
Figure = Square , area: 16
Figure = Ellipse , area: 18.849
https://ideone.com/BGynKV
language:
Rust (rust 1.56)
created:
6 years ago
visibility:
public

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