Data commit

Task/Evaluate-binomial-coefficients/Kotlin/evaluate-binomial-coefficients.kotlin

@@ -0,0 +1,23 @@
+// version 2.0
+
+fun binomial(n: Int, k: Int) = when {
+    n < 0 || k < 0 -> throw IllegalArgumentException("negative numbers not allowed")
+    n == k         -> 1L
+    else           -> {
+        val kReduced = min(k, n - k)    // minimize number of steps
+        var result = 1L
+        var numerator = n
+        var denominator = 1
+        while (denominator <= kReduced)
+            result = result * numerator-- / denominator++
+        result
+    }
+}
+
+fun main(args: Array<String>) {
+    for (n in 0..14) {
+        for (k in 0..n)
+            print("%4d ".format(binomial(n, k)))
+        println()
+    }
+}