Program to generate fibonacci series numbers in .NET

Introduction

Fibonacci numbers are the numbers in the following sequence of integers.

0, 0, 1, 2, 3, 5, 8, 13, 21, 34, 55….. ( Or )   1,1, 2, 3, 5, 8, 13, 21, 34, 55….

In definition of Fibonacci series the first two numbers are 0 and 1 and then each subsequent number is sum of previous two.So first two numbers we can assign as f0=0 and f1=1. Then f2 value is f0+f1.

F2= f0+f1, f3=f2+f1, f4=f3+f2…………fn=f (n-1) + f (n-2).

The result will be like 0, 0, 1, 2, 3, 5, 8, 13, 21, 34, 55….so on.

In the below program we will generate a sequence of Fibonacci number up to no of value entered.

Program:

class FibonacciSeries
    {
        public static int Fibonacci(int x)
        {
            //    F_n = F_{n-1} + F_{n-2} f2=f0+f1
            string tempString = string.Empty;
            tempString = "The Fibonacci Series for " + x.ToString() + " is:";
            var previousValue = -1;
            var currentResult = 1;
            for (var i = 0; i <= x; ++i)
            {
                var sum = currentResult + previousValue;
                previousValue = currentResult;
                currentResult = sum;
                tempString += sum + ",";
            }
            tempString = tempString.Remove(tempString.Length - 1); //to remove , at end of string
            Console.WriteLine(tempString);
            return currentResult;
        }
        public static void Main(string[] args)
        {
            Console.WriteLine("Enter No of digits in Fibonacci series=");
            int MaxSeriesVal = int.Parse(Console.ReadLine());
            Console.WriteLine("Fibonacci no. = {0}", Fibonacci(MaxSeriesVal));
            Console.ReadKey();
        }
    }

Output: