Sure! Here's a detailed README.md file tailored for your uploaded C programs that implement:

• LL(1) Parser
• First and Follow computation
• Operator Precedence Parser
• Leading and Trailing computation

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📘 README.md

# 🔍 Parser Implementations in C

This repository contains C programs to implement various parsing techniques used in Compiler Design:

- ✅ LL(1) Parser
- ✅ FIRST and FOLLOW set computation
- ✅ Operator Precedence Parser
- ✅ LEADING and TRAILING set computation

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## 📁 Files Included

| File                         | Description |
|------------------------------|-------------|
| `ll1_parser.c`               | Implements an LL(1) parser using predictive parsing table |
| `first_follow.c`            | Calculates the FIRST and FOLLOW sets of a given grammar |
| `operator_precedence.c`     | Parses expressions using operator precedence relations |
| `leading_trailing.c`        | Computes the LEADING and TRAILING sets for operator precedence grammars |

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## ⚙️ How to Compile and Run

### Step 1: Compile

Use `gcc` to compile any of the source files. Example:

```bash
gcc ll1_parser.c -o ll1_parser

Step 2: Run

Execute the compiled file:

./ll1_parser

Repeat the steps for each individual file.

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🧠 Concepts Covered

1. LL(1) Parser

• Uses a predictive parsing table
• Requires FIRST and FOLLOW sets
• Input is parsed using a stack and table lookup

2. FIRST and FOLLOW Sets

• FIRST: set of terminals that begin strings derivable from a non-terminal
• FOLLOW: set of terminals that can appear immediately to the right of a non-terminal in some sentential form

3. Operator Precedence Parsing

• Handles expressions like i+i*i
• Uses precedence relations (<, >, =) to decide when to shift or reduce
• Employs a precedence table for terminals

4. LEADING and TRAILING Sets

• Used in construction of operator precedence grammar
• LEADING: terminals that appear at the start of strings derived from a non-terminal
• TRAILING: terminals that appear at the end

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📌 Notes

• Expressions use i as a placeholder for identifiers
• Terminals such as +, *, (, ) are used in operator precedence
• Ensure grammars are suitable (non-left-recursive for LL(1), operator precedence for others)

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🧪 Example Inputs

• LL(1): Grammar rules and a string to test
• FIRST/FOLLOW: Grammar in production form
• Operator Precedence: Expression like i+i*i
• LEADING/TRAILING: Grammar for precedence relation setup

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👨‍💻 Author

Anuj Gupta
B.Tech CSE (Full Stack AI), UPES

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📝 License

This project is open-source and free to use for educational purposes.

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Let me know if you want me to auto-generate a table of contents, add code samples, or convert this into a formatted `README.md` file you can directly push to GitHub.