C# Program to Calculate the Value of e

The Program in C# Program to Calculate the Value of e is given below:

``````using System;

namespace EulerCalculation
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello Codeauri Family, enter the number of decimal places to calculate e to:");
double e = CalculateE(decimalPlaces);
Console.WriteLine("e: " + e.ToString("F" + decimalPlaces));
}

static double CalculateE(int decimalPlaces)
{
double e = 1;
double denominator = 1;
for (int i = 1; i < decimalPlaces; i++)
{
denominator *= i;
e += 1 / denominator;
}
return e;
}
}
}
``````

Output:

Hello Codeauri Family, enter the number of decimal places to calculate e to:9
e: 2.718278770

Pro-Tips💡

Here are the step by step execution of above program:

1. `using System;` – This line includes the `System` namespace, which provides access to the `Console` class used to interact with the console.
2. `namespace EulerCalculation` – This line declares the `EulerCalculation` namespace, which is used to organize code and prevent naming collisions.
3. `class Program` – This line declares the `Program` class, which contains the logic of the program.
4. `static void Main(string[] args)` – This line declares the `Main` method, which is the entry point of the program. It takes an array of strings as an argument and returns nothing (`void`).
5. `Console.WriteLine("Hello Codeauri Family, enter the number of decimal places to calculate e to:");` – This line writes a message to the console asking the user to enter the number of decimal places to calculate e to.
6. `int decimalPlaces = int.Parse(Console.ReadLine());` – This line reads a line of text from the console and converts it to an integer, which is stored in the `decimalPlaces` variable.
7. `double e = CalculateE(decimalPlaces);` – This line calls the `CalculateE` method, passing it the `decimalPlaces` variable, and stores the result in the `e` variable.
8. `Console.WriteLine("e: " + e.ToString("F" + decimalPlaces));` – This line writes the value of `e` to the console, formatted to the specified number of decimal places.
9. `static double CalculateE(int decimalPlaces)` – This line declares the `CalculateE` method, which takes an `int` argument and returns a `double`.
10. `double e = 1;` – This line initializes the `e` variable to 1.
11. `double denominator = 1;` – This line initializes the `denominator` variable to 1.
12. `for (int i = 1; i < decimalPlaces; i++)` – This line declares a `for` loop that will repeat `decimalPlaces - 1` times. The loop variable `i` is initialized to 1 and incremented on each iteration.
13. `denominator *= i;` – This line updates the value of `denominator` by multiplying it by `i`.
14. `e += 1 / denominator;` – This line updates the value of `e` by adding `1 / denominator` to it.
15. `return e;` – This line returns the value of `e` from the `CalculateE` method.

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