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  1. import java.util.*;
  2. import java.lang.Math.*;
  3. import java.io.*;
  4.  
  5. class geomVector
  6. {
  7. 	public double x1,x2,y1,y2,xV,yV,xM,yM,vL;
  8. 	public void setVector(double a1,double b1, double a2, double b2)
  9. 	{
  10. 		x1 = a1;
  11. 		x2 = a2;
  12. 		y1 = b1;
  13. 		y2 = b2;
  14. 	}
  15. 	public void getVectorCoords()
  16. 	{
  17. 		xV = x2 - x1;
  18. 		yV = y2 - y1;
  19. 	}
  20. 	public void getMiddleCoords()
  21. 	{
  22. 		getVectorCoords();
  23. 		xM = xV/2;
  24. 		yM = yV/2;
  25. 	}
  26. 	public void multiplyVector(double a)
  27. 	{
  28. 		x1*=a;
  29. 		x2*=a;
  30. 		y1*=a;
  31. 		y2*=a;
  32. 		getVectorCoords();
  33. 		getMiddleCoords();
  34. 	}
  35. 	public double getLength()
  36. 	{
  37. 		return vL = Math.sqrt(xV*xV+yV*yV);
  38. 	}
  39. 	public void vectorSum(geomVector a,geomVector b)
  40. 	{
  41. 		a.setVector(a.x1,a.y1,b.x2,b.y2);
  42. 	}
  43. 	public double scalMult(geomVector a,geomVector b)
  44. 	{
  45. 		return (a.xV*b.xV+a.yV*b.yV);
  46. 	}
  47. 	public double getAngle(geomVector a, geomVector b)
  48. 	{
  49. 		return Math.acos(scalMult(a,b)/(a.getLength()*b.getLength()));
  50. 	}
  51. }
  52.  
  53. public class Main {
  54. 	public static void main(String[] args)
  55. 	{
  56. 		double x1,x2,x3,x4,y1,y2,y3,y4;
  57. 		Scanner in = new Scanner(System.in);
  58. 		x1 = in.nextDouble();
  59. 		x2 = in.nextDouble();
  60. 		x3 = in.nextDouble();
  61. 		x4 = in.nextDouble();
  62. 		y1 = in.nextDouble();
  63. 		y2 = in.nextDouble();
  64. 		y3 = in.nextDouble();
  65. 		y4 = in.nextDouble();
  66. 		geomVector a = new geomVector();
  67. 		geomVector b = new geomVector();
  68. 		a.setVector(x1,y1,x2,y2);
  69. 		b.setVector(x3,y3,x4,y4);
  70. 		a.getVectorCoords();
  71. 		b.getVectorCoords();
  72. 		System.out.println(b.scalMult(b,a));
  73. 		System.out.println(a.getAngle(a,b));
  74. 	}
  75. }
Success #stdin #stdout 0.08s 4386816KB
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4 61 44 21 4 12 65 51
stdout
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-1423.0
2.7342438697918836
https://ideone.com/P6C9m6
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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