Practical 3. Program based on linked list: Maintain a record of coffee shop database implement following: i. Display the total sale of a day ii. Maximum and minimum bill of a day

#include <stdio.h>

#include <stdlib.h>

// Define a node structure

struct Node {

    int data; // Store the bill amount

    struct Node* next; // Pointer to the next node

};

// Function to create a new node

struct Node* createNode(int data) {

    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));

    newNode->data = data;

    newNode->next = NULL;

    return newNode;

}

// Function to append a node to the linked list

void append(struct Node** head, int data) {

    struct Node* newNode = createNode(data);

    if (*head == NULL) {

        *head = newNode;

    } else {

        struct Node* current = *head;

        while (current->next != NULL) {

            current = current->next;

        }

        current->next = newNode;

    }

}

// Function to calculate the total sales of the day

int calculateTotalSales(struct Node* head) {

    int total = 0;

    struct Node* current = head;

    while (current != NULL) {

        total += current->data;

        current = current->next;

    }

    return total;

}

// Function to find the maximum and minimum bill of the day

void findMaxMinBill(struct Node* head, int* maxBill, int* minBill) {

    if (head == NULL) {

        *maxBill = *minBill = 0;

        return;

    }

    *maxBill = head->data;

    *minBill = head->data;

    struct Node* current = head->next;

    while (current != NULL) {

        if (current->data > *maxBill) {

            *maxBill = current->data;

        }

        if (current->data < *minBill) {

            *minBill = current->data;

        }

        current = current->next;

    }

}

int main() {

    struct Node* sales = NULL;

    int choice, amount;

    int maxBill, minBill;

    do {

        printf("\nMenu:\n");

        printf("1. Add a transaction\n");

        printf("2. Calculate total sales\n");

        printf("3. Find maximum and minimum bill\n");

        printf("4. Exit\n");

        printf("Enter your choice: ");

        scanf("%d", &choice);

        switch (choice) {

            case 1:

                printf("Enter the bill amount: ");

                scanf("%d", &amount);

                append(&sales, amount);

                printf("Transaction added.\n");

                break;

            case 2:

                printf("Total sales of the day: %d\n", calculateTotalSales(sales));

                break;

            case 3:

                findMaxMinBill(sales, &maxBill, &minBill);

                if (maxBill == 0 && minBill == 0) {

                    printf("No transactions recorded yet.\n");

                } else {

                    printf("Maximum bill of the day: %d\n", maxBill);

                    printf("Minimum bill of the day: %d\n", minBill);

                }

                break;

            case 4:

                printf("Exiting program.\n");

                break;

            default:

                printf("Invalid choice. Please try again.\n");

                break;

        }

    } while (choice != 4);

    return 0;

}