Fixed my old formatting and patched things that were left as-is due to burnout and laziness

alg_4_2.cpp

@@ -1,5 +1,4 @@
 #include <iostream>
-using namespace std;
 
 int fib(int n)
 {
@@ -11,7 +10,11 @@ int fib(int n)
 
 int main()
 {
-	int n; cin >> n;
+  setlocale(LC_ALL, "Russian");
+	int n;
 
-	cout << fib(n);
-}
+  std::cout << "Введите число n для определения числа Фибоначчи: ";
+  std::cin >> n;
+
+  std::cout << fib(n) << std::endl;
+}