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100%Mean logprob: -0.3787418960608191 (68.47%)
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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) {
if (head == NULL) {
strcpy(str, "");
return EXIT_FAILURE;
}
char str_price[MAX_ITEM_PRINT_LEN];
sprintf(str_price, "%.2f", head->price);
sprintf(str, "%d * %s @ $%s ea", head->quantity, head->item_name, str_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) {
int pos = 0;
while (head!= NULL) {
char str[MAX_ITEM_PRINT_LEN];
list_item_to_string(head, str);
printf("%d: %s\n", ++pos, str);
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) {
node *new_node = malloc(sizeof(node));
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
int i;
node *curr = *head;
node *prev = NULL;
for (i = 0; i < pos; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
prev = curr;
curr = curr->next;
}
if (prev == NULL) {
new_node->next = *head;
*head = new_node;
} else {
new_node->next = curr;
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) {
int i;
node *curr = *head;
for (i = 0; i < pos; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
curr = curr->next;
}
if (curr == NULL) {
return EXIT_FAILURE;
}
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) {
int i;
node *curr = *head;
node *prev = NULL;
for (i = 0; i < pos; i++) {
if (curr == NULL) {
return EXIT_FAILURE;
}
prev = curr;
curr = curr->next;
}
if (prev == NULL) {
*head = curr->next;
} else {
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) {
int i;
node *curr1 = *head;
node *curr2 = *head;
node *prev1 = NULL;
node *prev2 = NULL;
for (i = 0; i < pos1; i++) {
if (curr1 == NULL) {
return EXIT_FAILURE;
}
prev1 = curr1;
curr1 = curr1->next;
}
for (i = 0; i < pos2; i++) {
if (curr2 == NULL) {
return EXIT_FAILURE;
}
prev2 = curr2;
curr2 = curr2->next;
}
if (curr1 == NULL || curr2 == NULL) {
return EXIT_FAILURE;
}
if (prev1 == NULL) {
*head = curr2;
} else {
prev1->next = curr2;
}
if (prev2 == NULL) {
*head = curr1;
} else {
prev2->next = curr1;
}
node *temp = curr2->next;
curr2->next = curr1->next;
curr1->next = temp;
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;
}
float highest_price = head->price;
int highest_pos = 0;
int i = 0;
while (head!= NULL) {
if (head->price > highest_price) {
highest_price = head->price;
highest_pos = i;
}
head = head->next;
i++;
}
*pos = highest_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;
}
*total = 0;
while (head!= NULL) {
*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) {
FILE *file = fopen(filename, "w");
if (file == NULL) {
return EXIT_FAILURE;
}
while (head!= NULL) {
fprintf(file, "%s,%.2f,%d\n", head->item_name, head->price, head->quantity);
head = head->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, "r");
if (file == NULL) {
return EXIT_FAILURE;
}
node *new_node = *head;
while (new_node!= NULL && new_node->next!= NULL) {
new_node = new_node->next;
}
char line[100];
while (fgets(line, 100, file)!= NULL) {
if (new_node == NULL) {
new_node = malloc(sizeof(node));
*head = new_node;
} else {
new_node->next = malloc(sizeof(node));
new_node = new_node->next;
}
char *item_name = strtok(line, ",");
new_node->item_name = malloc(strlen(item_name) + 1);
strcpy(new_node->item_name, item_name);
new_node->price = atof(strtok(NULL, ","));
new_node->quantity = atoi(strtok(NULL, "\n"));
new_node->next = NULL;
}
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 *curr = *head;
node *prev = NULL;
while (curr!= NULL) {
int found = 0;
node *inner_curr = curr->next;
node *inner_prev = curr;
while (inner_curr!= NULL) {
if (strcmp(curr->item_name, inner_curr->item_name) == 0) {
curr->quantity += inner_curr->quantity;
inner_prev->next = inner_curr->next;
free(inner_curr);
inner_curr = inner_prev->next;
found = 1;
} else {
inner_prev = inner_curr;
inner_curr = inner_curr->next;
}
}
if (found) {
if (prev == NULL) {
*head = curr->next;
free(curr);
curr = *head;
} else {
prev->next = curr->next;
free(curr);
curr = prev->next;
}
} else {
prev = curr;
curr = curr->next;
}
}
return EXIT_SUCCESS;
}