Bank Management System - Interactive Demo

🎯 System Overview

This Bank Management System is a comprehensive C program that manages bank accounts with features like account creation, transactions, and data management. Let's explore how each component works!

🏗️ Data Structures

The system uses structs to organize customer data efficiently:

📊 Customer Record Structure

struct date { int month, day, year; }; struct { char name[10000]; int acc_no, age; char address[60]; char citizenship[15]; double phone; char acc_type[10]; float amt; struct date dob; struct date deposit; struct date withdraw; } add, upd, check, rem, transaction;

Explanation: This struct stores all customer information including personal details, account information, and transaction dates.

🔄 System Flow

1. User Login with Password

2. Main Menu Display

3. User Selects Operation

4. System Executes Function

5. Return to Menu or Exit

📋 Main Menu System

💾 File Operations

The system uses file I/O to persist data:

📁 Data Storage

// File operations example
FILE *ptr;
ptr = fopen("record.dat", "a+");  // Append mode
fprintf(ptr, "%d %s %d/%d/%d %d %s %s %lf %s %f %d/%d/%d\n",
        add.acc_no, add.name, add.dob.month, add.dob.day, add.dob.year,
        add.age, add.address, add.citizenship, add.phone,
        add.acc_type, add.amt, add.deposit.month, add.deposit.day, add.deposit.year);
                

How it works: Customer data is stored in a text file with space-separated values for easy retrieval.

🔍 Key Functions Explained

1. Account Creation (new_acc)

// Validates unique account number
// Collects customer details
// Stores in file
                    

Creates new accounts with validation for duplicate account numbers.

2. Transaction Processing (transact)

// Handles deposits and withdrawals
// Updates account balance
// Prevents transactions on fixed deposits
                    

Manages financial transactions with proper validation.

3. Account Management (edit/erase)

// Updates customer information
// Deletes accounts safely
// Maintains data integrity
                    

Allows modification and deletion of account records.

4. Data Retrieval (see/view_list)

// Searches by account number or name
// Displays customer details
// Lists all accounts
                    

Provides multiple ways to access and view account information.

🧮 Jakat Calculator

A special feature for Islamic banking:

// Jakat calculation logic
if(add.amt >= 80000) {
    double jakat = (2.5/100) * add.amt;
    printf("Zakat amount: %.2f\n", jakat);
}
                

How it works:

Checks if account balance exceeds 80,000 Taka
Calculates 2.5% of the total amount
Displays the zakat amount to be paid

🔐 Security Features

// Password protection
char pass[10], password[10] = "LeadCoder";
if(strcmp(pass, password) == 0) {
    // Grant access
    menu();
} else {
    // Retry or exit
}
                

Security measures:

Hard-coded password protection
Multiple retry attempts allowed
Clean exit on failure

⚡ Real-time Execution Flow

Here's how the system processes a typical transaction:

// Step 1: User selects transaction
printf("Enter account no: ");
scanf("%d", &transaction.acc_no);

// Step 2: System searches account
while(fscanf(ptr, "%d %s...", &add.acc_no, ...) != EOF) {
    if(add.acc_no == transaction.acc_no) {
        // Account found
    }
}

// Step 3: Process transaction
if(choice == 1) {  // Deposit
    add.amt += transaction.amt;
} else {  // Withdraw
    add.amt -= transaction.amt;
}
                

Execution steps:

User provides account number
System searches through file records
Validates account type (fixed deposits restricted)
Updates balance and rewrites file
Provides success/failure feedback

📂 View Source Code

Explore the complete C source code for this banking system on GitHub

View on GitHub

🎯 Learning Outcomes

By studying this system, you'll learn:

File I/O operations in C
Struct usage for data organization
Menu-driven programming
Data validation and error handling
Financial calculation logic
System design principles

This system demonstrates real-world application of C programming concepts in banking software development. Developed by Kamrul Islam.

Shahriah Based Bank Management System