//Sqrt.java

import javax.swing.*;

public class Sqrt extends JApplet {

    public void init() {
	String input;
    	double num;
	double numSqrt;

	input = JOptionPane.showInputDialog( "Enter a number" );
    	num = Double.parseDouble( input );
	//***sqrt method takes one double parameter (an int will be converted to double)
	//***Returns a double, so cannot assign to an int.
	numSqrt = Math.sqrt(num);

	JOptionPane.showMessageDialog(null, "Square root = " + numSqrt ); 

	//this is syntax error:
	//int answer = Math.sqrt(num);
    }	
} 
/* Try
 negative parameter
 2*num  as parameter
 no need of numSqrt
*/