How to type π in C#

Output π in C

#In C#, there are the following methods to output π:

1. Use the built-in Math.PI constant

The Math.PI constant stores the approximate value of π, which is approximately 3.141592653589793. To use it, just write this in your code:

Console.WriteLine(Math.PI);

2. Use Math.Atan2(1, 0)

Math.Atan2(y, x) The function returns the angle (in radians) formed by y and x. When y is 1 and x is 0, we get π/2. By multiplying the result by 2, we can get π:

Console.WriteLine(2 * Math.Atan2(1, 0));

3. Using a Loop Approximation

We can use a loop to approximate the value of π. The following code uses Machen's formula to calculate an approximation of π:

double pi = 0;
for (int i = 0; i < 100000; i++)
{
    pi += Math.Pow(-1, i) / (2 * i + 1);
}
Console.WriteLine(pi * 4);

4. Using the System.Numerics namespace

.NET 5 and above includes System. The Numerics namespace provides a BigInteger type specifically designed to represent numbers of arbitrary precision:

using System.Numerics;

BigInteger piApprox = BigInteger.Atan2(BigInteger.One, BigInteger.Zero) * 2;
Console.WriteLine(piApprox.ToString());

Which method you choose depends on the required precision and performance requirements. For most cases, using Math.PI constants is sufficient.

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