1. Fibonacci Series

int a = 0; int b = 1; int target = 55;
FibonacciSeries1(a, b, target);
static int FibonacciSeries1(int a, int b, int target)
{
    /*usign for loop*/
    int result = 0;
    for (int i = 0; i < target; i++)
    {
        result = a + b;
        Console.WriteLine(a + "+" + b + "=" + result);
        a = b;
        b = result;
        if(result == target)
        {
            return result;
        }
    }
    return result;

    /*usign recursion*/
    /*int result = a + b;
    Console.WriteLine(a + "+" + b + "=" + result);
    a = b;
    b = result;
    if (result == 55)
    {
        return result;
    }
    else
    {
        return FibonacciSeries1(a, b);
    }*/
}