add precision_root_algorithm

Misc/root_precision.java

@@ -0,0 +1,33 @@
+import java.io.*;
+import java.util.*;
+import java.text.*;
+import java.math.*;
+import java.util.regex.*;
+
+public class Solution {
+
+    public static void main(String[] args) {
+	//take input    
+      Scanner scn = new Scanner(System.in);
+
+      int N = scn.nextInt(); //N is the input number
+      int P = scn.nextInt(); //P is precision value for eg - P is 3 in 2.564 and 5 in 3.80870.
+
+      System.out.println(squareRoot(N, P));
+   }
+
+   public static double squareRoot(int N, int P) {
+        double rv = 0;  //rv means return value
+
+        double root = Math.pow(N, 0.5);
+
+	//calculate precision to power of 10 and then multiply it with root value.
+	int precision = (int) Math.pow(10, P);
+	root = root * precision;
+	 /*typecast it into integer then divide by precision and again typecast into double 
+	   so as to have decimal points upto P precision */ 
+
+	rv =  (int)root;
+      return (double)rv/precision;
+   }
+}