RootPrecision.java

package Others;

import java.util.Scanner;

public class RootPrecision {

    public static void main(String[] args) {
        // take input
        Scanner scn = new Scanner(System.in);

        // N is the input number
        int N = scn.nextInt();

        // P is precision value for eg - P is 3 in 2.564 and 5 in 3.80870.
        int P = scn.nextInt();
        System.out.println(squareRoot(N, P));
    }

    public static double squareRoot(int N, int P) {
        // rv means return value
        double rv;

        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 rv / precision;
    }
}