Sams Teach Yourself C in 21 Days

164: cur_ptr = first;

165: while (cur_ptr != NULL )

166: {

167: printf(“ %X “, cur_ptr );

168: printf(“ %2i %c”, counter++, cur_ptr->ch);

169: printf(“ %X \n”,cur_ptr->next_rec);

170: cur_ptr = cur_ptr->next_rec;

171: }

172: }

173:

174: /*========================================================*

175: * Function: free_memory_list

176: * Purpose : Frees up all the memory collected for list

177: *========================================================*/

178:

179: void free_memory_list(LISTPTR first)

180: {

181: LISTPTR cur_ptr, next_rec;

182: cur_ptr = first; /* Start at beginning */

183:

184: while (cur_ptr != NULL) /* Go while not end of list */

185: {

186: next_rec = cur_ptr->next_rec; /* Get address of next record */

187: free(cur_ptr); /* Free current record */

188: cur_ptr = next_rec; /* Adjust current record*/

189: }

190: }

Enter character 1,

Must be a to z: q

Enter character 2,

Must be a to z: b

Enter character 3,

Must be a to z: z

Enter character 4,

Must be a to z: c

Enter character 5,

Must be a to z: a

Rec addr Position Data Next Rec addr

======== ======== ==== =============

2224A0 1 a 222470

222470 2 b 222490

430 Day 15

LISTING15.13 continued

INPUT/

OUTPUT

25 448201x-CH15 8/13/02 11:13 AM Page 430