**Introduction:** Euler’s Number , also known as Euler’s Constant and denoted by ‘e’ is a constant value as well as an irrational number . Its approximate value is 2.718281828459045, or 2.71828 in short for quick calculation . Most modern programming languages include this value in their Math libraries, for example: C++’s exp() or Dart’s e displays the Euler’s Constant .

**We shall write a Dart (Flutter) program to calculate the Euler’s Number, ‘e’ :**

import ‘dart:math’;

// class to work with Euler’s value

class CalculateEuler{

// method to calculate ‘e’

void calculateEuler(){

// taking a specific constant named special_constant to calculate ‘e’

int special_constant = 99999991726;

// calculating ‘e’ without Math library’s assistance

num calculated_euler = pow((1 + (1/special_constant)),special_constant);

// displaying the calculated (approximate) ‘e’

print(“My Calculation: ” + calculated_euler.toString());

}

}

void main() {

// taking an instance of CalculateEuler class

CalculateEuler euler = CalculateEuler();

// calling the method on the instance

euler.calculateEuler();

// displaying the original value of ‘e’ from Dart’s Math library

print(“Actual e: ” + e.toString());

// print(exp(1)) displays the same value of ‘e’

}

The calculated value in this Dart (Flutter) program results in 2.7182818284464436 that is close to the actual value of ‘e’ (i.e. 2.718281828459045) that is showed as well .

**Applications of Euler’s Number:**

‘e’ is found to be used far and wide, including but not limited to:

1. Probability

2. Radioactivity

3. Pharmaceuticals

4. Bernoulli Trials

5. Standard Normal Distribution

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