added ws202425 courses

2023_Informatik_b/2/fibonacci.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+
+// Fibonacci numbers
+
+int main() {
+
+    int x;
+    std::cout << "x-th Fibonacci number?: ";
+    std::cin >> x;
+
+    int prev = 0;
+    int curr = 1;
+    int tmp;
+
+    for (int i = 2; i <= x; ++i) {
+        tmp = curr;
+        curr = prev + curr;
+        prev = tmp;
+    }
+
+}