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-
- 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-
- 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.
- 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.
- 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 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("transferring 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); }
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("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); }
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 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 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 ( "transferring 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