JavaAlgorithms/Others/RootPrecision.java

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import java.util.Scanner;
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public class RootPrecision {
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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;
}
}