/* This program  provides examples of Java IO using:
 * 		Keyboard input using Scanner
 * 		Keyboard input using BufferedReader
 * 		File input using BufferedReader
 * 		File input using Scanner
 * Need two input files
 *		javaIO.txt for input from file using BufferReader
 *		Newname.txt for input from file using Scanner
 *
 * Chuck Lillie
 * 10/31/2005
 */	
	
import java.util.*;	
import java.io.*;
	
public class javaIO {

// Use this to open a file for output	
	static PrintStream p = FileOut();
 	/**
	 * Routine to open a file to output data to the file homework5.txt
	 */
	public static PrintStream FileOut() {
		String filename = "output.txt"; // output.txt is a file in the same directory as this program
										// can have any filename.
    	FileOutputStream out; // declare a file output object
    	PrintStream p = null; // declare a print stream object
    	try {
    		// Create a new file output stream
    		// connected to filename
    		out = new FileOutputStream(filename);
    		// Connect print stream to the output stream
    		p = new PrintStream( out );
    		return (p);
    		}
    		catch (Exception e) 
    		{
    			System.err.println ("Error writing to file");
    			return (p);
    			}
    }
	
// Start main program	
	public static void main(String[] args) throws IOException {
		
		System.out.println("Program to illustrate various input capabilities.");
		p.println("Program to illustrate various input capabilities.");
		
// Input from keyboard using BufferedReader 		
		System.out.println("\n***** Input from keyboard using BufferedReader *****");
		p.println("\n***** Input from keyboard using BufferedReader *****");
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in)); // Defines Buffered stream input as stdin
		System.out.print("Input an integer ending with Enter key: ");
		int bufInteger = Integer.parseInt(stdin.readLine());
		System.out.print("Input a floating point number ending with Enter key: ");
		double bufDouble = Double.parseDouble(stdin.readLine());
		System.out.print("Input a line of text ending with an Enter key: ");
		String bufString = stdin.readLine();
		System.out.print("Input a single character ending with Enter key: ");
		char bufChar = (char)stdin.read();
		System.out.println("" + bufInteger + ", " + bufDouble + ", " + bufString + ", " + bufChar);
		p.println("" + bufInteger + ", " + bufDouble + ", " + bufString + ", " + bufChar);
				

// Input from keyboard using Scanner
		System.out.println("\n***** Input from keyboard using Scanner *****");
		p.println("\n***** Input from keyboard using Scanner *****");
		Scanner scanIn = new Scanner(System.in); // Defines the input stream as scanIn
		String delimiterScan = "\r\n";
		scanIn.useDelimiter(delimiterScan);
		System.out.print("Input an integer ending with Enter key: ");
		int scanInteger = scanIn.nextInt();
		System.out.print("Input a floating point number ending with Enter key: ");
		double scanDouble = scanIn.nextDouble();
		System.out.print("Input a line of text ending with an Enter key: ");
		String scanString = scanIn.next();
		System.out.print("Input a single character ending with Enter key: ");
		char scanChar = scanIn.next().charAt(0);
		System.out.println("" + scanInteger + ", " + scanDouble + ", " + scanString + ", " + scanChar);
		p.println("" + scanInteger + ", " + scanDouble + ", " + scanString + ", " + scanChar);

	
// Input from a file using BufferedReader
		System.out.println("\n***** Input from file using BufferedReader *****");
		p.println("\n***** Input from file using BufferedReader *****");
		String filename = "javaIO.txt"; // Name of file to read -- can have any name
		File scanFile = new File(filename); // Name of file 
		BufferedReader fileInB = new BufferedReader(new InputStreamReader(new FileInputStream(scanFile)));
      	int fileBInteger;
		fileBInteger = Integer.parseInt(fileInB.readLine());
		double fileBDouble = Double.parseDouble(fileInB.readLine());
		String fileBString = fileInB.readLine();
		char fileBChar = (char)fileInB.read();
		System.out.println("" + fileBInteger + ", " + fileBDouble + ", " + fileBString + ", " + fileBChar);
		p.println("" + fileBInteger + ", " + fileBDouble + ", " + fileBString + ", " + fileBChar);
		fileInB.close();


// Input from a file using Scanner
		System.out.println("\n***** Input from file using Scanner *****");
		p.println("\n***** Input from file using Scanner *****");
//		String filename = "javaIO.txt"; // Name of file to read -- can have any name
//		File scanFile = new File(filename); // Name of file 
		scanFile = new File("Newname.txt");
      	Scanner fileIn = new Scanner(scanFile); // Create fileIn to read from filename using Scanner
      	String delimiter = "\r\n"; // need to set the delimiter to carriage return (\r) new line (\n)
      	fileIn.useDelimiter(delimiter); // this sets delimiter so an entire line can be read
      	int fileInteger;
		fileInteger = fileIn.nextInt();
		double fileDouble = fileIn.nextDouble();
		String fileString = fileIn.next();
		char fileChar = fileIn.next().charAt(0);
		System.out.println("" + fileInteger + ", " + fileDouble + ", " + fileString + ", " + fileChar);
		p.println("" + fileInteger + ", " + fileDouble + ", " + fileString + ", " + fileChar);
		fileIn.close();

	}	
}