Additional prompt details

• display() – to display the entire content
• display(n, m) – to display from line n to m
• insert(n, text) – to insert text at line n
• delete(n) – delete line n
• delete(n, m) – delete from line n to m
• copy(n, m) – copy contents from line n to m to clipboard
• paste(n) – paste contents from clipboard to line n
• undo() – undo last command
• redo() – redo last command

expected the textpad to be in memory(not as file) and also expected to handle error gracefully and the program to be menu driven.

Functional requirements (FR)

• Identify the primary actors and support their core create, read, update, and lifecycle actions.
• Enforce the domain rules and constraints stated in the original prompt.
• Provide appropriate search, status, history, or reporting capabilities for the use case.
• Give operators a way to inspect failures and safely perform permitted administrative actions.

Non-functional requirements (NFR)

• Define availability, latency, throughput, and growth targets from the intended workload.
• Preserve data correctness during concurrent operations, retries, and dependency failures.
• Protect user and business data with authentication, authorization, and auditable access.
• Plan for observability, recovery, deployment safety, and cost as usage grows.

Principal-level discussion

• Define the scale, success measures, and operational ownership before committing to an architecture.
• Compare at least two viable approaches and explain the trade-offs, migration path, and failure behavior.
• Identify the riskiest assumptions and how you would validate them with data or a staged rollout.