main.c

/*HARI   OM!!!
Account captcha
Author:- Shashwat Hiregoudar
Version: 1.0.0   2152
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include<conio.h>
#include <time.h>
#include <stdbool.h>
#define MIN_DEBIT_BALANCE 5000
#define MIN_BALANCE 1000
#define NAMELENGTH 15
#define TRUE 1
#define FALSE 0
#define ADMINPASSWORD 007
struct account_details
{
    int id;
    char fname[NAMELENGTH];
    char lname[NAMELENGTH];
    //   struct name name;
    int acc_num;
    int pin;
    float balance;
    char account_type;
    //struct dob dob;
};
struct node
{
    struct account_details account;
    struct node *next;
};
typedef struct node *NODEPTR;
NODEPTR load_all();
NODEPTR getnode();
int set_pin();
void signup();
void transfer(NODEPTR sender, NODEPTR receiver);
NODEPTR load_details(int accnum);
int generate_account_number();
void printdetails(NODEPTR p);
void write_to_file(struct account_details ac);
void deposit(NODEPTR p);
void withdraw(NODEPTR p);
void apply_debit_card(NODEPTR p);
NODEPTR search_account(NODEPTR base, int accountno, int accountpin);
void signin(NODEPTR list);
void do_transactions(NODEPTR p, NODEPTR list);
void admin_access();
int generate_debit_pin();
NODEPTR searchByAccountnum(NODEPTR list, int accnum);
void file_update(NODEPTR list);
int main()
{
    NODEPTR p = NULL;
    int choice, signinchoice;
    printf("Welcome to Gringott's Bank\n");
    printf("\nEnter 1 to sign up\n");
    printf("\nEnter 2 to sign in\n");
    scanf("%d", &choice);
    switch (choice)
    {
    case 1:
        signup();
        break;
    case 2:
        printf("\nEnter \n1-> to login as admin\n2->to login as customer\n");
        scanf("%d", &signinchoice);
        switch (signinchoice)
        {
        case 1:
            admin_access();
            break;
        case 2:
            p = load_all();
            signin(p);
            //To pass p it should have been loaded all the accounts here it is not done so segmentation fault occurs
            break;
        default:
            printf("Invalid Entry \n");
            exit(1);
        }
        break;
    default:
        printf("Invalid choice\n");
        printf("Please enter valid choice\n");
    }

    printf("Now we will print the updaTED \n");
    NODEPTR temp = p;
    while (temp != NULL)
    {
        printdetails(temp);
        temp = temp->next;
    }
    file_update(p);
    return 0;
}
NODEPTR load_all()
{

    FILE *fptr;
    int s;
    NODEPTR temp = NULL, base;
    struct account_details accountt;
    fptr = fopen("documentary.dat", "r");
    if (temp == NULL)
    {
        fread(&accountt, sizeof(struct account_details), 1, fptr);
        temp = getnode();
        base = temp;
        //temp->account.account_type=account.account_type;
        temp->account.acc_num = accountt.acc_num;
        temp->account.balance = accountt.balance;
        strcpy(temp->account.fname, accountt.fname);
        //temp->account.id=account.id;
        strcpy(temp->account.lname, accountt.lname);
        temp->account.pin = accountt.pin;
    }
    while (fread(&accountt, sizeof(accountt), 1, fptr))
    {
        temp->next = getnode();
        temp = temp->next;
        //temp->account.account_type=account.account_type;
        temp->account.acc_num = accountt.acc_num;
        temp->account.balance = accountt.balance;
        strcpy(temp->account.fname, accountt.fname);
        //temp->account.id=account.id;
        strcpy(temp->account.lname, accountt.lname);
        temp->account.pin = accountt.pin;
    }
    temp->next = NULL;
    fclose(fptr);
    return (base);
}
NODEPTR getnode()
{
    NODEPTR p;
    p = (NODEPTR)malloc(sizeof(struct node));
    if (p == NULL)
    {
        printf("Insufficient Heap Memory Available\n");
        exit(1);
    }
    p->next = NULL;
    return p;
}
int generate_account_number()
{
    int number;
    //initialize random seed:
    srand(time(NULL));
    //generate a random number: 		                                                                    ///Show to all
    number = rand() % 1000 + 1;
    printf("%d ", number); //Substitute to generate random numbers without repetition (uses time.h)
    return (number);
}
int set_pin()
{
    int teddy = 0;
    int temp;
    while (teddy == 0)
    {
        printf("\nEnter a pin\nIt will be set as your password\n");

