Project · C# and .NET

Project: a kirana shop GST bill

Projectbeginner· about 4 hours· 6 steps

The brief

Build the billing program for Shree Ganesh Kirana in Indore: items in arrays, GST by slab with a switch expression, a neatly aligned bill, round-off to the nearest rupee, and change for the cash the customer hands over.

Why it matters

Billing software is one of the first things small businesses buy, and every billing screen does these exact steps: line totals, GST per slab, round-off and change. Junior developers at billing and POS (point-of-sale) companies work on this logic, where one wrong rounding rule means hundreds of wrong bills a day.

Skills you practise

dotnet new and dotnet build
parallel arrays and for loops
switch expressions
Math.Round and MidpointRounding
StringBuilder and alignment
decimal.TryParse in a loop

You need

.NET 8 SDK or newer
A terminal and a code editor (VS Code with the C# Dev Kit, Visual Studio or Rider)

What you will have at the end

The KiranaBill console project: an aligned GST bill for five items, GST by slab, round-off to the rupee and change, with input checks. Add a screenshot of a run to your portfolio.

How it is marked (rubric, 100 points)

Correct moneyEvery check passes: subtotal 1143.00, GST 73.50, payable 1217.00, change 783.00.	40
Robust inputWords and short amounts are refused politely and asked again; nothing crashes.	20
Code structureGstRate and BuildBill are separate methods that return values; no rate is typed twice.	25
PresentationThe columns line up and every rupee amount has two decimals.	15

0/6 steps done

Step 1 of 6

Create the project and build it

A console project named KiranaBill exists, holds this project's Program.cs, and builds with no errors.

dotnet new console -n KiranaBill makes the project in a new KiranaBill folder (-n names the project and the folder). Replace its Program.cs with this project's starter. dotnet build only compiles: it is the quickest way to see errors (they look like Program.cs(12,5): error CS1002: ; expected) without running anything. Fix every error before you go on.

dotnet new console -n KiranaBill
cd KiranaBill
dotnet build

Run this on your machine, then paste the output below

$ dotnet new console -n KiranaBill
cd KiranaBill
(copy this project's Program.cs into the folder)
dotnet build

Your notes: Program.cs

Write down each command you ran. It goes into your project summary.