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100%Mean logprob: -0.3348989363202317 (71.54%)
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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 return a status code EXIT_FAILURE or EXIT_SUCCESS
// to indicate whether the operation was successful or not.
// Members of the node struct:
// char* item_name, float price, int quantity, node *next
// 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) {
char *str_ptr = str;
char *format_str = "%d * %s @ $%.2f ea\n";
if (head == NULL) {
return EXIT_FAILURE;
}
int written_chars = sprintf(str_ptr, format_str, head->quantity, head->item_name, head->price);
if (written_chars < 0) {
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) {
int pos = 1;
node *current_node = head;
char print_str[MAX_ITEM_PRINT_LEN];
while (current_node!= NULL) {
list_item_to_string(current_node, print_str);
printf("%d: %s", pos, print_str);
pos++;
current_node = current_node->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) {
node *new_node = malloc(sizeof(node));
node *current_node = *head;
new_node->price = price;
new_node->quantity = quantity;
new_node->item_name = malloc(sizeof(char) * (strlen(item_name) + 1));
strcpy(new_node->item_name, item_name);
new_node->next = NULL;
if (pos == 1) {
new_node->next = *head;
*head = new_node;
return EXIT_SUCCESS;
}
for (int i = 1; i < pos - 1; i++) {
if (current_node == NULL) {
return EXIT_FAILURE;
}
current_node = current_node->next;
}
new_node->next = current_node->next;
current_node->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) {
node *current_node = *head;
if (pos < 1) {
return EXIT_FAILURE;
}
for (int i = 1; i < pos; i++) {
if (current_node == NULL) {
return EXIT_FAILURE;
}
current_node = current_node->next;
}
current_node->price = price;
current_node->quantity = quantity;
free(current_node->item_name);
current_node->item_name = malloc(sizeof(char) * (strlen(item_name) + 1));
strcpy(current_node->item_name, item_name);
return EXIT_SUCCESS;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos) {
node *current_node = *head;
if (pos < 1) {
return EXIT_FAILURE;
}
if (pos == 1) {
*head = current_node->next;
free(current_node->item_name);
free(current_node);
return EXIT_SUCCESS;
}
for (int i = 1; i < pos - 1; i++) {
if (current_node == NULL) {
return EXIT_FAILURE;
}
current_node = current_node->next;
}
node *node_to_remove = current_node->next;
current_node->next = current_node->next->next;
free(node_to_remove->item_name);
free(node_to_remove);
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) {
node *current_node = *head;
node *node1 = NULL;
node *node2 = NULL;
node *previous_node1 = NULL;
node *previous_node2 = NULL;
if (pos1 < 1 || pos2 < 1) {
return EXIT_FAILURE;
}
for (int i = 1; i < pos1; i++) {
if (current_node == NULL) {
return EXIT_FAILURE;
}
previous_node1 = current_node;
current_node = current_node->next;
}
node1 = current_node;
current_node = *head;
for (int i = 1; i < pos2; i++) {
if (current_node == NULL) {
return EXIT_FAILURE;
}
previous_node2 = current_node;
current_node = current_node->next;
}
node2 = current_node;
if (pos1 == 1) {
previous_node2->next = node1;
node1->next = node2->next;
node2->next = node1;
*head = node2;
} else if (pos2 == 1) {
previous_node1->next = node2;
node2->next = node1->next;
node1->next = node2;
*head = node1;
} else {
previous_node1->next = node2;
previous_node2->next = node1;
node1->next = node2->next;
node2->next = node1->next;
}
return EXIT_SUCCESS;
}
// find the item position with the highest single price
int list_find_highest_price_item_position(node *head, int *pos) {
int highest_price = -1;
node *current_node = head;
for (int i = 1; current_node!= NULL; i++) {
if (current_node->price > highest_price) {
highest_price = current_node->price;
*pos = i;
}
current_node = current_node->next;
}
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total) {
node *current_node = head;
*total = 0;
for (int i = 1; current_node!= NULL; i++) {
*total += current_node->price * current_node->quantity;
current_node = current_node->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 *file = fopen(filename, "wb");
node *current_node = head;
if (file == NULL) {
return EXIT_FAILURE;
}
while (current_node!= NULL) {
fprintf(file, "%s,%f,%d\n", current_node->item_name, current_node->price, current_node->quantity);
current_node = current_node->next;
}
fclose(file);
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) {
FILE *file = fopen(filename, "rb");
if (file == NULL) {
return EXIT_FAILURE;
}
node *current_node = *head;
if (current_node == NULL) {
return EXIT_FAILURE;
}
while (current_node->next!= NULL) {
current_node = current_node->next;
}
while (1) {
char item_name[100];
float price;
int quantity;
int num_scanned = fscanf(file, "%[^,],%f,%d\n", item_name, &price, &quantity);
if (num_scanned == EOF) {
break;
}
if (num_scanned!= 3) {
return EXIT_FAILURE;
}
node *new_node = malloc(sizeof(node));
new_node->item_name = malloc(sizeof(char) * (strlen(item_name) + 1));
strcpy(new_node->item_name, item_name);
new_node->price = price;
new_node->quantity = quantity;
new_node->next = NULL;
current_node->next = new_node;
current_node = current_node->next;
}
fclose(file);
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) {
node *current_node = *head;
while (current_node!= NULL) {
node *node_to_check = current_node->next;
while (node_to_check!= NULL) {
if (strcmp(current_node->item_name, node_to_check->item_name) == 0) {
current_node->quantity += node_to_check->quantity;
node *node_to_remove = node_to_check;
node_to_check = node_to_check->next;
list_remove_item_at_pos(head, node_to_remove->quantity);
} else {
node_to_check = node_to_check->next;
}
}
current_node = current_node->next;
}
return EXIT_SUCCESS;
}