#include<iostream>
#include<cstring>
using namespace std;

// average word length
float average_word_length(const char *string){
	int current_word_length = 0;
	int word_count = 0;
	int letter_total = 0;
	for(int i = 0; string[i]; i++){
		if(string[i] == ' '){
			// We finished a word
			word_count++;
			letter_total += current_word_length;
			current_word_length = 0;
		}
		else
			current_word_length++;
	}
	if(current_word_length){
		letter_total += current_word_length;
		word_count++;
	}
	return (float)letter_total / word_count;
}

// convert to title case
void title_case(char *string){
	if(islower(*string)) // Could also call it string[0]
		*string = toupper(*string);
	for(string++; *string; string++)
		if(*(string - 1) == ' ')
			*string = toupper(*string);
		else if(isalpha(*string))
			*string = tolower(*string);
}

// encrypt with shift of 13
void encrypt(char *string){
	for(;*string; string++)
		if(isalpha(*string)){
			if(islower(*string)){
				if(*string + 13 > 'z')
					*string -= 26;
				*string += 13;
			}
			else {
				if(*string + 13 > 'Z')
					*string -= 26;
				*string += 13;
			}
		}
	
}

int main(){
	char phrase[] = "There was once a fish that fell off a roof into an Apple";
	const char *phrase2 = "A monkey caught the fish and put it in a bucket";

	phrase[5] = 'Z';

	cout << phrase << endl;

//	phrase2[5] = 'Z'; // Causes segfault
	cout << phrase2 << endl;
	
	cout << average_word_length("bear goat deer") << endl;
	cout << "Phrase average word length:  " << average_word_length(phrase) << endl;

	title_case(phrase);
	cout << "Phrase, in title case:  " << phrase << endl;

	//title_case("this is a string"); // Can't edit a static string
	
	encrypt(phrase);
	cout << "Encrypted:  " << phrase << endl;
	encrypt(phrase);
	cout << "Decrypted:  " << phrase << endl;

	return 0;
}