CodeAlpha Banking System

A console-based Bank Account Management System written in C, built as part of the CodeAlpha C Programming Internship — Task 4.

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Features

• Create Account — set up a new bank account with an opening deposit
• Deposit — add funds to any existing account
• Withdraw — withdraw funds with real-time balance validation
• Balance Enquiry — instantly check current balance
• Mini Statement — view the last 10 transactions with date and time
• Display All Accounts — overview of every account in the system
• Persistent Storage — all data is saved to a binary file (accounts.dat), so nothing is lost between runs

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Tech Stack

• Language: C (C99)
• File handling: binary I/O with fread / fwrite
• Data structures: struct with embedded transaction history
• Standard libraries: stdio.h, stdlib.h, string.h, time.h

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Build & Run

# Compile
gcc -o banking_system banking_system.c

# Run
./banking_system

Or use the Makefile:

make
./banking_system

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Project Structure

CodeAlpha_BankingSystem/
├── banking_system.c   # full source code
├── Makefile           # build config
├── .gitignore         # ignores binary and data files
└── README.md          # this file

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How It Works

Each account is stored as a struct containing the account number, holder name, current balance, and a rolling buffer of the last 10 transactions. All accounts are written to accounts.dat as raw binary records. On every update, the file is rewritten with the modified record in place — similar to how a simple flat-file database works.

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Author

Lucifuge — BCA Student, United Institute of Management, Prayagraj
GitHub: @anshman-git

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Built during the CodeAlpha C Programming Internship