/* C++ Programming, Example answer, Exercise 2, Sheet 5  */

/* Author: Rob Miller and William Knottenbelt
   Program last changed: 30th September 2023    */

/* This program outputs itself to the screen and to the 
   file 'WithoutComments.cpp', but without comments. */

/* IMPORTANT: TO GUARANTEE THAT THIS PROGRAM RUNS, PUT THE PROJECT 
   DOCUMENT (FILE) IN THE SAME FOLDER/DIRECTORY AS THIS FILE        */

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

const int False = 0;
const int True = 1;
	
int main() 
{
	char character;
	char character_after;
	int inside_comment = False;
	ifstream in_stream;
	ofstream out_stream;
	
	/* Output test statement to the screen: */
	cout << "Testing: " << 16/2 << " = " << 4*2 << ".\n\n";
	
	in_stream.open("Sheet5Ex2.cpp");
	out_stream.open("WithoutComments.cpp");
	
	in_stream.get(character);
	
	for ( ; ! in_stream.fail() ; ) /* alternative: 'while (! in_stream.eof())' */
	{
		/* Test to see if a comment is starting. */
		if (inside_comment == False && character == '/') 
		{
			in_stream.get(character_after);  /* get the next character, ...  */
			if (character_after == '*')		 /* see if it's a '*', ...  */
				inside_comment = True;       /* if so, set flag to 'True', ... */
			else 
				in_stream.putback(character_after); /* if not, put the character back. */ 
		}
		/* End test */
		
		/* Test to see if a comment is finishing. */
		if (inside_comment == True && character == '*')
		{
			in_stream.get(character);
			if (character == '/')
			{
				inside_comment = False;   /* set flag to 'False' ... */
				in_stream.get(character); /* and get the first character after the comment */
			}
		}
		/* End test */
	
		/* Output the character if it's not inside a comment */
		if (inside_comment == False)
		{ 
			out_stream.put(character);  /* output to the file ... */
			cout << character;          /* ... and to the screen */
		}
		
		/* get the next character, ready to repeat the above process */
		in_stream.get(character);
	}
	
	in_stream.close();
	out_stream.close();
							
	return 0;
}