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Bank account system in C using File handling

  • Last Updated : 07 Aug, 2021

This article focuses on how to create a bank account system using C language and File handling in C.

Approach:
Let’s discuss the approach in detail, covering all the functions and their explanation in detail-

  1. Create a Menu in the main function and create different functions for the Menu, which will be called using switch case statements. There are four different functions-
    1. account()- This function is used to create a new account.
    2. transfermoney()- This function is used to transfer money to the account
    3. checkbalance()- This function is used to check the balance in the account.
    4. login()- This function is used to login into the account.
  2. First, create an account of our user by calling the account() function after the creation of an account, store all the data into a file using file handling functions.
  3. Then the user is able to transfer the amount to other users, for that transfermoney() function is called, and for checking the current balance in the account call checkbalance() function.

Concepts of file handling will be used to store the data of the users, and then read all data from that particular file, store structures in a file because they are easy to write and read.

Implementation:
Let’s look at the C implementation of each of the modules of the program and finally consolidate all the modules together and create a full working program.

1. Create a Bank Account-
Take all the input from the user and make a structure for it to store the data in a file. 



// Function to create accounts 
// of users
void account(void)
{
 char password[20];
 int passwordlength, i, seek = 0;
 char ch;
 FILE *fp, *fu;
 struct pass u1;
 struct userpass p1;

 struct userpass u2;

 // Opening file to  
 // write data of a user
 fp = fopen("username.txt", "ab");

 // Inputs
 system("cls");
 printf("\n\n!!!!!CREATE ACCOUNT!!!!!");

 printf("\n\nFIRST NAME..");
 scanf("%s", &u1.fname);

 printf("\n\n\nLAST NAME..");
 scanf("%s", &u1.lname);

 printf("\n\nFATHER's NAME..");
 scanf("%s", &u1.fathname);

 printf("\n\nMOTHER's NAME..");
 scanf("%s", &u1.mothname);

 printf("\n\nADDRESS..");
 scanf("%s", &u1.address);

 printf("\n\nACCOUNT TYPE");
 scanf("%s", &u1.typeaccount);

 printf("\n\nDATE OF BIRTH..");
 printf("\nDATE-");
 scanf("%d", &u1.date);
 printf("\nMONTH-");
 scanf("%d", &u1.month);
 printf("\nYEAR-");
 scanf("%d", &u1.year);

 printf("\n\nADHAR NUMBER");
 scanf("%s", u1.adharnum);

 printf("\n\nPHONE NUMBER");
 scanf("%s", u1.pnumber);

 printf("\n\nUSERNAME.. ");
 scanf("%s", &u1.username);

 printf("\n\nPASSWORD..");

 // Taking password in the  
 // form of stars
 for (i = 0; i < 50; i++)  
 {
   ch = getch();
   if (ch != 13)  
   {
     password[i] = ch;
     ch = '*';
     printf("%c", ch);
   }
   else
     break;
 }

 // Writing to the file
 fwrite(&u1, sizeof(u1), 1, fp);

 // Closing file
 fclose(fp);

 // Calling another function  
 // after successful creation
 // of account
 accountcreated();
}

2. Transfer Money-
Take the username of another user to whom we want to transfer the money and open his record in the file and write the amount to the file.

// Function to transfer
// money from one user to
// another
void transfermoney(void)
{
 int i, j;
 FILE *fm, *fp;
 struct pass u1;
 struct money m1;
 char usernamet[20];
 char usernamep[20];
 system("cls");

 // Opening file in read mode to  
 // read user's username
 fp = fopen("username.txt", "rb");

 // Creating a another file  
 // to write amount along with
 // username to which amount  
 // is going to be transfered
 fm = fopen("mon.txt", "ab");

 gotoxy(33, 4);
 printf("---- TRANSFER MONEY ----");
 gotoxy(33, 5);
 printf("========================");

 gotoxy(33, 11);
 printf("FROM (your username).. ");
 scanf("%s", &usernamet);

 gotoxy(33, 13);
 printf(" TO (username of person)..");
 scanf("%s", &usernamep);

 // Checking for username if it  
 // is present in file or not
 while (fread(&u1, sizeof(u1), 1, fp))

 {
   if (strcmp(usernamep,
              u1.username) == 0)  
   {
     strcpy(m1.usernameto,
            u1.username);
     strcpy(m1.userpersonfrom,  
            usernamet);
   }
 }
 gotoxy(33, 16);

