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3 years ago
788 B
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using System; namespace FibonacciSum { class Program { static long Fibonacci(long n) { if (n <= 1) { return n; } else { return Fibonacci(n - 1) + Fibonacci(n - 2); } } static void Main(string[] args) { long n = 10; // Calculate the 10th term in the Fibonacci sequence long y = 4000000000; // Sum up to 4,000,000,000 long fibonacci = Fibonacci(n); Console.WriteLine("The " + n + "th term in the Fibonacci sequence is " + fibonacci); long sum = Fibonacci(y / 3) * 2 + Fibonacci(y / 2); Console.WriteLine("Sum of all even numbers in the
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