// File: UsefulIOSubunit.java
//
// Author: Rahul Simha
// Created: Aug 18, 1998
//
// Illustrates packages

package useful_io_pack;

import java.io.*;
import java.util.*;

public class UsefulIOSubunit {

    // Read a string from the screen.

    public static String readString (String prompt)
    {
	System.out.print (prompt);
	InputStreamReader isr = new InputStreamReader (System.in);
	LineNumberReader lr = new LineNumberReader (isr);
	try {
	    String s = lr.readLine ();
	    return s;
	}
	catch (IOException e) {
	    System.out.println ("UsefulIO::readString: cannot read\n");
	    System.exit (0);
	    return "";
	}
    }

    // Parse a string for a property.
    
    public static double readProperty (String inString, String property)
    {
	StringTokenizer st = new StringTokenizer (inString);
	
	String firstPart = st.nextToken ("=");
	firstPart = firstPart.trim ();
	
	if (!firstPart.equals (property)){
	    System.out.println ("Improper string: " + inString);
	    System.exit (0);
	}
	String secondPart = st.nextToken (" =\t\n\r");
	secondPart = secondPart.trim();
	
	try {
	    Double d = Double.valueOf (secondPart);
	    return d.doubleValue();
	}
	catch (NumberFormatException e) {
	    System.out.println ("Second part not a number: " + secondPart);
	    System.exit (0);
	}
	return 0;
    }

}