Bank Account Management System

As of now, C program operations are performed on a prompt or terminal that is not saved anywhere. But in the software sector, the majority of applications are created to store the data they get. Keeping the information that was retrieved in a file is one such method. On a file, many operations can be carried out, including:

Making a new file (using the fopen command with the "a" or "a+" or "w" or "w+" attributes)
launching a current file (fopen)
examining a file (fscanf or fgets)
creating a file (fprintf or fputs)
Accessing a particular spot in a file (fseek, rewind)
filing a closure (fclose)

Our Approach

Let's go through the strategy in depth, going over each function and a detailed description of each. In the main function, construct a Menu and several functions that will be invoked using switch case statements. There are four distinct purposes:

account()- This function is used to create a new account.
transfermoney()- This function is used to transfer money to the account
checkbalance()- This function is used to check the balance in the account.
login()- This function is used to login into the account.

Create an account for our user by executing the account() method first, and then utilize file handling functions to put all the data in a file. The user may then use the transfermoney() method to send money to other users, and the checkbalance() function can be used to check the account's current balance.

In order to save user data and read it all later, concepts of file handling will be employed. Because file structures are simple to write and read, they will be used to store user data.

Program Breakdown

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

We will include all the necessary files to avoid any kind of error in our bank account management system program.

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

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

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

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

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

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

 printf ( " \ n \ n DATE OF BIRTH.. " ) ;
 printf ( " \ n DATE - " ) ;
 scanf ( " % d " , &u1.date ) ;
 printf ( " \ n MONTH - " ) ;
 scanf ( " % d " , &u1.month ) ;
 printf ( " \ n YEAR - " ) ;
 scanf ( " % d " , &u1.year ) ;

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

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

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

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

 // 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 ( ) ;
}

Create a structure using all of the user's input so that the data may be stored in a 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 transferred
 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 TRANSFERRED .. " ) ;
 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 TRANSFERRED .... " ) ;
 getch ( ) ;

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

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

Open the file with the username of the user to whom the money should be transferred, enter the amount, and then close the file.

// 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 ( " TRANSACTION 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 ) ;
}

Opening a file containing all the transfer records, reading them one at a time, and comparing them to the username supplied to the function to retrieve the appropriate transfer records.

// 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 ( ) ;
}

In order to provide login capability, we open the file, compare the username entered by the user during registration, and, if the username is accurate and matches the record already in our file, log the user in.

Program for Bank Account Management system in 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-Prateek");

	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 USERNAME 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();
}

// Successful 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 transferred
	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 TRANSFERRED..");
	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 TRANSFERRED....");
	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("TRANSACTION 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:

                    WELCOME TO BANK ACCOUNT SYSTEM

                  **********************************

                         DEVELOPER-Prateek Tomar


                    1.... CREATE A BANK ACCOUNT

                    2.... ALREADY A USER? SIGN IN

                    3.... EXIT
!!!!!CREATE ACCOUNT!!!!!

FIRST NAME..First_name
LAST NAME..Last_name
FIRST NAME..First_name



LAST NAME..Last_name
FATHER's NAME..Mr Father
MOTHER's NAME.. Mrs Mother
ADDRESS..Addres/2 block A
ACCOUNT TYPE 
DATE OF BIRTH..00-00-000
DATE- 00
MONTH- 00
YEAR- 00
ADHAR NUMBER 51235123512
PHONE NUMBER 71223124
PLEASE WAIT.... 
YOUR DATA IS PROCESSING.... 
                              ACCOUNT CREATED SUCCESSFULLY....Press enter to login
ACCOUNT LOGIN 


* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
                     ==== LOG IN ====USERNAME.. 12345
PASSWORD..***
//logged in

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