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100%Mean logprob: -0.34685964555098653 (70.69%)
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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) {
node *new_node = malloc(sizeof(node));
if (new_node == NULL) {
return EXIT_FAILURE;
}
*head = new_node;
new_node->next = 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;
}
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) {
node *cur_node = head;
int i = 1;
while (cur_node!= NULL) {
char str[MAX_ITEM_PRINT_LEN];
if (list_item_to_string(cur_node, str) == EXIT_FAILURE) {
return EXIT_FAILURE;
}
printf("%d: %s\n", i, str);
cur_node = cur_node->next;
i++;
}
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));
if (new_node == NULL) {
return EXIT_FAILURE;
}
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
if (pos == 1) {
new_node->next = *head;
*head = new_node;
return EXIT_SUCCESS;
}
node *prev_node = *head;
node *cur_node = (*head)->next;
unsigned int i = 2;
while (cur_node!= NULL) {
if (i == pos) {
new_node->next = cur_node;
prev_node->next = new_node;
return EXIT_SUCCESS;
}
prev_node = cur_node;
cur_node = cur_node->next;
i++;
}
if (i == pos) {
prev_node->next = new_node;
new_node->next = NULL;
return EXIT_SUCCESS;
}
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) {
if (pos == 1) {
(*head)->item_name = item_name;
(*head)->price = price;
(*head)->quantity = quantity;
return EXIT_SUCCESS;
}
node *cur_node = (*head)->next;
unsigned int i = 2;
while (cur_node!= NULL) {
if (i == pos) {
cur_node->item_name = item_name;
cur_node->price = price;
cur_node->quantity = quantity;
return EXIT_SUCCESS;
}
cur_node = cur_node->next;
i++;
}
return EXIT_FAILURE;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos) {
if (pos == 1) {
node *cur_node = *head;
*head = (*head)->next;
free(cur_node);
return EXIT_SUCCESS;
}
node *prev_node = *head;
node *cur_node = (*head)->next;
unsigned int i = 2;
while (cur_node!= NULL) {
if (i == pos) {
prev_node->next = cur_node->next;
free(cur_node);
return EXIT_SUCCESS;
}
prev_node = cur_node;
cur_node = cur_node->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 *node1 = *head;
node *node2 = *head;
unsigned int i = 1;
while (node1!= NULL) {
if (i == pos1) {
break;
}
node1 = node1->next;
i++;
}
i = 1;
while (node2!= NULL) {
if (i == pos2) {
break;
}
node2 = node2->next;
i++;
}
if (node1 == NULL || node2 == NULL) {
return EXIT_FAILURE;
}
char *temp_item_name = node1->item_name;
float temp_price = node1->price;
int temp_quantity = node1->quantity;
node1->item_name = node2->item_name;
node1->price = node2->price;
node1->quantity = node2->quantity;
node2->item_name = temp_item_name;
node2->price = temp_price;
node2->quantity = temp_quantity;
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;
}
node *cur_node = head;
unsigned int i = 1;
unsigned int max_pos = 1;
float max_price = cur_node->price;
while (cur_node!= NULL) {
if (cur_node->price > max_price) {
max_price = cur_node->price;
max_pos = i;
}
cur_node = cur_node->next;
i++;
}
*pos = max_pos;
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;
}
node *cur_node = head;
float sum = 0;
while (cur_node!= NULL) {
sum += cur_node->price * cur_node->quantity;
cur_node = cur_node->next;
}
*total = sum;
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 *fp = fopen(filename, "w");
if (fp == NULL) {
return EXIT_FAILURE;
}
node *cur_node = head;
while (cur_node!= NULL) {
fprintf(fp, "%s,%.2f,%d\n", cur_node->item_name, cur_node->price, cur_node->quantity);
cur_node = cur_node->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) {
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
return EXIT_FAILURE;
}
node *cur_node = *head;
while (cur_node->next!= NULL) {
cur_node = cur_node->next;
}
char *item_name = NULL;
float price;
int quantity;
while (fscanf(fp, "%m[^,],%f,%d\n", &item_name, &price, &quantity)!= EOF) {
cur_node->next = malloc(sizeof(node));
cur_node->next->item_name = item_name;
cur_node->next->price = price;
cur_node->next->quantity = quantity;
cur_node->next->next = NULL;
cur_node = cur_node->next;
}
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) {
node *cur_node = *head;
while (cur_node!= NULL) {
node *cur_node2 = cur_node->next;
node *prev_node2 = cur_node;
while (cur_node2!= NULL) {
if (strcmp(cur_node->item_name, cur_node2->item_name) == 0) {
cur_node->quantity += cur_node2->quantity;
prev_node2->next = cur_node2->next;
free(cur_node2);
cur_node2 = prev_node2;
}
prev_node2 = cur_node2;
cur_node2 = cur_node2->next;
}
cur_node = cur_node->next;
}
return EXIT_SUCCESS;
}