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

public class FilesOfNumbers2 {
	
	public static void createFileOfRandomIntegers(String outputFileName)
														throws IOException {
		
		PrintWriter outputStream;
		outputStream = new PrintWriter(new FileWriter(outputFileName));
		
		int numberOfIntegers = (int)(Math.random() * 100) % 10 + 10;
		outputStream.println(numberOfIntegers);
		for(int i = 0; i < numberOfIntegers; i++)
			outputStream.println((int)(Math.random() * 1000) % 100 + 10);
		
		outputStream.close();
	}
	
	public static void createFileOfSquaresAndSqrs(String inputFileName,
									String outputFileName)throws IOException {
		
		BufferedReader inputStream;
		inputStream = new BufferedReader(new FileReader(inputFileName));
		
		PrintWriter outputStream;
		outputStream = new PrintWriter(new FileWriter(outputFileName));
		
		Scanner s = new Scanner(inputStream);
		int n = s.nextInt();
		outputStream.println("The number of integers: " + n);
		
		for(int i = 0; i < n; i++){
			int number = s.nextInt();
			outputStream.println("     number = " + number);
			outputStream.println("     sqrt(" + number + ")=" + Math.sqrt(number));
			outputStream.println("     square(" + number + ")=" + number * number);
		}
		
		s.close();
		inputStream.close();
		outputStream.close();
	}
	
	public static void createFileFromTwoFiles(String inputFileName1,
			String inputFileName2,String outputFileName) throws IOException {
				
		System.out.println("Not implemented!");	
	}	

	public static void copyFileToTheStandardOutput(String inputFileName)
														throws IOException {
		System.out.println("Not implemented!");
	}
		
	public static void main(String[] args)throws IOException{
		
		String s = File.separator;
		
		String usrDir = System.getProperty("user.dir");
		System.out.println("usrDir: " + usrDir);
		
		System.out.println("Method createFileOfRandomIntegers works!");		
		createFileOfRandomIntegers(usrDir + s + "randomIntegers.txt");
		
		System.out.println("Method createFileOfSquaresAndSqrs works!");	
		createFileOfSquaresAndSqrs(usrDir + s + "randomIntegers.txt",
								   usrDir + s + "randomDoubles.txt");
								   
		System.out.println("Method createFileOfSquaresAndSqrs works!");					   
		createFileOfSquaresAndSqrs(usrDir + s + "myIntegers.txt",
								   usrDir + s + "myDoubles.txt");
								   
		System.out.println("Method createFileFromTwoFiles is not implemented!");	
		createFileFromTwoFiles(usrDir + s + "randomIntegers.txt",
							   usrDir + s + "myIntegers.txt",
							   usrDir + s + "integers.txt");
							   
		System.out.println("Method copyFileToTheStandardOutput is not implemented!");
		copyFileToTheStandardOutput(usrDir + s + "integers.txt");				
	}		
}
/*
	public static void main(String[] args)throws IOException{
		createFileOfRandomIntegers("randomIntegers.txt");
		createFileOfSquaresAndSqrs("randomIntegers.txt","randomDoubles.txt");
		createFileOfSquaresAndSqrs("myIntegers.txt","myDoubles.txt");
		createFileFromTwoFiles("randomIntegers.txt","myIntegers.txt","integers.txt");
		copyFileToTheStandardOutput("integers.txt");				
	}
*/