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c_cpp
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#include <iostream>

void input_text(char** str, int& lenght);
void input_int(int& a);
void input_str(char* str);
bool check_end(char* str);
void find_and_replace_words_in_string(char* str);
void replace_word(char* str, char* substr, int left, int right, int n);
void write_text(char** text, int lenght);
void delete_text(char** text);
int strlen(char* str);
void turn_all_chars_left(char* str, int left, int turn);
void turn_all_chars_right(char* str, int left, int turn);
void check_exit(bool& exit);

int main()
{
	std::cout << "The task was completed by a student of the 353505 group - Denis Anufriev\n\n"
		<< "The program processes an array of strings (the length of each string is no more than 100 characters).\n"
		<< "If a string contains a sequence of identical characters, the program replaces them with code 255,\n"
		<< "followed by the code of this character and the number of identical characters..\n\n";

	bool exit;

	check_exit(exit);

	while (!exit)
	{
		int lenght;
		char* str = new char[1001];
		char** text = new char* [100];
		for (int i = 0; i < 100; i++) text[i] = new char[1000];

		std::cout << "Enter your text (if you have finished typing, type 'end.' in the last separate line)\n";
		input_text(text, lenght);

		for (int i = 0; i < lenght; i++)
		{
			find_and_replace_words_in_string(text[i]);
		}

		write_text(text, lenght);

		delete_text(text);

		check_exit(exit);
	}

	return 0;
}

void input_text(char** str, int& lenght)
{
	bool isTyping = true;

	for (int i = 0; isTyping; i++)
	{
		bool isCorrect;
		int index = 0;
		char c = getchar();

		do
		{
			isCorrect = true;
			str[i][index] = c;
			index++;

			if (index > 100)
			{
				isCorrect = false;
				index = 0;
				while ((c = getchar()) && c != '\n');
				std::cout << "The number of characters in a line of text exceeds 100 characters!\n";
			}
		} while (((c = getchar()) && c != '\n') || !isCorrect);

		str[i][index] = '\0';

		if (check_end(str[i]))
		{
			isTyping = false;
			lenght = i;
		}
	}
}
void input_int(int& a)
{
	char* str = new char[1001]();
	bool isIncorrect;

	do
	{
		isIncorrect = false;

		input_str(str);

		for (int i = 0; str[i] != '\0'; i++)
		{
			if ((str[i] > '9' || str[i] < '0') && str[i] != '+')
			{
				std::cout << "You entered a non-natural number! Repeat the input: ";
				isIncorrect = true;
				break;
			}
		}

		a = atoi(str);
	} while (isIncorrect);


}
void input_str(char* str)
{
	bool isCorrect;
	int index = 0;
	char c = getchar();

	do
	{
		isCorrect = true;
		str[index] = c;
		index++;

		if (index > 1000)
		{
			isCorrect = false;
			index = 0;
			while ((c = getchar()) && c != '\n');
			std::cout << "The number of characters in a string exceeds 1000 characters!\n";
		}
	} while (((c = getchar()) && c != '\n') || !isCorrect);

	str[index] = '\0';
}
void find_and_replace_words_in_string(char* str)
{
	bool isOkay = true, searching_left = true, searching_right = true;
	int left = 0, right = 0;
	char symbol;
	char* substr = new char[300]();

	for (int i = 0; isOkay; i++)
	{
		if (str[i] != '\0')
		{
			if (searching_left && str[i + 1] == str[i])
			{
				symbol = str[i];
				left = i;
				searching_left = false;
			}
			else if (!searching_left && searching_right)
			{
				if (str[i] == symbol)
				{
					right = i;
				}
				else searching_right = false;
			}
		}
		else if ((str[i] == '\0') && !searching_left && searching_right)
		{
			searching_right = false;
			if (str[i] == '\0') isOkay = false;
		}

		if (!searching_left && !searching_right)
		{
			int value = right - left + 1;
			if (value > 1)
			{
				substr[0] = char(255);
				substr[1] = symbol;

				if (value < 10)
				{
					substr[2] = (char(value) + '0');
					substr[3] = '\0';
				}
				else if (value >= 10 && value < 100)
				{
					substr[2] = (char(value / 10) + '0');
					substr[3] = (char(value % 10) + '0');
					substr[4] = '\0';
				}
				else
				{
					substr[2] = '1';
					substr[3] = '0';
					substr[4] = '0';
					substr[5] = '\0';
				}

				replace_word(str, substr, left, right, value);

				if (strlen(substr) < value)
				{
					i -= (value - strlen(substr));
				}
				else if (strlen(substr) > value)
				{
					i += (strlen(substr) - value);
				}
			}
			searching_left = true;
			searching_right = true;
		}
	}
}
int strlen(char* str)
{
	bool search = true;
	int lenght;

	for (int i = 0; search; i++)
	{
		if (str[i] == '\0')
		{
			search = false;
			lenght = i;
		}
	}

	return lenght;
}
void turn_all_chars_left(char* str, int left, int turn)
{
	bool isOkay = true;

	for (int i = left; isOkay; i++)
	{
		str[i] = str[i + turn];
		if (str[i] == '\0')
		{
			str[i + turn] = 'a';
			isOkay = false;
		}
	}
}
void turn_all_chars_right(char* str, int left, int turn)
{
	bool isOkay = true;

	for (int i = strlen(str) + turn; isOkay; i--)
	{
		str[i] = str[i - turn];
		if (i - turn == left) isOkay = false;
	}
}
void replace_word(char* str, char* substr, int left, int right, int n)
{
	int lensubstr = strlen(substr);

	if (lensubstr == n)
	{
		for (int i = left; i <= right; i++)
		{
			str[i] = substr[i - left];
		}
	}
	else if (lensubstr < n)
	{
		for (int i = left; i <= left + (lensubstr - 1); i++)
		{
			str[i] = substr[i - left];
		}
		turn_all_chars_left(str, left + lensubstr, n - lensubstr);
	}
	else if (lensubstr > n)
	{
		turn_all_chars_right(str, right + 1, lensubstr - n);

		for (int i = left; i <= left + (lensubstr - 1); i++)
		{
			str[i] = substr[i - left];
		}
	}
}
void write_text(char** text, int lenght)
{
	std::cout << "The received text:\n";

	for (int i = 0; i < lenght; i++)
	{
		for (int j = 0; text[i][j] != '\0'; j++)
		{
			std::cout << text[i][j];
		}
		std::cout << '\n';
	}
}
void delete_text(char** text)
{
	for (int i = 0; i < 100; i++)
	{
		delete[] text[i];
	}
	delete[] text;
}
bool check_end(char* str)
{
	if (strncmp(str, "end.", 4) == 0) return true;
	else return false;
}
void check_exit(bool& exit)
{
	int check_exit = -1;

	std::cout << "Enter 1 to start executing the program function.\nEnter 0 to exit the program\n\n";

	while (check_exit != 0 && check_exit != 1)
	{
		input_int(check_exit);
		if (check_exit != 0 && check_exit != 1) std::cout << "You entered neither 1 nor 0!\n";
	}

	exit = (check_exit) ? false : true;
}
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