Learn Lua Step-by-Step: GST & Discount Calculator Example

Published on: 10 Feb 2026Category: Lua Programming / Beginner Tutorial

Introduction

Lua ek lightweight aur beginner-friendly scripting language hai jo gaming, automation, aur mini projects ke liye perfect hai.

Is blog mein hum ek GST + Discount Calculator banayenge, step-by-step, jise aap easily samajh sakte ho aur apne projects me use kar sakte ho.

Step 1: Setting Up Lua

Aap Lua ka code online compiler me run kar sakte ho ya apne PC me Lua install karke practice kar sakte ho.

Test ke liye simple program:

print("Hello, Lua!")

Output:

Hello, Lua!

✅ Agar ye output aa gaya, to Lua setup sahi hai.

Step 2: Basic Price and GST Calculation

Ab hum ek product ka price aur GST calculate karenge.

price = 2045
gst = 0.12

gst_amount = price * gst
net_price = price + gst_amount

print(string.format("Net Price: %.2f", net_price))

Output:

Net Price: 2290.40

💡 Tip: string.format("%.2f") ka use professional bills me hota hai, taki 2 decimal digits dikhaye jaaye.

Step 3: Adding Discount Logic

Agar net price 2000 se zyada ho, to 10% discount apply karenge:

if net_price > 2000 then
    discount = net_price * 0.10
    final_price = net_price - discount
    print(string.format("Discounted Price: %.2f", final_price))
else
    final_price = net_price
    print("No discount!")
end

Output:

Discounted Price: 2061.36

Step 4: Bonus Tips for Beginners

• Hamesha consistent variable names use karo, jaise net_price aur discount.

• Lua keywords lowercase me hi likho: if, then, else, end.

• Professional output ke liye hamesha string.format("%.2f") ka use karo.

• Code clean aur readable rakho, especially jab blog ya website me post kar rahe ho.

Step 5: Next Steps

Ab aap ye calculator extend kar sakte ho:

• Multiple items ke liye table use karo

• Loop chala ke total calculate karo

• Har item ka GST aur discount apply karo

• Final report generate karo

Is tarah ka project Tally automation ya gaming inventory management ke liye bhi useful hai.

Lua script calculating GST and discount for a product price, with conditional logic applied based on price thresholds.

Conclusion

• Lua beginners ke liye simple aur fun language hai.

• GST + Discount Calculator ek real-world example hai jo aapko coding aur logic dono sikhaata hai.

• Next step: Tables, Loops, Multiple Items, File I/O.

💡 Pro Tip: Blog ke liye code aur output clearly dikhaye, aur readers ke liye step-by-step headings rakho.

Agar chaho to main Phase 2 blog bhi bana doon jisme:

• Multiple items in a table

• GST + Discount per item

• Final professional bill output