c file IO.c

#include <stdio.h>
#include <stdlib.h>


int populate( char word_array[40][15] )
{
	FILE *words;
	int end;
	
	/* open the file */
	words = fopen( "file.txt", "r" );

	/* if the file doesn't exists, don't run the program */
	if( words == 0 )
	{
		printf("CANNOT OPEN\n");
		exit(1);
	}

	/* 'i' will track the total amount of words */
	int i = 0;

	/* real each word, stop at the EOF (end of file) */
	for (i = 0; fscanf(words, "%s", word_array[i] ) != EOF ; ++i);
	
	/* close the file, you're done reading it */
	fclose( words );
	
	/* the amount of words read */
	return i - 1;
}

void showit(int size, char words[40][15])
{
	int i;
	for (i = 0; i < size; ++i)
	{
		if( words[i][0] != 0 )
			printf("%s\n", words[i]);
	}
}

/* **GOAL** Remove every word WITHOUT duplicates */
void detect(int size, char words[40][15])
{
	int i, j;
	/*  1. check each word */
	for ( i=0; i < size; ++i)
	{	
		/*  3. reset this flag on each new word */
		int match = 0;
		/*  2. against every other word after it */
		for ( j=i+1; j < size; ++j)
		{
			/*  4. if they match, flag them to leave it alone */
			if( !strcmp(words[i], words[j]) )
				match = 1;
		}
		/* 5. if it wasn't flagged delete it */
		if( !match )
			/*  6.  remove the word if there's no duplicate */
			words[i][0] = 0;
	}
}

int main(void)
{
	char word_array[40][15];
	int size = populate( word_array );

	showit( size, word_array );

	detect( size, word_array );

	printf("___________________\n");
	showit( size, word_array );

	return 0;
}