Hangman Game - Storing variables and such

[denZer]

I will have to eventually use an array called "guessed_letters" (which a character is added with each guess) but in the mean time, I am using char user_guesses to store the temporary chars, but how can I add it to the array of guessed_letter later on?

main function looks like this:

{
	int i;
	int position_of_letter;
	FILE *inp;
	char word_to_be_guessed[SIZE];
	char word_in_progress[SIZE];
	char guessed_letter[SIZE];
	char length;
	char user_guesses;
	//guesses of user starts from 0	
	i=0;
	inp=fopen("words.txt", "r");
	fscanf(inp," %s", word_to_be_guessed);
	length=strlen(word_to_be_guessed);
	Instructions();
	MysteriousWord(word_to_be_guessed,word_in_progress);
	do
	{
		user_guesses=GetGuess();
		{
		position_of_letter=CheckLetter(user_guesses,word_to_be_guessed);
		if(position_of_letter<0)
		{
			printf("The letter you guessed is incorrect, please try again: \n");
			MysteriousWordUnveiled(word_to_be_guessed,word_in_progress,position_of_letter);
		}
		}
	}
	while(position_of_letter<0);
	{ 
		printf("You guessed one right!\n");
		MysteriousWordUnveiled(word_to_be_guessed,word_in_progress,position_of_letter);
	}
}

Would it be easier to just create a user defined function?