 // Taking amount input
 printf("ENTER THE AMOUNT TO BE TRANSFERED..");
 scanf("%d", &m1.money1);

 // Writing to the file
 fwrite(&m1, sizeof(m1), 1, fm);

 gotoxy(0, 26);
 printf(
   "--------------------------------------------------"
   "--------------------------------------------");

 gotoxy(0, 28);
 printf(
   "--------------------------------------------------"
   "--------------------------------------------");

 gotoxy(0, 29);
 printf("transfering amount, Please wait..");

 gotoxy(10, 27);
 for (i = 0; i < 70; i++)
 {
   for (j = 0; j < 1200000; j++)  
   {
     j++;
     j--;
   }
   printf("*");
 }

 gotoxy(33, 40);
 printf("AMOUNT SUCCESSFULLY TRANSFERED....");
 getch();

 // Close the files
 fclose(fp);
 fclose(fm);

 // Function to return  
 // to the home screen
 display(usernamet);
}

3. Check Balance-
Opening a file in which all the transfer records are written and read them one by one and match the username passed in the function to fetch the correct transfer records. 

// Function to check balance
// in users account
void checkbalance(char username2[])
{
 system("cls");
 FILE* fm;
 struct money m1;
 char ch;
 int i = 1, summoney = 0;

 // Opening amount file record
 fm = fopen("mon.txt", "rb");

 int k = 5, l = 10;
 int m = 30, n = 10;
 int u = 60, v = 10;

 gotoxy(30, 2);
 printf("==== BALANCE DASHBOARD ====");
 gotoxy(30, 3);
 printf("***************************");
 gotoxy(k, l);
 printf("S no.");
 gotoxy(m, n);
 printf("TRANSCATION ID");
 gotoxy(u, v);
 printf("AMOUNT");

 // Reading username to
 // fetch the correct record
 while (fread(&m1, sizeof(m1), 1, fm))  
 {
   if (strcmp(username2,  
              m1.usernameto) == 0)  
   {
     gotoxy(k, ++l);
     printf("%d", i);
     i++;
     gotoxy(m, ++n);
     printf("%s", m1.userpersonfrom);

     gotoxy(u, ++v);
     printf("%d", m1.money1);
     // adding and
     // finding total money
     summoney = summoney + m1.money1;
   }
 }

 gotoxy(80, 10);
 printf("TOTAL AMOUNT");

 gotoxy(80, 12);
 printf("%d", summoney);

 getch();

 // Closing file after  
 // reading it
 fclose(fm);
 display(username2);
}

4. Login Functionality-
To add Login functionality, we are opening the file and matching the username provided by the user at the time of registration, and logging in to him if the username is correct and matches with the record present in our file.

// Login function to check
// the username of the user
void login(void)
{
 system("cls");

 char username[50];
 char password[50];

 int i, j, k;
 char ch;
 FILE *fp, *fu;
 struct pass u1;
 struct userpass u2;

 // Opening file of
 // user data
 fp = fopen("username.txt", "rb");

 if (fp == NULL)  
 {
   printf("ERROR IN OPENING FILE");
 }
 
 gotoxy(34, 2);
 printf(" ACCOUNT LOGIN ");
 gotoxy(7, 5);
 printf("***********************************************"
        "********************************");

 gotoxy(35, 10);
 printf("==== LOG IN ====");

 // Take input
 gotoxy(35, 12);
 printf("USERNAME.. ");
 scanf("%s", &username);

 gotoxy(35, 14);
 printf("PASSWORD..");
 // Input the password
 for (i = 0; i < 50; i++)  
 {
   ch = getch();
   if (ch != 13)
   {
     password[i] = ch;
     ch = '*';
     printf("%c", ch);
   }

   else
     break;
 }

 // Checking if username
 // exists in the file or not
 while (fread(&u1,  
              sizeof(u1), 1, fp))  
 {
   if (strcmp(username,  
              u1.username) == 0)  
   {
     loginsu();
     display(username);
   }
 }

 // Closing the file
 fclose(fp);
}

// Screen is shown after  
// successful login
void loginsu(void)
{
 int i;
 FILE* fp;
 struct pass u1;
 system("cls");
 printf("Fetching account details.....\n");
 for (i = 0; i < 20000; i++)  
 {
   i++;
   i--;
 }
 gotoxy(30, 10);
 printf("LOGIN SUCCESSFUL....");
 gotoxy(0, 20);
 printf("Press enter to continue");

 getch();
}

Complete Program-
Below is the complete C program for the bank system using the concepts of file handling-

