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100%Mean logprob: -0.4938582866121377 (61.03%)
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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_FAILURE;
} else {
sprintf(str, "%d * %s @ $%.2f ea", head->quantity, head->item_name, head->price);
}
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;
} else {
node *cur = head;
int pos = 1;
while (cur!= NULL) {
printf("%d: %s\n", pos, list_item_to_string(cur, cur->item_name));
cur = cur->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)
{
if (pos<1) {
return EXIT_FAILURE;
}
if (*head == NULL) {
node *new_node = malloc(sizeof(node));
if (new_node == NULL) {
return EXIT_FAILURE;
}
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
new_node->next = NULL;
*head = new_node;
return EXIT_SUCCESS;
}
node *curr = *head;
node *prev = NULL;
for (unsigned int i=1; i<pos; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
prev = curr;
curr = curr->next;
}
node *new_node = malloc(sizeof(node));
if (new_node == NULL) {
return EXIT_FAILURE;
}
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
new_node->next = curr;
if (curr == *head) {
*head = new_node;
} else {
prev->next = 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) {
if (pos<1) {
return EXIT_FAILURE;
}
if (*head == NULL) {
return EXIT_FAILURE;
}
node *curr = *head;
for (unsigned int i=1; i<pos; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
curr = curr->next;
}
curr->item_name = item_name;
curr->price = price;
curr->quantity = quantity;
return EXIT_SUCCESS;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos)
{
if (pos<1) {
return EXIT_FAILURE;
}
if (*head == NULL) {
return EXIT_FAILURE;
}
if (pos == 1) {
node *curr = *head;
*head = curr->next;
free(curr);
return EXIT_SUCCESS;
}
node *curr = *head;
node *prev = NULL;
for (unsigned int i=1; i<pos; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
prev = curr;
curr = curr->next;
}
prev->next = curr->next;
free(curr);
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) {
if (pos1 < 1 || pos2 < 1) {
return EXIT_FAILURE;
}
if (*head == NULL) {
return EXIT_FAILURE;
}
if (pos1 == pos2) {
return EXIT_SUCCESS;
}
node *curr = *head;
for (unsigned int i=1; i<pos1; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
curr = curr->next;
}
list_update_item_at_pos(head, curr->item_name, curr->price, curr->quantity, pos2);
node *curr2 = *head;
for (unsigned int i=1; i<pos2; i++) {
if (curr2 == NULL) {
return EXIT_FAILURE;
}
curr2 = curr2->next;
}
list_update_item_at_pos(head, curr2->item_name, curr2->price, curr2->quantity, pos1);
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;
} else {
node *cur = head;
int curr_pos = 1 ;
int max = -1;
while (cur!= NULL) {
if (cur->price > max) {
max = cur->price;
pos = curr_pos;
}
cur = cur->next;
curr_pos++;
}
}
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total){
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)
{
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)
{
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
return EXIT_SUCCESS;
}