banking_linkedlist.c

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

struct client {
    int id;
    int card_number;
    char *name;
    int pin;
    double money;
};

struct node {
    struct client *data;
    struct node *next;
};

struct linked_list {
    struct node *head;
    struct node *tail;
};

//User inputs
int passinput;
int cardinput;
float moneyinput;
int choiceinput;

struct client *new_client(int id, int card_number, char *name, int pin, double money) {
    struct client *c = (struct client *) malloc(sizeof(struct client));
    //c = realloc(c, sizeof(struct client*));
    c->id = id;
    c->card_number = card_number;
    c->name = strdup(name);
    c->pin = pin;
    c->money = money;

    return c;
}

struct node *new_node(struct client *data) {
    struct node *n = malloc(sizeof(struct node *));
    //n = realloc(n, sizeof(struct node*));
    n->data = data;
    n->next = NULL;

    return n;
}

struct linked_list *new_list() {
    struct linked_list *l = malloc(sizeof(struct linked_list *));
    //l = realloc(l, sizeof(struct linked_list*));
    l->head = NULL;
    l->tail = NULL;

    return l;
}

void list_add(struct linked_list *list, struct node *n) {
    if (list->head == NULL) {
        list->head = n;
    } else {
        list->tail->next = n;
    }

    list->tail = n;
}

void list_print(struct linked_list *list) {
    printf_s("\nWelcome to Letran Bank\n\n");
    printf_s("VIEW RECORDS\n");
    printf("%3s %11s %25s %20s\n", "ID", "CARD NUMBER", "NAME", "BALANCE");
    for (struct node *n = list->head; n != NULL; n = n->next) {
        printf("%3d %11d %25s %20f\n", n->data->id, n->data->card_number, n->data->name, n->data->money);
    }
}

void change_pin(struct linked_list *list, int cardnumber) {
    for (struct node *n = list->head; n != NULL; n = n->next) {
        if (n->data->card_number == cardnumber) {
            printf_s("\nWelcome to Letran Bank\n\n");
            printf_s("CHANGE PIN\n");

            printf_s("Enter current pin: ");
            scanf("%d", &passinput);
            if (n->data->pin == passinput) {
                printf_s("Enter new pin: ");
                scanf("%d", &passinput);
                n->data->pin = passinput;
            } else {
                printf("Wrong pin.");
            }
        }
    }
}

void deposit_money(struct linked_list *list, int cardnumber) {
    for (struct node *n = list->head; n != NULL; n = n->next) {
        if (n->data->card_number == cardnumber) {
            printf_s("\nWelcome to Letran Bank\n\n");
            printf_s("DEPOSIT MONEY\n");
            printf_s("Enter amount to be deposited: ");
            scanf("%f", &moneyinput);
            n->data->money += moneyinput;
            printf_s("Current Balance is: %f", n->data->money);
        }
    }
}

void withdraw_money(struct linked_list *list, int cardnumber) {
    for (struct node *n = list->head; n != NULL; n = n->next) {
        if (n->data->card_number == cardnumber) {
            printf_s("\nWelcome to Letran Bank\n\n");
            printf_s("WITHDRAW MONEY\n");
            printf_s("Enter amount to be withdrawn: ");
            scanf("%f", &moneyinput);

            if (moneyinput <= n->data->money) {
                n->data->money -= moneyinput;
                printf_s("Withdrawal success.\n");
            } else {
                printf_s("Insufficient Balance.\n");
            }

            printf_s("Current Balance is: %f", n->data->money);
        }
    }
}

void check_balance(struct linked_list *list, int cardnumber) {
    for (struct node *n = list->head; n != NULL; n = n->next) {
        if (n->data->card_number == cardnumber) {
            printf_s("\nWelcome to Letran Bank\n\n");
            printf_s("CHECK BALANCE\n");
            printf_s("Your Current Savings Balance is Php %f \n\n", n->data->money);
        }
    }
}

void search_records(struct linked_list *list) {
    printf_s("\nWelcome to Letran Bank\n\n");
    printf_s("VIEW RECORDS\n");

    int input;
    printf("Search card number: ");
    scanf_s("%d", &input);

    printf("%3s %11s %25s %20s\n", "ID", "CARD NUMBER", "NAME", "BALANCE");
    for (struct node *n = list->head; n != NULL; n = n->next) {
        if (n->data->card_number == input) {
            printf("%3d %11d %25s %20f\n", n->data->id, n->data->card_number, n->data->name, n->data->money);
        }

