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100%Mean logprob: -0.44831747527979243 (63.87%)
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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) {
node *current = head;
int i=0, j=0;
char *p = str;
while (current!=NULL) {
int len=0;
float f = current->price;
char *item_name = current->item_name;
len = sprintf(p, "%d * %s @ $%.2f ea", current->quantity, item_name, f);
p += len;
i++;
current = current->next;
j++;
}
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 *current = head;
int i=0;
while (current!= NULL) {
printf("%d: %d * %s @ $%.2f ea\n", i, current->quantity, current->item_name, current->price);
current = current->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 *current = *head;
node *new_node = malloc(sizeof(node));
new_node->item_name = item_name;
new_node->price = price;
new_node->quantity = quantity;
new_node->next = NULL;
int i=0;
if (pos==0) {
new_node->next = *head;
*head = new_node;
return EXIT_SUCCESS;
}
while (current!= NULL && i<pos) {
if (i+1==pos) {
new_node->next = current->next;
current->next = new_node;
return EXIT_SUCCESS;
}
current = current->next;
i++;
}
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) {
node *current = *head;
int i=0;
while (current!= NULL && i<pos) {
if (i+1==pos) {
current->item_name = item_name;
current->price = price;
current->quantity = quantity;
return EXIT_SUCCESS;
}
current = current->next;
i++;
}
return EXIT_FAILURE;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos) {
node *current = *head;
node *prev = NULL;
int i=0;
while (current!= NULL) {
if (i+1==pos) {
if (prev==NULL) {
*head = current->next;
free(current);
return EXIT_SUCCESS;
}
prev->next = current->next;
free(current);
return EXIT_SUCCESS;
}
prev = current;
current = current->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 *current = *head;
node *prev = NULL;
int i=0;
while (current!= NULL) {
if (i+1==pos1) {
if (prev==NULL) {
*head = current->next;
current->next = *head;
*head = current;
return EXIT_SUCCESS;
}
prev->next = current->next;
current->next = *head;
*head = current;
return EXIT_SUCCESS;
}
if (i+1==pos2) {
if (prev==NULL) {
*head = current->next;
current->next = *head;
*head = current;
return EXIT_SUCCESS;
}
prev->next = current->next;
current->next = *head;
*head = current;
return EXIT_SUCCESS;
}
prev = current;
current = current->next;
i++;
}
return EXIT_FAILURE;
}
// find the item position with the highest single price
int list_find_highest_price_item_position(node *head, int *pos) {
node *current = head;
int i=0, j=0;
float max_price=0.0;
while (current!= NULL) {
float f = current->price;
if (f>=max_price) {
max_price = f;
j=i;
}
current = current->next;
i++;
}
*pos = j;
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 = head;
float f = 0.0;
while (current!= NULL) {
f += current->quantity*current->price;
current = current->next;
}
*total = f;
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 *current = head;
while (current!= NULL) {
fprintf(fp, "%s,%.2f,%d\n", current->item_name, current->price, current->quantity);
current = current->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;
}
char line[MAX_ITEM_PRINT_LEN+1];
while (fgets(line, MAX_ITEM_PRINT_LEN, fp)) {
int i=0;
int pos1 = 0, pos2 = 0;
char *item_name = NULL;
float price = 0.0;
int quantity = 0;
while (line[i]!=',' && line[i]!=0) {
i++;
}
if (line[i]==0) {
break;
}
item_name = line;
i++;
while (line[i]!=',' && line[i]!=0) {
i++;
}
if (line[i]==0) {
break;
}
pos1 = i+1;
float f = atof(&line[i+1]);
i=0;
while (line[i]!=0) {
i++;
}
if (line[i]==0) {
break;
}
pos2 = i;
quantity = atoi(&line[pos1]);
price = f;
list_add_item_at_pos(head, item_name, price, quantity, pos2);
}
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 *current = *head;
node *prev = NULL;
while (current!= NULL) {
if (prev!=NULL && strcmp(current->item_name, prev->item_name)==0) {
prev->quantity += current->quantity;
current = current->next;
list_remove_item_at_pos(head, prev->quantity);
//list_print(*head);
}
else {
prev = current;
current = current->next;
}
}
return EXIT_SUCCESS;
}