        if (scanf("%d", &temp) != 1)
        {
            printf("\nEnter a valid password\n");
            teddy = 0;
        }
        teddy = 1;
    }
    return temp;
}
void signup()
{
    NODEPTR p;
    int x;
    float bal;
    p = getnode();
    printf("\nEnter details\n");
    printf("\nEnter your first name\n");
    scanf("%s", p->account.fname);
    printf("\nEnter your last name\n");
    scanf("%s", p->account.lname);
    p->account.pin = set_pin();
    printf("To create this account we need a minimum balance of Rs%d/-\nPlease deposit initial Balance\n", MIN_BALANCE);
    scanf("%f", &bal);
    if (bal >= MIN_BALANCE)
        p->account.balance = bal;
    else
    {
        printf("Insufficient funds\n");
        exit(1);
    }
    x = generate_account_number();
    p->account.acc_num = x;
    printf("Your account number is %d\n", x);
    p->next = NULL;
    printf("Your details entered are\n");
    printdetails(p);
    write_to_file(p->account);
}
void write_to_file(struct account_details ac)
{
    FILE *fp = fopen("documentary.dat", "a");
    fwrite(&ac, sizeof(ac), 1, fp);
    printf("Successfully written\n");
    fclose(fp);
}
void printdetails(NODEPTR p)
{
    printf("Name:%s %s\n", p->account.fname, p->account.lname);
    printf("Balance: %f\n", p->account.balance);
    printf("Acc Num:%d\n", p->account.acc_num);
}
void deposit(NODEPTR p)
{
    float amt;
    printf("\nEnter the amount to be deposited\n");
    scanf("%f", &amt);
    p->account.balance += amt;
    /*Displaying modified account details_display()*/
    //q.front--;
}
void withdraw(NODEPTR p)
{
    float amt;
    printf("\nEnter amount to be withdrawn\n");
    scanf("%f", &amt);
    p->account.balance -= amt;

    /*Display updated account*/
}
void apply_debit_card(NODEPTR p)
{
    int dpin;
    if (p->account.balance >= MIN_DEBIT_BALANCE)
    {
        printf("You are eligible to apply for debit card\n");
        dpin = generate_account_number();
        printf("Your debit card pin is %d\n", dpin);
        printf("This is confidential\n");
        printf("Please, do not disclose your pin to anyone\n");
    }
    else
    {
        printf("Since your balance is below Rs 5000, you are ineligible to apply for debit card\n");
    }
}
int generate_debit_pin()
{
    int flag;
    flag = rand() % 1000 + 10;
    return flag;
}
void pay_interest(NODEPTR p)
{
    struct account_details account;
    float interest;
    interest = 6;
    p->account.balance = p->account.balance + (p->account.balance * interest);
}
NODEPTR search_account(NODEPTR base, int accountno, int accountpin) ////good while administrator
{
    NODEPTR temp = NULL;
    temp = base;
    while (temp != NULL)
    {
        if (temp->account.acc_num == accountno && temp->account.pin == accountpin)
            return (temp);
        else
            temp = temp->next;
    }
    return NULL;
}
void signin(NODEPTR list)
{
    int accountnumber;
    int accountpin;
    int ted = 0;
    int ch;
    NODEPTR p;
    while (ted == 0)
    {
        printf("\nEnter your account number:");
        scanf("%d", &accountnumber);
        printf("\nEnter pin:");
        scanf("%d", &accountpin);
        p = search_account(list, accountnumber, accountpin);
        if (p == NULL)
        {
            printf("Account Number or the password does not match\n");
            ted = 0;
        }
        else
            ted = 1;
    }
    do
    {
        do_transactions(p, list);
        printdetails(p);
        printf("\n Enter 1 to continue the transactions :-");
        scanf("%d", &ch);
    } while (ch == 1);
}
void do_transactions(NODEPTR p, NODEPTR list)
{
    NODEPTR q;
    int choice;
    int bear = 0;
    int option;
    printf("\nEnter 1->withdraw\n\n");
    printf("\nEnter 2->deposit\n\n");
    printf("\nEnter 3->apply for debit\n\n");
    printf("\nEnter 4->transfer amount\n\n");
    scanf("%d", &choice);
    int accnum;
    switch (choice)
    {
    case 1:
        withdraw(p);
        break;
    case 2:
        deposit(p);
        break;
    case 3:
        apply_debit_card(p);
        break;
    case 4:
        while (bear == 0)
        {
            printf("\nEnter the account number to whom you want to send\n");
            scanf("%d", &accnum);
            q = searchByAccountnum(list, accnum);
            if (q == NULL)
            {
                bear = 0;
                continue;
            }
            printf("Did you mean by the person\n%s %s\nwhose account number is%d\nif yes press 1\nelse press anything other than 1\n", q->account.fname, q->account.lname, q->account.acc_num);

