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100%Mean logprob: -0.4636397391669899 (62.90%)
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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) {
if (head == NULL) {
return EXIT_SUCCESS;
}
sprintf(str, "%d * %s @ %.2f ea", head->quantity, head->item_name, head->price);
return EXIT_SUCCESS;
}
// print the entire list to an externally allocated string
// This should be in the format of:
// "item_name item_name item_name...", where item_name is a string
int list_to_string(node *head) {
if (head == NULL) {
return EXIT_SUCCESS;
}
while(head!= NULL) {
printf("%s", head->item_name);
head = head->next;
if(head!= NULL) {
printf(" ");
}
}
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) {
if(head == NULL) {
return EXIT_FAILURE;
}
unsigned int pos = 1;
while(head!= NULL) {
printf("%d: %d * %s @ %.2f ea\n", pos, head->quantity, head->item_name, head->price);
head = head->next;
pos++;
}
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)
{
unsigned int i = 1;
node *prev = NULL;
node *curr = *head;
if(pos == 0)
return EXIT_FAILURE;
while(curr!= NULL) {
if(i == pos) {
node newItem;
newItem.item_name = item_name;
newItem.price = price;
newItem.quantity = quantity;
newItem.next = curr;
if(prev == NULL) {
*head = &newItem;
} else {
prev->next = &newItem;
}
return EXIT_SUCCESS;
}
prev = curr;
curr = curr->next;
i++;
}
return EXIT_FAILURE;
}
// update the item at position pos
int list_update_item_at_pos(node **head, char *item_name, float price, int quantity, unsigned int pos) {
unsigned int i = 1;
node *prev = NULL;
node *curr = *head;
if(pos == 0)
return EXIT_FAILURE;
while(curr!= NULL) {
if(i == pos) {
curr->item_name = item_name;
curr->price = price;
curr->quantity = quantity;
return EXIT_SUCCESS;
}
prev = curr;
curr = curr->next;
i++;
}
return EXIT_FAILURE;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos) {
int i = 1;
node *prev = NULL;
node *curr = *head;
if(pos == 0)
return EXIT_FAILURE;
while(curr!= NULL) {
if(i == pos) {
// If prev is NULL, we are removing the head
if(prev == NULL) {
*head = curr->next;
} else {
prev->next = curr->next;
}
return EXIT_SUCCESS;
}
prev = curr;
curr = curr->next;
i++;
}
return EXIT_FAILURE;
}
// swap the item at position pos1 with the item at position pos2
int list_swap_item_positions(node **head, int pos1, int pos2) {
node *prev1 = NULL;
node *curr1 = *head;
int i = 1;
while(curr1!= NULL) {
if(i == pos1) {
break;
}
prev1 = curr1;
curr1 = curr1->next;
}
node *prev2 = NULL;
node *curr2 = *head;
i = 1;
while(curr2!= NULL) {
if(i == pos2) {
break;
}
prev2 = curr2;
curr2 = curr2->next;
}
if(prev1 == NULL) {
*head = curr2;
} else {
prev1->next = curr2;
}
if(prev2 == NULL) {
*head = curr1;
} else {
prev2->next = curr1;
}
if(curr1->next == curr2) {
curr1->next = curr2->next;
curr2->next = curr1;
} else if(curr2->next == curr1) {
curr2->next = curr1->next;
curr1->next = curr2;
}
return EXIT_SUCCESS;
}
// find the item position with the highest single price
int list_find_highest_price_item_position(node *head, int *pos)
{
if(head == NULL) {
return EXIT_FAILURE;
}
int highestPrice = 0;
int highestPricePos = 0;
unsigned int i = 1;
while(head!= NULL) {
if(head->price > highestPrice) {
highestPrice = head->price;
highestPricePos = i;
}
head = head->next;
i++;
}
*pos = highestPricePos;
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total)
{
if(head == NULL) {
return EXIT_FAILURE;
}
*total = 0;
while(head!= NULL) {
*total += (head->quantity * head->price);
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)
{
FILE *f = fopen(filename, "w");
if(f == NULL) {
return EXIT_FAILURE;
}
while(head!= NULL) {
fprintf(f, "%s,%.2f,%d\n", head->item_name, head->price, head->quantity);
head = head->next;
}
}
// 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)
{
FILE *f = fopen(filename, "r");
if(f == NULL) {
return EXIT_FAILURE;
}
}
// 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)
{
return EXIT_SUCCESS;
}