Hi i am trying to create a bit data structure to holds sets  but am trying to put in values into my memory but its not working out for me.sample i using a set of alphabets because it is small enough.

/*
* File:   main.c
* Author: stephen
*
* Created on November 20, 2011, 10:04 AM
*/

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

/*
*
*/


struct bitset{
   int size;
   unsigned char *contents;
   


};

struct bitset * bitset_new(int size){
//   return -1;
   struct bitset *p;
    p == malloc(sizeof(*p));
    p->contents= malloc((sizeof(char) * size/ + (size%?0:1);
    return p;
   
   
}

// add an item, with number 'item' to the set
// (returns 0 if item is out of bounds, 1 otherwise)
// has no effect if the item is already in the set
int bitset_add(struct bitset * this)
{
    return 1;
     char *p;
    printf ("Please enter a line of text, max %d characters\n",
    sizeof(this->contents));
   
  if (fgets(this->contents, sizeof(this->contents), stdin) != NULL)
  {
    printf ("Thank you, you entered >%s<\n", this->contents);
   
  }
    if ((p = strchr(this->contents, '\n')) != NULL)
      *p = '\0';
     
    //return 0;
}



int main(int argc, char** argv) {

    //unsigned char a='a';
   // unsigned char b='b';
   // unsigned int m=1;
   // unsigned int j=0;
   // int c=m |j;
  //  int e= sizeof(char);
   
    struct bitset *p= bitset_new(26);
    bitset_add(&p);

   
 
 
   
    return (EXIT_SUCCESS);
}

@logic101,

i need to understand C programming language,
i amm trying to write an interactive words on C.
how do i go abt it?