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100%Mean logprob: -0.35706671516805255 (69.97%)
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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 item_name[MAX_ITEM_PRINT_LEN];
char price[MAX_ITEM_PRINT_LEN];
char quantity[MAX_ITEM_PRINT_LEN];
char *ret_str;
int num_char;
if (head == NULL) return EXIT_FAILURE;
// extract the item name
ret_str = strstr(head->item_name, " ");
if (ret_str == NULL) return EXIT_FAILURE;
num_char = ret_str - head->item_name;
if (num_char >= MAX_ITEM_PRINT_LEN) return EXIT_FAILURE;
strncpy(item_name, head->item_name, num_char);
item_name[num_char] = '\0';
// extract the price
sprintf(price, "%.2f", head->price);
// extract the quantity
sprintf(quantity, "%d", head->quantity);
sprintf(str, "%s %s @ $%s ea", quantity, item_name, 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 *curr = head;
int i = 0;
char item_str[MAX_ITEM_PRINT_LEN];
while (curr!= NULL) {
i++;
list_item_to_string(curr, item_str);
printf("%d: %s\n", i, item_str);
curr = curr->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 *curr, *new_node;
int i;
// check for invalid inputs
if (head == NULL || item_name == NULL || quantity <= 0) return EXIT_FAILURE;
// check if the list is empty
if (*head == NULL) {
*head = malloc(sizeof(node));
(*head)->item_name = item_name;
(*head)->price = price;
(*head)->quantity = quantity;
(*head)->next = NULL;
return EXIT_SUCCESS;
}
// check if the position is past the size of the list
if (pos == 0) {
new_node = malloc(sizeof(node));
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
new_node->next = *head;
*head = new_node;
return EXIT_SUCCESS;
}
curr = *head;
for (i = 1; i < pos; i++) {
if (curr->next == NULL) return EXIT_FAILURE;
curr = curr->next;
}
new_node = malloc(sizeof(node));
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
new_node->next = curr->next;
curr->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 *curr;
int i;
// check for invalid inputs
if (head == NULL || item_name == NULL || quantity <= 0) return EXIT_FAILURE;
// check if the list is empty
if (*head == NULL) return EXIT_FAILURE;
curr = *head;
for (i = 1; i < pos; i++) {
if (curr->next == 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) {
node *curr, *prev;
int i;
// check for invalid inputs
if (head == NULL) return EXIT_FAILURE;
// check if the list is empty
if (*head == NULL) return EXIT_FAILURE;
// check if the position is past the size of the list
if (pos == 0) {
curr = *head;
*head = curr->next;
free(curr);
return EXIT_SUCCESS;
}
curr = *head;
for (i = 1; i < pos; i++) {
if (curr->next == 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) {
node *curr1, *curr2, *prev1, *prev2;
int i;
// check for invalid inputs
if (head == NULL) return EXIT_FAILURE;
// check if the list is empty
if (*head == NULL) return EXIT_FAILURE;
// check if the position is past the size of the list
if (pos1 == 0 || pos2 == 0) return EXIT_FAILURE;
if (pos1 == pos2) return EXIT_SUCCESS;
curr1 = *head;
for (i = 1; i < pos1; i++) {
if (curr1->next == NULL) return EXIT_FAILURE;
prev1 = curr1;
curr1 = curr1->next;
}
curr2 = *head;
for (i = 1; i < pos2; i++) {
if (curr2->next == NULL) return EXIT_FAILURE;
prev2 = curr2;
curr2 = curr2->next;
}
prev1->next = curr2;
prev2->next = curr1;
curr1->next = curr2->next;
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) {
node *curr;
int i, highest_price_pos = 0;
float highest_price = 0;
// check for invalid inputs
if (head == NULL || pos == NULL) return EXIT_FAILURE;
// check if the list is empty
if (head == NULL) return EXIT_FAILURE;
curr = head;
for (i = 0; curr!= NULL; curr = curr->next, i++) {
if (curr->price > highest_price) {
highest_price = curr->price;
highest_price_pos = i;
}
}
*pos = highest_price_pos;
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total) {
node *curr;
int i;
float sum = 0;
// check for invalid inputs
if (head == NULL || total == NULL) return EXIT_FAILURE;
// check if the list is empty
if (head == NULL) return EXIT_FAILURE;
curr = head;
for (i = 0; curr!= NULL; curr = curr->next, i++) {
sum += curr->price*curr->quantity;
}
*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) {
node *curr;
FILE *fp;
int i;
// check for invalid inputs
if (head == NULL || filename == NULL) return EXIT_FAILURE;
// check if the list is empty
if (head == NULL) return EXIT_FAILURE;
// open the file for writing
fp = fopen(filename, "w");
if (fp == NULL) return EXIT_FAILURE;
curr = head;
for (i = 0; curr!= NULL; curr = curr->next, i++) {
fprintf(fp, "%s,%.2f,%d\n", curr->item_name, curr->price, curr->quantity);
}
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) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
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) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
return EXIT_FAILURE;
}