fork download 
  1. import java.util.ArrayList;
  2. import java.util.List;
  3. import java.util.Random;
  4.  
  5. class CriticalHit {
  6. public static void main(String[] args) {
  7.     class Combo {
  8.         int d;
  9.         int hp;
  10.         public Combo(int d, int hp) {
  11.             this.d = d;
  12.             this.hp = hp;
  13.         }
  14.         public int getD() {
  15.             return d;
  16.         }
  17.         public int getHp() {
  18.             return hp;
  19.         }
  20.     }
  21.  
  22.     List input = new ArrayList<Combo>();
  23.  
  24.     input.add(new Combo(4, 1));
  25.     input.add(new Combo(4, 4));
  26.     input.add(new Combo(4, 5));
  27.     input.add(new Combo(4, 6));
  28.     input.add(new Combo(1, 10));
  29.     input.add(new Combo(100, 200));
  30.     input.add(new Combo(8, 20));
  31.  
  32.     input.forEach(s -> System.out.println(String.format("d: %d\thp: %d\tprobability: %8f\tdamage: %d",
  33.             ((Combo) s).getD(),
  34.             ((Combo) s).getHp(),
  35.             CriticalHit.getCritChance(((Combo) s).getD(), ((Combo) s).getHp()),
  36.             CriticalHit.getCrit(((Combo) s).getD()))));
  37. }
  38.  
  39. public static int getCrit(double d) {
  40.     int maxCrit = 0;
  41.     if (d != 1) {
  42.         Random r = new Random();
  43.         maxCrit = 1 + r.nextInt((int) d);
  44.         if (maxCrit == d)
  45.             maxCrit += getCrit(d);
  46.     }
  47.     return maxCrit;
  48. }
  49.  
  50. public static double getCritChance(double d, int hp) {
  51.     int exponent = (int) (hp / d);
  52.     int rest = (int) (hp % d);
  53.  
  54.     double chance = Math.pow(1 / d, exponent);
  55.     if (rest > 0)
  56.         chance *= (d - rest + 1) / d;
  57.  
  58.     return chance;
  59. }
  60. }
Success #stdin #stdout 0.22s 320832KB
comments ()
stdin 
Standard input is empty
stdout 
d: 4	hp: 1	probability: 1.000000	damage: 3
d: 4	hp: 4	probability: 0.250000	damage: 5
d: 4	hp: 5	probability: 0.250000	damage: 3
d: 4	hp: 6	probability: 0.187500	damage: 5
d: 1	hp: 10	probability: 1.000000	damage: 0
d: 100	hp: 200	probability: 0.000100	damage: 45
d: 8	hp: 20	probability: 0.009766	damage: 3
https://ideone.com/fdSS1s
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!