Core Banking System (COBOL)

This is a demonstration of a simplified Core Banking System implemented in COBOL.

Components

• ACCOUNTS.CPY: Data structure for account records.
• INIT-DB.CBL: Initializes the ACCOUNTS.DAT file with sample data.
• TRANS-PROC.CBL: Handles deposits and withdrawals.
• REPORT-GEN.CBL: Generates a balance summary report.
• BANK-MAIN.CBL: Main menu driver for the system.

How to Run

Prerequisites

• GnuCOBOL (OpenCOBOL): You need cobc installed and in your PATH.
  • Windows: GnuCOBOL for Windows or use msys2
  • Linux: sudo apt-get install gnucobol

Installation on Windows

Install on MSYS2 MINGW64:

pacman -Sy
pacman -S mingw-w64-x86_64-gnucobol
cobc --version

Installation on Linux

sudo apt-get install gnucobol

Compilation & Execution

Since COBOL programs often call each other, you should compile them as modules or dynamic libraries.

# Set environment variables (Windows)
$env:COB_CONFIG_DIR = "C:\msys64\mingw64\share\gnucobol\config"
$env:COB_COPY_DIR = "C:\msys64\mingw64\share\gnucobol\copy"

# Compile all modules
cobc -m INIT-DB.CBL
cobc -m TRANS-PROC.CBL
cobc -m REPORT-GEN.CBL
cobc -x BANK-MAIN.CBL

# Run the main program
./BANK-MAIN

Features

1. Database Initialization: Resets the ACCOUNTS.DAT file to a known state.
2. Transaction Processing: Supports real-time updates for deposits and withdrawals.
3. Reporting: Provides a formatted summary of all accounts and total bank balance.

Note on File Handling

In this simplified version, the transaction processor uses a temporary file (ACCOUNTS.TMP) to perform updates and simulate a sequential record update process typical in batch COBOL environments.