            scanf("%d", &option);
            if (option == 1)
                break;
            else
                bear = 1;
            printf("Please try again\n\nEnter a valid account number\n\n");
        }
        transfer(p, q);
        break;
    default:
        printf("Invalid option entry\n");
    }
}
NODEPTR searchByAccountnum(NODEPTR list, int accnum)
{

    NODEPTR temp = NULL;
    temp = list;
    while (temp != NULL)
    {
        if (temp->account.acc_num == accnum)
            return (temp);
        else
            temp = temp->next;
    }
    return NULL;
}
void transfer(NODEPTR sender, NODEPTR receiver)
{
    int amt;
    printf("\nEnter the amount you want to transfer\n\n");
    scanf("%d", &amt);
    sender->account.balance -= amt;
    receiver->account.balance += amt;
}
void admin_access()
{
    int entered_password;
    int ted = 0;
    NODEPTR p;
    while (ted == 0)
    {
        printf("\nEnter the password\n\n");
        scanf("%d", &entered_password);
        if (entered_password != 007)
        {
            printf("Incorrect password\n");
            printf("Please Try Again!\n");
            ted = 0;
        }
        else
            ted = 1;
    }
    p = load_all();
    NODEPTR q;
    q = p;
    while (q != NULL)
    {
        printdetails(q);
        q = q->next;
    }
}
void file_update(NODEPTR list)
{
    struct account_details ac;
    FILE *fptr = fopen("documentary.dat", "w");
    while (list != NULL)
    {
        fwrite(&ac, sizeof(ac), 1, fptr);
        list = list->next;
    }
    fclose(fptr);
}
void update_details(NODEPTR p)
{
    char localfname[20];
    char locallname[20];
    int localpin;
    int flag;
    struct account_details account;
    printf("1-> To change only first name\n");
    printf("2-> To change only last name\n");
    printf("3->To change only pin\n");
    scanf("%d", &flag);
    printf("\nEnter account number whose details need to be changed");
    search_account(p, account.acc_num, localpin);
    switch (flag)
    {
    case 1:
        printf("\nEnter name to be updated/modified\n");
        gets(localfname);
        strcpy(p->account.fname, localfname);
        break;
    case 2:
        printf("\nEnter last name to be updated/modified\n");
        gets(locallname);
        strcpy(locallname, p->account.lname);
        break;
    case 3:
        printf("\nEnter pin to be changed\n");
        scanf("%d", &localpin);
        p->account.pin = localpin;
        break;
    default:
        printf("Invalid choice\n");
    }
}