🖥️ Introduction to Application Programming
💡 What is an Application?
- An application is a program that helps you do a task using technology.
- Examples:
- 🧮 Calculator – for math
- 🖼️ Photo Editor – for pictures
- 💬 Messaging App – for communication
- 🔑 Summary: It makes your work easier through digital tools.
🖥️ What is a Mainframe Application?
- Software that runs on Mainframe Computers – used by big organizations.
- Handles:
- Transaction processing (e.g., banking)
- Batch processing (e.g., payroll)
- Large-scale data management
- ERP systems
- Common programming languages:
- 🌍 Used in: Banking, Insurance, Retail, Government
🧠 Role of OS in Application Programming
- The Operating System (OS):
- Manages memory, CPU, and hardware.
- Provides APIs and system calls for application use.
- 🧩 Helps developers by handling complex tasks behind the scenes.
🔄 Mainframe Application Programming Lifecycle
- Requirement Gathering – Understand business needs.
- System Design – Choose architecture & tools.
- Modular Programming – Break logic into smaller pieces.
- Testing & Approval – Check for correctness.
- Deployment – Move to mainframe system.
- Maintenance – Monitor and update regularly.
⚙️ What are Executables?
- Executable = A file the computer can directly run.
- Created by:
- Source Code ➜ Compiler ➜ Executable
- 🧪 Example: Clicking Chrome runs its executable file.