Hey guys just wondering how i can sort the linked list by categoryName
for the drink type list. Iv done the linked list in my code but its not sorted?
Could someone help me write an algorithm or sum pseudocode
#ifndef GJC_H
#define GJC_H
/* System-wide header files. */
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
/* System-wide constants. */
#define ID_LEN 5
#define MIN_NAME_LEN 1
#define MAX_NAME_LEN 25
#define MIN_DESC_LEN 1
#define MAX_DESC_LEN 250
#define NUM_PRICES 3
#define HOT 'H'
#define COLD 'C'
#define ERRORCODE 1
#define BUFFER_SIZE 800
#define NC_ARRAY_SIZE 500
#define TRUE 1
#define FALSE 0
#define CHAR -----------------------------------------------------------------------
typedef struct category* CategoryTypePtr;
typedef struct item* ItemTypePtr;
/* Structure definitions. */
typedef struct price
{
unsigned dollars;
unsigned cents;
} PriceType;
typedef struct item
{
char itemID[ID_LEN + 1];
char itemName[MAX_NAME_LEN + 1];
PriceType prices[NUM_PRICES];
char itemDescription[MAX_DESC_LEN];
ItemTypePtr nextItem;
} ItemType;
typedef struct category
{
char categoryID[ID_LEN + 1];
char categoryName[MAX_NAME_LEN + 1];
char drinkType; /* (H)ot or (C)old. */
char categoryDescription[MAX_DESC_LEN];
CategoryTypePtr nextCategory;
ItemTypePtr headItem;
unsigned numItems;
} drinkType;
typedef struct gjc
{
CategoryTypePtr headCategory;
unsigned numCategories;
} GJCType;
int commandLineArguments(int argc, char *argv[]);
#endif
Code:
int loadData(GJCType* menu, char* menuFile, char* submenuFile)
{
drinkType *currentCat, *prevCat, *newCat;
ItemType *currentItem, *prevItem, *newItem;
FILE *fp1;
FILE *fp2;
char *token, *line;
char array[BUFFER_SIZE + 2];
double d;
unsigned doll;
int i;
char nc_array[NC_ARRAY_SIZE + 1];
/* Open menu file for reading. */
fp1 = fopen(menuFile, "r");
/* check if fp1 menu file exists*/
if(fp1 == NULL)
{
printf("file %s does not exist \n", menuFile);
exit(0);
}
/* initialize the previous node to NULL*/
prevCat = NULL;
while((line = fgets(array, BUFFER_SIZE + 2, fp1)) != NULL)
{
/* allocate memory for CategoryType pointer*/
newCat = malloc(sizeof(drinkType));
/* check if memory allocation succeeded if fails exit*/
if(newCat == NULL)
{
printf("Memory Allocation error for newCat\n");
exit(0);
}
/* if the prevCat is NULL point the new node to the
start of the list*/
if(prevCat == NULL)
{
menu->headCategory = newCat;
}
/* if it isnt at the start get the next -1node*/
else
{
prevCat->nextCategory = newCat;
}
/* tokenize the Pipe and copy the field
pointers into the struct*/
token = strtok(line, "|");
strcpy(newCat->categoryID, token);
token = strtok(NULL, "|");
newCat->drinkType = token[0];
token = strtok(NULL, "|");
strcpy(newCat->categoryName, token);
token = strtok(NULL, "|");
strcpy(newCat->categoryDescription, token);
/* initialize everything to a safe state*/
newCat->nextCategory = NULL;
newCat->headItem = NULL;
newCat->numItems = 0;
prevCat = newCat;
}
/* the current pointer points to headCategory*/
currentCat = menu->headCategory;
/* for testing purposes traverse through the list
and print out linked list*/
/*
while(currentCat != NULL)
{
printf("\n%s, %c, %s, %s", currentCat->categoryID,
currentCat->drinkType,
currentCat->categoryName,
currentCat->categoryDescription);
*/
/* get the next row
currentCat = currentCat->nextCategory;
}*/
/* close the first pointer to the file*/
/* check if it can close it otherwise error*/
if(fclose(fp1)!=0)
{
fprintf(stderr, "cannot close file\n");
}
/* Open submenu file for reading. */
fp2 = fopen(submenuFile, "r");
/* check if sub menu file exists*/
if(fp2 == NULL)
{
printf("file %s does not exist \n", submenuFile);
exit(0);
}
/*intialize pointer to the start*/
prevItem = NULL;
currentCat = menu->headCategory;
while((line = fgets(array, BUFFER_SIZE + 2, fp2)) != NULL)
{
newItem = malloc(sizeof(ItemType));
token = strtok(line, "|");
strcpy(newItem->itemID, token);
token = strtok(NULL, "|");
strcpy(nc_array, token);
/* put the current pointer to the head of the list*/
currentCat = menu->headCategory;
/* while current is pointing to a node*/
while(currentCat != NULL)
{
if(strcmp(currentCat->categoryID, nc_array) == 0)
{
break;
}
currentCat = currentCat->nextCategory;
}
if(currentCat == NULL)
{
printf("NULL POINTER Error!!!\n");
}
else
{
token = strtok(NULL, "|");
strcpy(newItem->itemName, token);
/* store dollars into struct array*/
/* convert all prices to float when storing*/
for(i = 0; i < NUM_PRICES; i++)
{
token = strtok(NULL, "|");
d = atof(token);
doll = (unsigned) d;
newItem->prices[i].dollars = doll;
newItem->prices[i].cents = (d - doll) * 100;
}
token = strtok(NULL, "|");
strcpy(newItem->itemDescription, token);
/* from the start of the list*/
newItem->nextItem = currentCat->headItem;
currentCat->headItem = newItem;
/* increment the counter*/
currentCat->numItems ++;
}
}
currentCat = menu->headCategory;
/*
while(currentCat!= NULL)
{
currentItem = currentCat->headItem;
printf("Items for category %s\n", currentCat->categoryID);
while(currentItem != NULL)
{
printf("\n%s, %s, %s, %d.%d, %d.%d, %d.%d, %s\n",
currentItem->itemID, currentCat->categoryID,
currentItem->itemName, currentItem->prices[0].dollars,currentItem->prices[0].cents,
currentItem->prices[1].dollars, currentItem->prices[1].cents,
currentItem->prices[2].dollars, currentItem->prices[2].cents,
currentItem->itemDescription);
currentItem = currentItem->nextItem;
}
currentCat = currentCat->nextCategory;
}*/
/* try to close the file*/
/* if it wont close provide an error*/
if(fclose(fp2)!=0)
{
fprintf(stderr, "cannot close file\n");
}
return EXIT_SUCCESS;
}