Pharmacy Invoice Program

This repository contains a C program for generating a pharmacy invoice based on a selected medicine and purchased quantity.

Files

• pharn.c - Main source file implementing input validation, medicine selection, calculation logic, and formatted invoice output.
• .gitignore - Ignores generated directories and editor settings.

Usage

1. Compile with your C compiler, for example:

   gcc pharn.c -o pharn.exe

2. Run the program and follow the prompts.

Notes

• Quantity must be greater than 0, otherwise the program prints Invalid quantity.
• Discounts apply only when quantity is greater than 100.
• Output formatting uses exactly two decimal places as required.