Main

#include <iostream>	
#include <cassert>	
#include <string>	
using namespace std;

const char EOI('.');	
const char EOT('#');	
const int  MAX(10);	

int main() {
	char readInCommand();
	void executeCommand(char, char[]);
	void displayMenu();

	char text[MAX + 1] = { EOT };	

	displayMenu();
	char command(readInCommand());
	while (command != '0')
	{
		executeCommand(command, text);
		displayMenu();
		command = readInCommand();
	}
	cout << "\n\n";
	system("pause");	
	return 0;
}

void displayMenu() {
	cout << "\n\n\n           ________MENU________\n";
	cout << "\n STOP                                    0";
	cout << "\n Input text                              1";
	cout << "\n Output text                             2";
	cout << "\n Length of text                          3";
	cout << "\n Put text in uppercase                   4 - Works";
	cout << "\n Count duplicates of given letter        5 - Works";
	cout << "\n Remove all occurrences of given letter  6 - Sort of Works?";
}

char readInCommand() {
	cout << "\n\nENTER YOUR COMMAND: ";
	string contents;	
	getline(cin, contents);
	return toupper(contents[0]);	
}

void executeCommand(char option, char text[]) {
	void readInText(char text[], int size);
	void printOutText(const char text[]);
	void putInUppercase(char text[]); // For Option 4
	int countOccurrences(const char text[], char letter); // For Option 5
	char removeAllOccurrences(char text[], char letter); // For Option 6
	char readInLetter(); 
	bool isValidText(const char text[]);
	int length(const char[]);

	assert(isValidText(text)); 

	switch (option)
	{
		//Option 1
	case '1':	
		readInText(text, MAX);
		break;

		//Option 2
	case '2':	
		printOutText(text);
		break;

		//Option 3
	case '3':	
		cout << "\nThere are " << length(text) << " letters in text";
		break;

		//Option 4
	case '4':	
		cout << "\n";
		putInUppercase(text);
		break;

		//Option 5
	case '5':	
		{
		const char letter(readInLetter());
		int numberOfOccurrences(countOccurrences(text, letter));
		cout << "\nThe text contains " << numberOfOccurrences << " duplicate(s) of the letter '" << letter << "'\n";
		}
		break;

		//Option 6
	case '6':	
		{
		const char letter(readInLetter());
		char removeAllOccurrence(char text, char letter);
		}

		break;

	default:		cout << "\nNOT IMPLEMENTED YET OR INVALID COMMAND, TRY AGAIN";
	}
}

bool isValidText(const char text[]) {
	bool found(false);
	int pos(0);
	while ((pos <= MAX) && (!found)) {
		if (text[pos] == EOT)
			found = true;
		++pos;
	}
	return found;
}
char readInLetter() {
	cout << "\nEnter a letter: ";
	string contents;	
	getline(cin, contents);	
	return contents[0];	
}

//Option 1
void readInText(char text[], int size) {
	cout << "\nEnter the text (ending with '.'): ";
	string contents;	
	getline(cin, contents);
	
	int index(0);
	char character(contents[index]);
	while ((character != EOI) && (index < size)) {
		text[index] = character;
		++index;
		character = contents[index];
	}
	
	text[index] = EOT;
}

//Option 2
void printOutText(const char text[]) {
	assert(isValidText(text)); 
	cout << "\nThe text is: ";
	int index(0);
	while (text[index] != EOT) {
		cout << text[index];
		++index;
	}
	cout << endl;
}

//Option 3
int length(const char text[]) {
	assert(isValidText(text)); 
	int index(0);
	while (text[index] != EOT)
		++index;
	return index;
}

//Option 4
void putInUppercase(char text[])
{
	for (int i = 0; text[i]!= EOT; i++)
	{
		text[i] = toupper(text[i]);		
		cout << text[i];
	}
}

//Option 5
int countOccurrences(const char text[], char letter)
{
	int numberOfOccurrences(0);
	int i(0);
	while (text[i] != EOT)
	{
		if (text[i] == letter)
		{
			numberOfOccurrences++;
		}
		i++;
	}
	return numberOfOccurrences;
}

// Option 6
void removeAllOccurrence(char text[], char letter)
{

}