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100%Mean logprob: -0.41166763426801306 (66.25%)
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#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include "list.h"
#ifdef UNIT_TESTING
/* Redirect printf to a function in the test application so it's possible to
* test the standard output. You can ignore this; it's not relevant to the
* assignment. */
#ifdef printf
#undef printf
#endif /* printf */
extern int test_printf(const char *format,...);
#define printf test_printf
#endif
#define MAX_ITEM_PRINT_LEN 100
// Note: All list_ functions should return a status code
// EXIT_FAILURE or EXIT_SUCCESS to indicate whether the operation was
// successful or not.
// create a new list
int list_init(node **head)
{
*head = NULL;
return EXIT_SUCCESS;
}
// print a single list item to an externally allocated string
// This should be in the format of:
// "quantity * item_name @ $price ea", where item_name is a string and
// price is a float formatted with 2 decimal places.
int list_item_to_string(node *head, char *str) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
if(head == NULL){
return EXIT_SUCCESS;
}
sprintf(str, "%d * %s @ $%0.2f ea", head->quantity, head->item_name, head->price);
// if(!){
// return EXIT_FAILURE;
// }
return EXIT_SUCCESS;
}
// print the list to stdout
// This should be in the format of:
// "pos: quantity * item_name @ $price ea", where
// pos is the position of the item in the list,
// item_name is the item_name of the item and
// price is the float price of the item formatted with 2 decimal places.
// For example:
// """1: 3 * banana @ $1.00 ea
// 2: 2 * orange @ $2.00 ea
// 3: 4 * apple @ $3.00 ea
// """
// It should return a newline character at the end of each item.
// It should not have a leading newline character.
int list_print(node *head) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
int i = 1;
while(head){
char buffer[100];
list_item_to_string(head, buffer);
printf("%d: %s\n", i, buffer);
i++;
head = head->next;
}
return EXIT_SUCCESS;
}
// add a new item (name, price, quantity) to the list at position pos,
// such that the added item is the item at position pos
// For example:
// If the list is:
// 1: 3 * banana @ $1.00 ea
// 2: 2 * orange @ $2.00 ea
// and you call list_add_item_at_pos(&head, "apple", 3.0, 4, 2)
// the list should be:
// 1: 3 * banana @ $1.00 ea
// 2: 4 * apple @ $3.00 ea
// 3: 2 * orange @ $2.00 ea
int list_add_item_at_pos(node **head, char *item_name, float price, int quantity, unsigned int pos)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
int i = 1;
node* _head = *head;
node* _prev = NULL;
while(_head && i < pos){
i++;
_prev = _head;
_head = _head->next;
}
node* new_node = (struct _node*) malloc(sizeof(struct _node));
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
new_node->next = NULL;
if(_prev){
_prev->next = new_node;
}
new_node->next = _head;
if(pos==1){
*head = new_node;
}
return EXIT_SUCCESS;
}
// update the item at position pos
int list_update_item_at_pos(node **head, char *item_name, float price, int quantity, unsigned int pos) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
int i = 1;
node* _head = *head;
while(_head && i < pos){
i++;
_head = _head->next;
}
if(!_head && i < pos){
return EXIT_FAILURE;
}
_head->item_name = item_name;
_head->price = price;
_head->quantity = quantity;
return EXIT_SUCCESS;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
int i = 1;
node* _head = *head;
node* _prev = NULL;
while(_head && i < pos){
i++;
_prev = _head;
_head = _head->next;
}
if(!_head && i < pos){
return EXIT_FAILURE;
}
if(!_prev){
*head = _head->next;
return EXIT_SUCCESS;
}
_prev->next = _head->next;
return EXIT_SUCCESS;
}
// swap the item at position pos1 with the item at position pos2
int list_swap_item_positions(node **head, int pos1, int pos2) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
int i = 1;
node* _head1 = *head;
node* _prev1 = NULL;
int small_pos = pos1 < pos2? pos1 : pos2;
int large_pos = pos1 > pos2? pos1 : pos2;
while(_head1->next && i < small_pos){
i++;
_prev1 = _head1;
_head1 = _head1->next;
}
i = 1;
node* _head2 = *head;
node* _prev2 = NULL;
while(_head2->next && i < large_pos){
i++;
_prev2 = _head2;
_head2 = _head2->next;
}
_prev2->next = _head1;
node* tmp = _head1->next;
_head1->next = _head2->next;
_head2->next = tmp;
if(_prev1){
_prev1->next = _head2;
}
if(small_pos==1)
*head = _head2;
return EXIT_SUCCESS;
}
// find the item position with the highest single price
int list_find_highest_price_item_position(node *head, int *pos)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
node* _head = head;
float max_price = head->price;
*pos = 1;
int i = 0;
while(_head){
i++;
if(max_price < _head->price){
max_price = _head->price;
*pos = i;
}
_head = _head->next;
}
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
*total = 0.0;
node* _head = head;
while(_head){
*total += (_head->price * _head->quantity);
_head = _head->next;
}
return EXIT_SUCCESS;
}
// save the list to file filename
// the file should be in the following format:
// item_name,price,quantity\n
// (one item per line, separated by commas, and newline at the end)
int list_save(node *head, char *filename)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
node* _head = head;
if(!_head){
return EXIT_FAILURE;
}
FILE* fp;
fp = fopen(filename, "a+");
if(!fp){
return EXIT_FAILURE;
}
while(_head){
fprintf(fp, "%s,%0.2f,%d\n",_head->item_name, _head->price, _head->quantity);
_head = _head->next;
}
fclose(fp);
return EXIT_SUCCESS;
}
// load the list from file filename
// the file should be in the following format:
// item_name,price,quantity\n
// (one item per line, separated by commas, and newline at the end)
// the loaded values are added to the end of the list
int list_load(node **head, char *filename)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
node* _head = *head;
while(_head && _head->next){
_head = _head->next;
}
FILE* fp;
fp = fopen(filename, "r");
if(!fp){
return EXIT_FAILURE;
}
char line[100];
while(fgets(line, 100, fp)!= NULL){
char* tmp;
node* new_node = (struct _node*) malloc(sizeof(struct _node));
tmp = strtok(line,",");
new_node->item_name = (char*)malloc(strlen(tmp)+1);
strcpy(new_node->item_name, tmp);
tmp = strtok(NULL,",");
new_node->price = atof(tmp);
tmp = strtok(NULL,",");
new_node->quantity = atoi(tmp);
new_node->next = NULL;
if(_head)
_head->next = new_node;
_head = new_node;
if(*head == NULL){
*head = new_node;
}
}
fclose(fp);
return EXIT_SUCCESS;
}
// de-duplicate the list by combining items with the same name
// by adding their quantities
// The order of the returned list is undefined and may be in any order
int list_deduplicate(node **head)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
node* _head1 = *head;
while(_head1 && _head1->next){
node* _head2 = _head1->next;
node* _prev = _head1;
while(_head2){
int to_free = 0;
if(!strcmp(_head1->item_name, _head2->item_name)){
_head1->quantity += _head2->quantity;
_prev->next = _head2->next;
to_free = 1;
}
if(to_free){
node* tmp = _head2;
_head2 = _head2->next;
free(tmp);
} else {
_prev = _head2;
_head2 = _head2->next;
}
}
_head1 = _head1->next;
}
return EXIT_SUCCESS;
}