tasks a-s

Task/Nth-root/Java/nth-root-1.java

@@ -0,0 +1,18 @@
+public static double nthroot(int n, double A) {
+	return nthroot(n, A, .001);
+}
+public static double nthroot(int n, double A, double p) {
+	if(A < 0) {
+		System.err.println("A < 0");// we handle only real positive numbers
+		return -1;
+	} else if(A == 0) {
+		return 0;
+	}
+	double x_prev = A;
+	double x = A / n;  // starting "guessed" value...
+	while(Math.abs(x - x_prev) > p) {
+		x_prev = x;
+		x = ((n - 1.0) * x + A / Math.pow(x, n - 1.0)) / n;
+	}
+	return x;
+}