import java.text.DecimalFormat;
import java.util.StringTokenizer;
import java.util.Vector;
import java.util.Collections;
import java.util.Iterator;
import uwcse.io.Input;

/**
 * Illustrating the use of loops
 */

public class Loops {

    /**
	 * Draw a rectangle of stars
	 * @param lines the number of lines of the rectangle
	 * @param cols the number of columns of the rectangle
	 */
	public void drawARectangleOfStars(int lines, int cols)
	{
		for(int line=1; line<=lines; line++)
		{
			// if 1 statement only,{ and } are optional
			// print cols "*"
			for(int col=1; col<=cols; col++)
				System.out.print("*");
			// next line
			System.out.println();
		}
    }

    /**
	 * Draw a rectangle triangle of stars (right angle in the lower left)
	 * @param lines the number of lines of the triangle
	 */
	public void drawATriangleOfStars1(int lines)
	{
		for(int line=1; line<=lines; line++)
		{
			// print line "*"
			for(int col=1; col<=line; col++)
				System.out.print("*");
			// next line
			System.out.println();
		}

	}

    /**
	 * Draw a rectangle triangle of stars (right angle in the lower right)
	 * @param lines the number of lines of the triangle
	 */
	public void drawATriangleOfStars2(int lines)
	{
		for(int line=1; line<=lines; line++)
		{
			//print lines-line spaces
		    for (int col=1; col<=lines-line; col++)
				System.out.print(" ");
			// print line "*"
		    for(int col=1; col<=line; col++)
				System.out.print("*");
			// next line
			System.out.println();
		}
	}

	/**
	 * Don't use a double to count in a loop
	 */
	public void countingWithADouble()
	{
		DecimalFormat d;
		// Display with 15 digits
		d = new DecimalFormat("0.000000000000000");
		for(double x=0; x<10; x+=0.2)
			System.out.println("x="+d.format(x));
	}

	/**
	 * Parse a String (print every word of a String separated by whitespaces)<br>
	 * E.g. if s is "Hello, how are you?", the words "Hello,", "how", "are", "you?"
	 * are printed (one on each line).
	 * @param s the String to parse
	 */
	public void parseAString(String s)
	{
	    StringTokenizer st = new StringTokenizer(s);
	    // By default, st uses a whitespace delimeter
		// for parsing (other options are available)
	    while(st.hasMoreTokens())
		    System.out.println(st.nextToken());
	}

	/**
	 * Input, sort and print a list of integers<br>
	 * (using some of the libraries of Java)<br>
	 * We will see Collections by the end of the quarter.
	 */
	public void inputSortAndPrint()
	{
		// Ordering a list of positive integers
		Vector v = new Vector(); //an implementation of
		                         //a list (in java.util)
		int i;
		Input input = new Input();

		// Get the integers
		do{
			i=input.readInt("Enter an integer(<0 to stop): ");
			if (i>=0) v.add(new Integer(i)); //use a wrapper
		}while(i>=0);

		// Order the collection
		Collections.sort(v); //in java.util

		// Iterate through the collection and print it
		Iterator it = v.iterator(); //in java.util
		while(it.hasNext())
			System.out.print(it.next()+" ");

		// Blank line for a nice output
		System.out.println();
	}
}