/* StringManipulate
 * <Description>
 * Various string manipulation methods.
 * 
 * <Usage>
 * %javac StringManipulate.java
 * %java String Manipulate Butties
 * 1
 * BUTTIES
 * seittuB
 *
 * %java StringManipulate 1 Butties.jpg
 * .jpg
 * 
 * <References>
 * CIS-201L Dr. Sloan Lab 8
 * @author
 * Dan Latham
 * <l3li3l@torguard.tg>
 * @version 0.0.1
 *
 */
public class StringManipulate
{
	//Returns occurence of letter e in string
	public static int occurrence(String string)
	{
		int count = 0;
		int leng = string.length();
		char[] str = new char[leng];
		string.getChars(0,leng, str, 0);
		for (int i = 0; i < leng; i+=1)
		{
			if (str[i] == 'e') count+=1;
		}
		return count;
	}
	//Returns string as STRING
	public static String upper(String string)
	{
		return string.toUpperCase();
	}
	//Returns string as gnirts
	public static String reverse(String string)
	{
		int leng = string.length();
		int counter = 0;
		char[] str = new char[leng];
		char[] str_new = new char[leng];
		string.getChars(0,leng, str, 0);
		for (int i = leng-1; i >= 0; i-=1)
		{
			str_new[counter] = str[i];
			counter+=1;
		}
		String basic = "";
		for (int i = 0; i < leng; i +=1)
		{
			basic += str_new[i];
		}
		return basic;
	}
	//Returns file ext of file.jpg as .jpg
	public static String filext(String string)
	{
		int leng = string.length();
		char[] str = new char[leng];
		String stringext = "";
		string.getChars(0,leng, str, 0);
		int i = leng-1;
		while (i >= 0)
		{
			stringext += str[i];
			//System.out.println(stringext);
			if (str[i] == '.')
			{
				i = -1;
				return reverse(stringext);
			}
			i -= 1;
		}
		
		return "No File Extension Found in Filename";
	}
	public static void main(String[] args)
	{
		try
		{
			Integer.parseInt(args[0]);
			String c = args[1];
			System.out.println(filext(c));
		}
		catch (NumberFormatException j)
		{
			System.out.println(occurrence(args[0]));
			System.out.println(upper(args[0]));
			System.out.println(reverse(args[0]));
		}
	}
}