Security System in C++

A simple terminal-based Security System written in C++ that allows users to:

• Register (only if age ≥ 18)
• Login with credentials
• Change password
• Exit

User credentials (username, password, age) are stored in a local file (File.txt).

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Features

• Register with validation for minimum age (18+)
• Login with username, password, and age verification
• Secure password change functionality
• User data stored in file for persistence
• Password is masked when displayed (not shown in plain text)

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How to Run

1. Make sure you have a C++ compiler (e.g., g++) installed.
2. Compile and run the program:

g++ security_system.cpp -o security_system
./security_system

On windows

g++ security_system.cpp -o security_system.exe
security_system.exe