Added first version of test 2.1

sem1/test2/test2.1.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+using namespace std;
+
+int countFibonacciNum(int index);
+
+int main()
+{
+    cout << "Enter index of Fibonacci number\n";
+    int index = 0;
+    cin >> index;
+
+    cout << "The " << index << "th Fibonacci number is ";
+    cout << countFibonacciNum(index);
+}
+
+int countFibonacciNum(int index)
+{
+    if (index > 2)
+    {
+        int fibonacciNumber = 0;
+        int last = 1;
+        int penult = 1;
+        for (int i = 2; i < index; i++)
+        {
+            fibonacciNumber = penult + last;
+            penult = last;
+            last = fibonacciNumber;
+        }
+        return fibonacciNumber;
+    }
+    return 1;
+}