45 lines
1.0 KiB
Java
45 lines
1.0 KiB
Java
/**
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@version 1.20 2004-02-10
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@author Cay Horstmann
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*/
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public class LotteryArray
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{
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public static void main(String[] args)
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{
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final int NMAX = 10;
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// allocate triangular array
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int[][] odds = new int[NMAX + 1][];
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for (int n = 0; n <= NMAX; n++)
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odds[n] = new int[n + 1];
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// fill triangular array
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for (int n = 0; n < odds.length; n++)
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for (int k = 0; k < odds[n].length; k++)
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{
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/*
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compute binomial coefficient
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n * (n - 1) * (n - 2) * . . . * (n - k + 1)
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-------------------------------------------
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1 * 2 * 3 * . . . * k
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*/
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int lotteryOdds = 1;
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for (int i = 1; i <= k; i++)
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lotteryOdds = lotteryOdds * (n - i + 1) / i;
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odds[n][k] = lotteryOdds;
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}
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// print triangular array
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for (int[] row : odds)
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{
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for (int odd : row)
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System.out.printf("%4d", odd);
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System.out.println();
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}
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}
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}
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