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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static class Point {
  11. 		private double x, y;
  12. 		public Point(double x, double y){
  13. 			this.x = x;
  14. 			this.y = y;
  15. 		}
  16. 		public double getX(){
  17. 			return this.x;
  18. 		}
  19. 		public double getY(){
  20. 			return this.y;
  21. 		}
  22. 		private static double dotLine(Point a, Point b, Point d) {
  23. 			return (d.getX() - a.getX()) * (b.getY() - a.getY()) - (d.getY() - a.getY()) * (b.getX() - a.getX());
  24. 		}
  25. 		public static boolean dotDot(Point a, Point b, Point c, Point d) {
  26. 			return dotLine(a, b, c) * dotLine(a, b, d) >= 0;
  27. 		}
  28. 	}
  29.  
  30. 	public static void main (String[] args) throws java.lang.Exception
  31. 	{
  32. 		Scanner in = new Scanner(System.in);
  33. 		Point a = new Point(-2, 0);
  34. 		Point b = new Point(0, 1);
  35. 		Point c = new Point(0, -1);
  36. 		Point d = new Point(in.nextDouble(), in.nextDouble());
  37. 		if(d.getX()<0){
  38. 			if(Point.dotDot(a,b,c,d) && Point.dotDot(b,c,a,d) && Point.dotDot(c,a,b,d)){
  39. 				System.out.println("Точка D принадлежит заштрихованной части плоскости.");
  40. 			} else {
  41. 				System.out.println("Точка D не принадлежит заштрихованной части плоскости.");
  42. 			}
  43. 		} else {
  44. 			if (Math.sqrt(Math.pow(d.getX(), 2) + Math.pow(d.getY(), 2))<=1) {
  45. 				System.out.println("Точка D принадлежит заштрихованной части плоскости.");
  46. 			}
  47. 			else {
  48. 				System.out.println("Точка D не принадлежит заштрихованной части плоскости.");
  49. 			}
  50. 		}
  51. 	}
  52. }
Success #stdin #stdout 0.15s 321344KB
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stdout 
Точка D принадлежит заштрихованной части плоскости.
https://ideone.com/G4kL58
A59e
language:
Java (12.0.1)
created:
9 years ago
visibility:
secret

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