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There are three main patterns we are going to use

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There are three main patterns we are going to use; Factory method, Command Object pattern, and Fluent API (which could be called Chain of Responsibility, but it's a bit of stretch in this case) to build our calculator. We want to end up with a calculator that can be called like this:

var cmd = CalculationCommandFactor

var calc = new Fluent Calculator(); var result1= calc. Calculate (cmd).GetRe: var result2 = calc. Calculate (cmd). Calcu var result3 = calc. Calculate (cmd). Calcu

Console.WriteLine(result1 == 10); // tri Console.WriteLine(result2 == 30); // tri Console.WriteLine(result == 20); // tri

• Build a calculator class

Fluent Calculator that supports the fluent interface shown above

• Ensure that you can pass a command object into the

Calculate method

• Have a GetResult() method that

 

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