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  1. import java.lang.Math;
  2.  
  3. public class Main {
  4. 	public static void main (String[] args) {
  5. 		//r^2 = (x - h)^2 + (y - k)^2
  6. 		//in order of r, h, k
  7. 		double[] equation = {5.0D, 4.0D, 2.0D};
  8. 		double epsilon = 0.0001; //acceptable error
  9.  
  10. 		int[][] pointsToTest = {{-3, 4}, {0, 2}, {1, 9}, {0, 5}};
  11. 		for (int ai = 0; ai < pointsToTest.length; ai++) {
  12. 			System.out.println("Point (" + pointsToTest[ai][0] + ", " + pointsToTest[ai][1] + ") is " + relationshipToCircle(epsilon, equation, pointsToTest[ai][0], pointsToTest[ai][1]) + ".");
  13. 		}
  14. 	}
  15.  
  16. 	public static String relationshipToCircle(double error, double[] eq, int x, int y) {
  17. 		double rsq = eq[0] * eq[0];
  18. 		double h = eq[1];
  19. 		double k = eq[2];
  20. 		double eval = Math.pow((x - h), 2) + Math.pow((y - k), 2);
  21.  
  22. 		if (Math.abs(eval - rsq) < error) { //difference in values negligible
  23. 			return "on the circle";
  24. 		} else if (eval > rsq) { //bigger than circle's radius so it's ouside
  25. 			return "outside of the circle";
  26. 		} else { //not outside, not on, so inside
  27. 			return "inside the circle";
  28. 		}
  29. 	}
  30. }
Success #stdin #stdout 0.03s 245632KB
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Standard input is empty
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Point (-3, 4) is outside of the circle.
Point (0, 2) is inside the circle.
Point (1, 9) is outside of the circle.
Point (0, 5) is on the circle.
https://ideone.com/7Cg7L
language:
Java (HotSpot 12)
created:
14 years ago
visibility:
public

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