C




// C program to implement
// the above approach
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
 
// Declaring all the functions
void checkbalance(char*);
void transfermoney(void);
void display(char*);
void person(char*);
void login(void);
void loginsu(void);
void account(void);
void accountcreated(void);
void afterlogin(void);
void logout(void);
 
// Declaring gotoxy
// function for setting
// cursor position
void gotoxy(int x, int y)
{
    COORD c;
    c.X = x;
    c.Y = y;
 
    SetConsoleCursorPosition(
        GetStdHandle(STD_OUTPUT_HANDLE), c);
}
 
// Creating a structure to store
// data of the user
struct pass {
    char username[50];
    int date, month, year;
    char pnumber[15];
    char adharnum[20];
    char fname[20];
    char lname[20];
    char fathname[20];
    char mothname[20];
    char address[50];
    char typeaccount[20];
};
 
// Structure to keep track
// of amount transfer
struct money {
    char usernameto[50];
    char userpersonfrom[50];
    long int money1;
};
 
struct userpass {
    char password[50];
};
 
// Driver Code
int main()
{
    int i, a, b, choice;
    int passwordlength;
 
    gotoxy(20, 3);
 
    // Creating a Main
    // menu for the user
    printf("WELCOME TO BANK ACCOUNT SYSTEM\n\n");
    gotoxy(18, 5);
 
    printf("**********************************");
    gotoxy(25, 7);
 
    printf("DEVELOPER-Naman kumar");
 
    gotoxy(20, 10);
    printf("1.... CREATE A BANK ACCOUNT");
 
    gotoxy(20, 12);
    printf("2.... ALREADY A USER? SIGN IN");
    gotoxy(20, 14);
    printf("3.... EXIT\n\n");
 
    printf("\n\nENTER YOUR CHOICE..");
 
    scanf("%d", &choice);
 
    switch (choice) {
    case 1:
        system("cls");
        printf("\n\n UESERNAME 50 CHARACTERS MAX!!");
        printf("\n\n PASSWORD 50 CHARACTERS MAX!!");
        account();
        break;
 
    case 2:
        login();
        break;
 
    case 3:
        exit(0);
        break;
 
        getch();
    }
}
 
// Function to create accounts
// of users
void account(void)
{
    char password[20];
    int passwordlength, i, seek = 0;
    char ch;
    FILE *fp, *fu;
    struct pass u1;
    struct userpass p1;
 
    struct userpass u2;
 
    // Opening file to
    // write data of a user
    fp = fopen("username.txt", "ab");
 
    // Inputs
    system("cls");
    printf("\n\n!!!!!CREATE ACCOUNT!!!!!");
 
    printf("\n\nFIRST NAME..");
    scanf("%s", &u1.fname);
 
    printf("\n\n\nLAST NAME..");
    scanf("%s", &u1.lname);
 
    printf("\n\nFATHER's NAME..");
    scanf("%s", &u1.fathname);
 
    printf("\n\nMOTHER's NAME..");
    scanf("%s", &u1.mothname);
 
    printf("\n\nADDRESS..");
    scanf("%s", &u1.address);
 
    printf("\n\nACCOUNT TYPE");
    scanf("%s", &u1.typeaccount);
 
    printf("\n\nDATE OF BIRTH..");
    printf("\nDATE-");
    scanf("%d", &u1.date);
    printf("\nMONTH-");
    scanf("%d", &u1.month);
    printf("\nYEAR-");
    scanf("%d", &u1.year);
 
    printf("\n\nADHAR NUMBER");
    scanf("%s", u1.adharnum);
 
    printf("\n\nPHONE NUMBER");
    scanf("%s", u1.pnumber);
 
    printf("\n\nUSERNAME.. ");
    scanf("%s", &u1.username);
 
    printf("\n\nPASSWORD..");
 
    // Taking password in the form of
    // stars
    for (i = 0; i < 50; i++) {
        ch = getch();
        if (ch != 13) {
            password[i] = ch;
            ch = '*';
            printf("%c", ch);
        }
        else
            break;
    }
 
    // Writing to the file
    fwrite(&u1, sizeof(u1),
           1, fp);
 
    // Closing file
    fclose(fp);
 
    // Calling another function
    // after successful creation
    // of account
    accountcreated();
}
 
