#1. In the following code, what does the function named subProg do? i.e., what task does the function accomplish? (Do NOT describe the internal logic of the code.) ( 4 points )

import ccj.*;
public class ST2
{
public static void main (String [ ] args)
{
double x = 8;
double y = subProg ( x );
System.out.println ("y = " + y );
}

public static double subProg ( double a )
{
if ( a <= 0 ) return 0;
double xnew = a / 2;
double xold;
do
{
xold = xnew;
xnew = ( xold + a / xold ) / 2;
} while (Numeric.compareDoubles(xnew, xold) != 0 )
return xnew;
}
}

#2. Your program is named ST1 and begins:

import ccj.*;
public class ST1
{
public static void main (String [ ] args)
{ ...


Explain what the command



ST1 < test1.in



is used for. What is in test1.in? What is the purpose of this command? ( 3 points )

#3. What is the purpose of a "throw" statement as used in Chapter 7? ( 3 points )

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