[Introduction to programming in Java 笔记] 1.3.8 Gambler's ruin simulation 赌徒破产模拟

赌徒赢得机会有多大？

public class Gambler{public static void main(String[] args){ // Run T experiments that start with $stake and terminate on $0 and $goalint stake = Integer.parseInt(args[0]);int goal = Integer.parseInt(args[1]);int T= Integer.parseInt(args[2]);int bets = 0;int wins = 0;for (int t = 0; t < T; t++){ // Run one experimentint cash = stake;while(cash > 0 && cash < goal){ // Simulate one bet.bets++;if (Math.random() < 0.5) cash++;else cash--;} // Cash is either 0 (ruin) or $goal (win)if (cash == goal) wins++;}System.out.println(100*wins/T + "% wins");System.out.println("Avg # bets: " + bets/T);}}

运行结果