// Successfull account creation
void accountcreated(void)
{
    int i;
    char ch;
    system("cls");
    printf(
        "PLEASE WAIT....\n\nYOUR DATA IS PROCESSING....");
    for (i = 0; i < 200000000; i++) {
        i++;
        i--;
    }
 
    gotoxy(30, 10);
 
    printf("ACCOUNT CREATED SUCCESSFULLY....");
    gotoxy(0, 20);
 
    printf("Press enter to login");
 
    getch();
    login();
}
 
// Login function to check
// the username of the user
void login(void)
{
    system("cls");
 
    char username[50];
    char password[50];
 
    int i, j, k;
    char ch;
    FILE *fp, *fu;
    struct pass u1;
    struct userpass u2;
 
    // Opening file of
    // user data
    fp = fopen("username.txt",
               "rb");
 
    if (fp == NULL) {
        printf("ERROR IN OPENING FILE");
    }
    gotoxy(34, 2);
    printf(" ACCOUNT LOGIN ");
    gotoxy(7, 5);
    printf("***********************************************"
           "********************************");
 
    gotoxy(35, 10);
    printf("==== LOG IN ====");
 
    // Take input
    gotoxy(35, 12);
    printf("USERNAME.. ");
    scanf("%s", &username);
 
    gotoxy(35, 14);
    printf("PASSWORD..");
 
    // Input the password
    for (i = 0; i < 50; i++) {
        ch = getch();
        if (ch != 13) {
            password[i] = ch;
            ch = '*';
            printf("%c", ch);
        }
 
        else
            break;
    }
 
    // Checking if username
    // exists in the file or not
    while (fread(&u1, sizeof(u1),
                 1, fp)) {
        if (strcmp(username,
                   u1.username)
            == 0) {
            loginsu();
            display(username);
        }
    }
 
    // Closing the file
    fclose(fp);
}
 
// Redirect after
// successful login
void loginsu(void)
{
    int i;
    FILE* fp;
    struct pass u1;
    system("cls");
    printf("Fetching account details.....\n");
    for (i = 0; i < 20000; i++) {
        i++;
        i--;
    }
 
    gotoxy(30, 10);
    printf("LOGIN SUCCESSFUL....");
    gotoxy(0, 20);
    printf("Press enter to continue");
 
    getch();
}
 
// Display function to show the
// data of the user on screen
void display(char username1[])
{
    system("cls");
    FILE* fp;
    int choice, i;
    fp = fopen("username.txt", "rb");
    struct pass u1;
 
    if (fp == NULL) {
        printf("error in opening file");
    }
 
    while (fread(&u1, sizeof(u1),
                 1, fp)) {
        if (strcmp(username1,
                   u1.username)
            == 0) {
            gotoxy(30, 1);
            printf("WELCOME, %s %s",
                   u1.fname, u1.lname);
            gotoxy(28, 2);
            printf("..........................");
            gotoxy(55, 6);
            printf("==== YOUR ACCOUNT INFO ====");
            gotoxy(55, 8);
            printf("***************************");
            gotoxy(55, 10);
            printf("NAME..%s %s", u1.fname,
                   u1.lname);
 
            gotoxy(55, 12);
            printf("FATHER's NAME..%s %s",
                   u1.fathname,
                   u1.lname);
 
            gotoxy(55, 14);
            printf("MOTHER's NAME..%s",
                   u1.mothname);
 
            gotoxy(55, 16);
            printf("ADHAR CARD NUMBER..%s",
                   u1.adharnum);
 
            gotoxy(55, 18);
            printf("MOBILE NUMBER..%s",
                   u1.pnumber);
 
            gotoxy(55, 20);
            printf("DATE OF BIRTH.. %d-%d-%d",
                   u1.date, u1.month, u1.year);
 
            gotoxy(55, 22);
            printf("ADDRESS..%s", u1.address);
 
            gotoxy(55, 24);
            printf("ACCOUNT TYPE..%s",
                   u1.typeaccount);
        }
    }
 
    fclose(fp);
 
    gotoxy(0, 6);
 
    // Menu to perform different
    // actions by user
    printf(" HOME ");
    gotoxy(0, 7);
    printf("******");
    gotoxy(0, 9);
    printf(" 1....CHECK BALANCE");
    gotoxy(0, 11);
    printf(" 2....TRANSFER MONEY");
    gotoxy(0, 13);
    printf(" 3....LOG OUT\n\n");
    gotoxy(0, 15);
    printf(" 4....EXIT\n\n");
 
    printf(" ENTER YOUR CHOICES..");
    scanf("%d", &choice);
 
    switch (choice) {
    case 1:
        checkbalance(username1);
        break;
 
    case 2:
        transfermoney();
        break;
 
    case 3:
        logout();
        login();
        break;
 
    case 4:
        exit(0);
        break;
    }
}
 
// Function to transfer
// money from one user to
// another
void transfermoney(void)
{
    int i, j;
    FILE *fm, *fp;
    struct pass u1;
    struct money m1;
    char usernamet[20];
    char usernamep[20];
    system("cls");
 
