Square Root In Java

Program To Find Square Root Of An Integer In Java 

//Program Starts Here
import java.io.*;
class sqr
{
public static void main(String arg[]) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.print("Enter A number to find its Square Root: ");

 double num=Double.parseDouble(br.readLine());

 if(num<0)
{
double i;
i=-num;
System.out.print("\nSquare root of "+num+" is: "+(Math.sqrt(i))+"i \nwhere i stands for iota\n");
}

else
{
System.out.print("\nSquare root of "+num+" is: "+(Math.sqrt(num))+"\n");
}
}
} 
//Program Ends Here 

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