    }
}

int authentication(struct linked_list *list, int cardnumber, int pin) {
    for (struct node *n = list->head; n != NULL; n = n->next) {
        if (cardnumber == 123456) {
            if (pin == 123456) {
                return 1;
            } else {
                return 3;
            }
        } else if (n->data->card_number == cardnumber) {
            if (n->data->pin == pin) {
                return 2;
            } else {
                return 3;
            }
        }
    }
}

int main() {
    int currentcard;

    //creates new list
    struct linked_list *list = new_list();

    //creates new values to be added to nodes;
    struct client *c1 = new_client(1, 123456, "Admin", 123456, 0);
    struct client *c2 = new_client(2, 111111, "Nicolei Esperida", 111111, 1000);
    struct client *c3 = new_client(3, 666666, "Hudas", 666666, 666);

    //creates new nodes and add the values
    struct node *n1 = new_node(c1);
    struct node *n2 = new_node(c2);
    struct node *n3 = new_node(c3);

    //add each nodes to the list
    list_add(list, n1);
    list_add(list, n2);
    list_add(list, n3);

    while (choiceinput != 6) {
        printf_s("Welcome to LETRAN BANK\n\n");
        printf("Enter cardnumber: ");
        scanf_s("%d", &cardinput);
        currentcard = cardinput;

        printf("Enter pin: ");
        scanf_s("%d", &passinput);
        if (authentication(list, cardinput, passinput) == 1) {
            while (choiceinput != 5) {
                printf("\nWelcome to Letran Bank, Admin!\n\n");
                printf("[1] View all records\n");
                printf("[2] Delete records\n");
                printf("[3] Modify records\n");
                printf("[4] Search records\n");
                printf("[5] Logout\n");
                printf("[6] Terminate\n");
                printf("Enter choice: ");
                scanf_s("%d", &choiceinput);

                switch (choiceinput) {
                    case 1:
                        list_print(list);
                        break;
                    case 2:
                        //delete_records(list);
                        break;
                    case 3:
                        //modify_records(list);
                        break;
                    case 4:
                        search_records(list);
                        break;
                    case 5:
                        break;
                    case 6:
                        break;
                    default:
                        printf_s("Invalid input.\n");
                        break;
                }
            }
        } else if (authentication(list, cardinput, passinput) == 2) {
            while (choiceinput != 5) {
                printf("\nWelcome to Letran Bank\n\n");
                printf("[1] Check Balance\n");
                printf("[2] Withdraw\n");
                printf("[3] Deposit\n");
                printf("[4] Change Pin\n");
                printf("[5] Logout\n");
                printf("[6] Terminate\n");
                printf("Enter choice: ");
                scanf_s("%d", &choiceinput);

                switch (choiceinput) {
                    case 1:
                        check_balance(list, currentcard);
                        break;
                    case 2:
                        withdraw_money(list, currentcard);
                        break;
                    case 3:
                        deposit_money(list, currentcard);
                        break;
                    case 4:
                        change_pin(list, currentcard);
                        break;
                    case 5:
                        break;
                    case 6:
                        break;
                    default:
                        printf_s("Invalid input.\n");
                        break;
                }
            }
        } else if (authentication(list, cardinput, passinput)) {
            printf("Wrong Pin.\n");
        } else {
            printf("User doesn't exist.\n");
        }
    }

    return 0;
}

///ADMIN///
void delete_records() {
    printf_s("\nWelcome to Letran Bank\n\n");
    printf_s("VIEW RECORDS\n");
}

void modify_records() {
    printf_s("\nWelcome to Letran Bank\n\n");
    printf_s("VIEW RECORDS\n");
}