    // Opening file in read mode to
    // read user's username
    fp = fopen("username.txt", "rb");
 
    // Creating a another file
    // to write amount along with
    // username to which amount
    // is going to be transfered
    fm = fopen("mon.txt", "ab");
 
    gotoxy(33, 4);
    printf("---- TRANSFER MONEY ----");
    gotoxy(33, 5);
    printf("========================");
 
    gotoxy(33, 11);
    printf("FROM (your username).. ");
    scanf("%s", &usernamet);
 
    gotoxy(33, 13);
    printf(" TO (username of person)..");
    scanf("%s", &usernamep);
 
    // Checking for username if it
    // is present in file or not
    while (fread(&u1, sizeof(u1),
                 1, fp))
 
    {
        if (strcmp(usernamep,
                   u1.username)
            == 0) {
            strcpy(m1.usernameto,
                   u1.username);
            strcpy(m1.userpersonfrom,
                   usernamet);
        }
    }
    gotoxy(33, 16);
 
    // Taking amount input
    printf("ENTER THE AMOUNT TO BE TRANSFERED..");
    scanf("%d", &m1.money1);
 
    // Writing to the file
    fwrite(&m1, sizeof(m1),
           1, fm);
 
    gotoxy(0, 26);
    printf(
        "--------------------------------------------------"
        "--------------------------------------------");
 
    gotoxy(0, 28);
    printf(
        "--------------------------------------------------"
        "--------------------------------------------");
 
    gotoxy(0, 29);
    printf("transfering amount, Please wait..");
 
    gotoxy(10, 27);
    for (i = 0; i < 70; i++) {
        for (j = 0; j < 1200000; j++) {
            j++;
            j--;
        }
        printf("*");
    }
 
    gotoxy(33, 40);
    printf("AMOUNT SUCCESSFULLY TRANSFERED....");
    getch();
 
    // Close the files
    fclose(fp);
    fclose(fm);
 
    // Function to return
    // to the home screen
    display(usernamet);
}
 
// Function to check balance
// in users account
void checkbalance(char username2[])
{
    system("cls");
    FILE* fm;
    struct money m1;
    char ch;
    int i = 1, summoney = 0;
 
    // Opening amount file record
    fm = fopen("mon.txt", "rb");
 
    int k = 5, l = 10;
    int m = 30, n = 10;
    int u = 60, v = 10;
 
    gotoxy(30, 2);
    printf("==== BALANCE DASHBOARD ====");
    gotoxy(30, 3);
    printf("***************************");
    gotoxy(k, l);
    printf("S no.");
    gotoxy(m, n);
    printf("TRANSCATION ID");
    gotoxy(u, v);
    printf("AMOUNT");
 
    // Reading username to
    // fetch the correct record
    while (fread(&m1, sizeof(m1),
                 1, fm)) {
        if (strcmp(username2,
                   m1.usernameto)
            == 0) {
            gotoxy(k, ++l);
            printf("%d", i);
            i++;
            gotoxy(m, ++n);
            printf("%s", m1.userpersonfrom);
 
            gotoxy(u, ++v);
            printf("%d", m1.money1);
            // Adding and
            // finding total money
            summoney = summoney + m1.money1;
        }
    }
 
    gotoxy(80, 10);
    printf("TOTAL AMOUNT");
 
    gotoxy(80, 12);
    printf("%d", summoney);
 
    getch();
 
    // Closing file after
    // reading it
    fclose(fm);
    display(username2);
}
 
// Logout function to bring
// user to the login screen
void logout(void)
{
    int i, j;
    system("cls");
    printf("please wait, logging out");
 
    for (i = 0; i < 10; i++) {
        for (j = 0; j < 25000000; j++) {
            i++;
            i--;
        }
        printf(".");
    }
 
    gotoxy(30, 10);
    printf("Sign out successfully..\n");
 
    gotoxy(0, 20);
    printf("press any key to continue..");
 
    getch();
}

Output

Output of the Program 

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