Removed old data types

1 files changed, 53 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/funcutils/NumberUtils.java b/BJC-Utils2/src/main/java/bjc/utils/funcutils/NumberUtils.java
new file mode 100644
index 0000000..1f8f61d
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/funcutils/NumberUtils.java
@@ -0,0 +1,53 @@
+package bjc.utils.funcutils;
+
+import java.util.function.Function;
+
+/**
+ * Utility functions for dealing with numbers
+ * 
+ * @author ben
+ *
+ */
+public class NumberUtils {
+	/**
+	 * Compute the falling factorial of a number
+	 * 
+	 * @param value
+	 *            The number to compute
+	 * @param power
+	 *            The power to do the falling factorial for
+	 * @return The falling factorial of the number to the power
+	 */
+	public static int fallingFactorial(int value, int power) {
+		if (power == 0) {
+			return 1;
+		} else if (power == 1) {
+			return value;
+		} else {
+			int result = 1;
+
+			for (int currentSub = 0; currentSub < power
+					+ 1; currentSub++) {
+				result *= value - currentSub;
+			}
+
+			return result;
+		}
+	}
+
+	/**
+	 * Evaluates a linear probability distribution
+	 * 
+	 * @param topExp
+	 *            The number of winning possibilities
+	 * @param bottomExp
+	 *            The number of total possibilities
+	 * @param rng
+	 *            The function to use to generate a random possibility
+	 * @return Whether or not a random possibility was a winning one
+	 */
+	public static boolean isProbable(int topExp, int bottomExp,
+			Function<Integer, Integer> rng) {
+		return rng.apply(bottomExp) < topExp;
+	}
+}