/*
CSE 142, Spring 2010
This program prompts the user for text until a given special
"sentinel" value is typed, then displays the sum of the
lengths of the text.

This is an example of a sentinel loop, which is also
an example of a fencepost problem.

Example output:
Type a line (or "quit" to exit): hello
Type a line (or "quit" to exit): this is a line
Type a line (or "quit" to exit): quit
You typed a total of 19 characters.
*/

import java.util.*;  // for Scanner

public class Sentinel {
	public static final String SENTINEL = "quit";

	public static void main(String[] args) {
		Scanner console = new Scanner(System.in);
		
		// read text from scanner until we see the sentinel
		// any variable(s) used in your while loop test must be declared BEFORE the loop header
		int sum = 0;

      		// fencepost loop; move one "post" out of the loop
      		// "posts" - prompt/read a line
		// "wires" - add the line lengths to a cumulative sum
		System.out.print("Type a line (or \"" + SENTINEL + "\" to exit): ");
		String response = console.nextLine();
		
		while (!response.equals(SENTINEL)) {
			sum += response.length();
			System.out.print("Type a line (or \"" + SENTINEL + "\" to exit): ");
			response = console.nextLine();
		}
		
		System.out.println("You typed a total of " + sum + " characters.");
	}
}