JavaAlgorithms/Others/root_precision.java

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import java.util.*;
public class Solution {
public static void main(String[] args) {
//take input
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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.
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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;
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}
}