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100%Mean logprob: -0.5627921899785425 (56.96%)
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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) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// cannot print NULL node
if (head == NULL) {
return EXIT_FAILURE;
}
// store formatted string in str
int len = sprintf(str, "%d * %s @ $%.2f ea", head->quantity, head->item_name, head->price);
if (len < 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) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
node* ptr = head;
char str[100];
int counter = 1;
// loop until end of list and print each item
while (ptr!= NULL) {
int status = list_item_to_string(ptr, str);
if (status == EXIT_FAILURE) { // check for error
return EXIT_FAILURE;
}
printf("%d: %s\n", counter, str);
ptr = ptr->next;
counter++;
}
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)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// pos must be an integer >= 1
if (pos < 1) {
return EXIT_FAILURE;
}
node* prev_ptr = NULL;
node* next_ptr = *head; // node that will be pushed down 1 index (curr node at pos)
int counter = 1;
while(counter < pos && next_ptr!= NULL) {
prev_ptr = next_ptr;
next_ptr = next_ptr->next;
counter++;
}
// counter should be equal to pos by end of while loop
// otherwise this means we've looped until end of list and
// pos exceeds list length
if (counter!= pos) {
return EXIT_FAILURE;
}
// make new node
node* new_item_ptr = malloc(sizeof(node));
new_item_ptr->item_name = malloc(strlen(item_name) + 1);
strcpy(new_item_ptr->item_name, item_name);
new_item_ptr->price = price;
new_item_ptr->quantity = quantity;
new_item_ptr->next = next_ptr;
// case: pos is not 1, hence prev_str!= NULL
if (pos!= 1) {
prev_ptr->next = new_item_ptr;
} else {
*head = new_item_ptr; // update head ptr if pos == 1
}
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) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// pos must be an integer >= 1
if (pos < 1) {
return EXIT_FAILURE;
}
int counter = 1;
node* ptr = *head;
// loop until ptr points to item or ptr reaches end of list
while(ptr!= NULL && counter < pos) {
ptr = ptr->next;
counter++;
}
// end of list, ptr is NULL, cannot modify non-existing item
if (ptr == NULL) {
return EXIT_FAILURE;
}
// update existing item
free(ptr->item_name);
ptr->item_name = malloc(strlen(item_name) + 1);
strcpy(ptr->item_name, item_name);
ptr->price = price;
ptr->quantity = quantity;
return EXIT_SUCCESS;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// pos must be an integer >= 1
if (pos < 1) {
return EXIT_FAILURE;
}
node* prev_ptr = NULL; // node before node to be removed
node* rem_ptr = *head; // node that will be removed (curr node at pos)
int counter = 1;
// loop until rem_ptr points to the node to be removed or reaches end of list
while(counter < pos && rem_ptr!= NULL) {
prev_ptr = rem_ptr;
rem_ptr = rem_ptr->next;
counter++;
}
// cannot remove end of list/NULL
if (rem_ptr == NULL) {
return EXIT_FAILURE;
}
// case: pos is not 1, hence prev_str!= NULL
if (pos!= 1) {
prev_ptr->next = rem_ptr->next;
} else {
*head = rem_ptr->next; // note that rem_ptr = *head in this case
}
// free memory
free(rem_ptr->item_name);
free(rem_ptr);
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) {
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// positions must be an integer >= 1
if (pos1 < 1 || pos2 < 1) {
return EXIT_FAILURE;
}
if (pos1 == pos2) {
return EXIT_SUCCESS;
}
node* ptr1 = *head;
node* ptr2 = *head;
int counter = 1;
// loop until both ptrs are set or reach end of list
while(ptr1!= NULL && ptr2!= NULL && (counter < pos1 || counter < pos2)) {
if (counter < pos1) {
ptr1 = ptr1->next;
}
if (counter < pos2) {
ptr2 = ptr2->next;
}
counter++;
}
// cannot swap with end of list (NULL)
if (ptr1 == NULL || ptr2 == NULL) {
return EXIT_FAILURE;
}
// swap attr
char* temp_name = ptr1->item_name;
float temp_price = ptr1->price;
int temp_quantity = ptr1->quantity;
ptr1->item_name = ptr2->item_name;
ptr1->price = ptr2->price;
ptr1->quantity = ptr2->quantity;
ptr2->item_name = temp_name;
ptr2->price = temp_price;
ptr2->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)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// set pos of node item with highest price to 0 if list empty
if (head == NULL) {
*pos = 0;
return EXIT_SUCCESS;
}
node* ptr = head;
int highest_price = 0;
int counter = 1;
// loop through list
while(ptr!= NULL) {
// new high price found
if (ptr->price > highest_price) {
highest_price = ptr->price;
*pos = counter;
}
ptr = ptr->next;
counter++;
}
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
node* ptr = head;
float total_cost = 0;
// loop through list and sum total cost
while(ptr!= NULL) {
total_cost += (ptr->price * ptr->quantity);
ptr = ptr->next;
}
// set total cost
*total = total_cost;
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)
{
// TODO: Implement this function,
// return EXIT_SUCCESS or EXIT_FAILURE when appropriate
// open file and check for error
FILE* fileptr = fopen(filename, "w");
if (fileptr == NULL) {
return EXIT_FAILURE;
}
node* ptr = head;
char str[100];
// loop through list and write each item in specified format
while(ptr!= NULL) {
fprintf(fileptr, "%s,%.2f,%d\n", ptr->item_name, ptr->price, ptr->quantity);
ptr = ptr->next;
}
// close file
fclose(fileptr);
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
// open file and check for error
FILE* fileptr = fopen(filename, "r");
if (fileptr == NULL) {
return EXIT_FAILURE;
}
node* ptr = *head;
int counter = 1;
// loop through list and until it reaches end to set counter
while(ptr!= NULL) {
counter++;
ptr = ptr->next;
}
char name[100];
float price;
int quantity;
// scan through file and set the attributes (note %*c to ignore, delimiter)
while(fscanf(fileptr, "%[^,],%f%*c%d\n", name, &price, &quantity)!= EOF) {
// add item to end of list
int status = list_add_item_at_pos(head, name, price, quantity, counter);
if (status == EXIT_FAILURE) { // check item added correctly
return EXIT_FAILURE;
}
counter++;
}
// close file
fclose(fileptr);
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
node* ptr = *head;
int ptr_counter = 1;
// loops through each item in list
while (ptr!= NULL) {
node* dup_ptr = ptr->next; // checks for duplicates
int dup_counter = ptr_counter + 1;
// loops through rest of list starting with the node after ptr
while(dup_ptr!= NULL) {
// update quantity if the two pointers have same item name
if(strcmp(ptr->item_name, dup_ptr->item_name) == 0) {
node* rem_ptr = dup_ptr;
ptr->quantity += rem_ptr->quantity; // update quantity
dup_ptr = dup_ptr->next; // move dup_ptr to next pointer
// remove duplicate and check for error
int status = list_remove_item_at_pos(head, dup_counter);
if (status == EXIT_FAILURE) {
return EXIT_FAILURE;
}
continue;
}
dup_ptr = dup_ptr->next;
dup_counter++;
}
ptr = ptr->next;
ptr_counter++;
}
return EXIT_SUCCESS;
}