Exercises in .NET with Andras Nemes

How to pass any number of parameters into a method in C# .NET

You must have come across built-in methods in .NET where you can send any number of arguments into a method. E.g. string.Format has an overload where you can pass in a format string and then an array with the “params” modifier.

There’s nothing stopping you from using the same keyword to write a similar method, here’s an example:

public void MethodWithParams(int toBeMultiplied, params int[] multipliers)
{
	foreach (int m in multipliers)
	{ 
		Console.WriteLine(string.Format("{0} x {1} = {2}", toBeMultiplied, m, toBeMultiplied * m));
	}
}

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Compose extremely large integers using BigInteger in C# .NET

The largest integer that can be stored in a long, i.e. a 64-bit integer is 9,223,372,036,854,775,807 in .NET. That is a very large number that will be enough for most applications out there.

However, sometimes it’s not enough and you need to handle something larger. This article on Wikipedia shows several use cases where this can occur. .NET also provides the float and double numeric types that provide much larger ranges. They won’t be integers exactly but they may suit your needs anyhow.

The .NET framework has an object called BigInteger that lets you construct arbitrarily large integers. This object resides in the System.Numerics namespace so you’ll need to reference the System.Numerics.dll library.

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