Class CalculatorCli

Namespace

CalculatorLibrary

Assembly

CalculatorLibrary.dll

Parses and runs the calculator's command-line arguments.

public static class CalculatorCli

Inheritance

object

CalculatorCli

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

The parsing logic lives here, in the library, instead of in CalculatorApp/Program.cs, so it can be unit tested directly (see CalculatorLibrary.Tests/CalculatorCliTests.cs) without spawning the console application as a process. Program.cs only calls Run(string[]) or RunDemo() and prints the result — it never reads from the console, so it never blocks when the app is launched from a script, a build pipeline or CI.

When you rename this sample into your own project, replace this class with your own argument-parsing entry point, keeping the same "parsing is a library function, not something the console shell does inline" shape.

Fields

UsageText

The usage line shown when the arguments cannot be parsed.

public const string UsageText = "Usage: CalculatorApp <add|subtract|multiply|divide> <a> <b>"

Field Value

string

Methods

Run(string[])

Parses args as <operation> <a> <b> and returns a line of text describing the result.

public static string Run(string[] args)

Parameters

args string[]

Exactly three arguments: the operation name (add, subtract, multiply or divide, case-insensitive) followed by the two integer operands.

Returns

string

A human-readable line such as "2 add 2 = 4".

Exceptions

ArgumentException

Thrown when the argument count is wrong, an operand is not a valid 32-bit integer, or the operation name is not recognized. The message always ends with UsageText.

DivideByZeroException

Thrown when dividing by zero.

RunDemo()

Runs a small built-in demonstration that exercises every operation once, used when the application is started with no arguments at all (so a first run always shows something, without waiting on keyboard input).

public static string RunDemo()

Returns

string

The combined demo output, ending with UsageText.