Data Structure 6

Mini Market Code

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

struct linkedList{
   
    char productName[100];
    int quantity;
   
    struct linkedList *next;
    struct linkedList *prev;
   
};



typedef struct linkedList node;



node* head;
node* tail;
node* current;
node* temp;



void createProduct(char productName[], int quantity)
{
    temp = (struct linkedList*)malloc(sizeof(struct linkedList));
    strcpy(temp->productName,productName);
    temp->quantity = quantity;
    temp->prev = temp->next = NULL;
   
    if(head==NULL)
    {
        head = tail = temp;
    }
    else
    {
        tail->next = temp;
        temp->prev = tail;
        tail = temp;
    }
}



void popHead()
{
    if(head != NULL)
    {
        if(head == tail)
        {
            free(head);
            head = tail = NULL;
        }
        else
        {
            head = head->next;
            free(head->prev);
            head->prev = NULL;
        }
    }
}



void printGroceries()
{
    struct linkedList* current = head;
    int i=1;
   
    if(head==NULL){
        printf("Wish list is empty...\n");
    }
    else{
    while(current != NULL)
    {
        printf("%d. %s (%d pcs)\n", i, current->productName, current->quantity);
        current = current -> next;
        i++;
    }
    }
    puts("");
}



void deleteProduct(char productName[101])
{
     linkedList* current = head;
    int flag = 0;
   
    if(head==NULL){
        printf("Groceries is empty...\n");
        return;
    }
    else if(head==tail && strcmp(head->productName,productName)==0){
        free(head);
        head=tail=NULL;
       
    }
    else if(strcmp(head->productName,productName)==0){
        current=head;
        head=head->next;
        free(current);
   
    }
    else if(strcmp(tail->productName,productName)==0){
        current=tail;
        tail=tail->prev;
        free(current);
        tail->next=NULL;
       
    }
    else{
        current = head;
        while(current)
        {
            if(strcmp(current->productName,productName)==0)
            {
                struct linkedList* temp = current->next;
                temp->prev = current->prev;
                current->prev->next = temp;
                free(current);
                break;
            }
            current = current->next;
        }
        printf("Product not found...\n");
    }
    }
   


void editQuantity(char productName[], int newQuantity)
{
    node* myNode = head;
   
    while(myNode != '\0')
    {
        if(strcpy(myNode -> productName, productName) == myNode -> productName)
        {
            myNode -> quantity = newQuantity;
            printf("Product quantity is updated to %d\n", newQuantity);
            break;
        }
        else
        {
            while(myNode != '\0')
            {
                myNode = myNode -> next;
                if(strcpy(myNode -> productName, productName) == myNode -> productName)   
                myNode -> quantity = newQuantity;
                printf("Product quantity is updated to %d\n", newQuantity);
                break;
            }
        }
            printf("Product name is no where to be found!\n");
    }
}



void popAll(){
     while(head != NULL)
     popHead();
}



int main(void)
{

int key, value, quantity, newQuantity, choice, input;
char productName[100];

do{
    printf("Menu:\n");
    printf("1. Add Product\n");
    printf("2. View Groceries\n");
    printf("3. Delete Product\n");
    printf("4. Edit Quantity\n");
    printf("5. Exit\n");
    printf("Please choose: ");
    scanf("%d",&choice);
   
    if(choice == 1){
        printf("\n");
        printf("Insert product name: "); getchar();
        scanf("%[^\n]", productName);
        printf("Insert quantity: ");
        scanf("%d", &quantity);
        createProduct(productName,quantity);
        printf("\n");
    }
    else if(choice == 2){
        printf("\n");
        printGroceries();
        printf("\n");
    }
    else if(choice == 3){
        printf("\n");
        printf("Insert product name: "); getchar();
        scanf("%[^\n]",productName);
        deleteProduct(productName);
        printf("\n");
    }
    else if(choice == 4)
    {
        printf("\n");
        printf("Insert product name: ");
        getchar();
        scanf("%[^\n]", productName);
        printf("Insert quantity: ");
        scanf("%d", &newQuantity);
        editQuantity(productName, newQuantity);
        printf("\n");
    }
}

while(choice != 5);
popAll();

}