// Program file: stats.cpp

#include <iostream.h>

#include "boolean.h"

#include "cstrlib.h"

// Function: analyze_sentence
// Computes and display statistics for a sentence entered at the keyboard

void analyze_sentence();

// Function: update_statistics
// Updates longest word, word count, and character count
//
// Inputs: current input word, the longest word, a word count, a character count
// Outputs: the longest word, a word count, a character count

void update_statistics(string word, string &longest_word, int &word_count,
	int &char_count);

// Function: display_statistics
// Displays longest word, word count, and character count, and average length of
// words in a sentence
//
// Inputs: the longest word, a word count, a character count

void display_statistics(string longest_word, int word_count, int char_count);

void main()
{
	char query;
	do
	{
		cout << "Enter a sentence [terminating with a period ('.')]: ";
		analyze_sentence();
		cout << "Run once more? [Y/N]: ";
		cin >> query;
	} while ((query == 'Y') || (query == 'y'));
}

void analyze_sentence()
{
	string word, longest_word;
	int word_count, char_count;

	word_count = 0;
	char_count = 0;
	do
	{
		cin >> word;
		update_statistics(word, longest_word, word_count, char_count);
	} while (word.nth_char(word.length()) != '.');
	display_statistics(longest_word, word_count, char_count);
} 

void update_statistics(string word, string &longest_word, int &word_count,
	int &char_count)
{
	int length = word.length();

	if (length > longest_word.length())
		longest_word = word;
	++word_count;
	char_count = char_count + length;
}

void display_statistics(string longest_word, int word_count, int char_count)
{
	cout << endl << "Number of words: " << word_count << endl;
	cout << "Number of characters: " << char_count << endl;
	cout << "Average length of a word: " << char_count / word_count << endl;
	cout << "Longest word: " << longest_word << endl << endl;
}