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

alg_4_1.cpp

@@ -1,5 +1,4 @@
 #include <iostream>
-using namespace std;
 
 int gcd_recur(int n1, int n2)
 {
@@ -20,8 +19,11 @@ int gcd_recur(int n1, int n2)
 
 int main()
 {
+  setlocale(LC_ALL, "Russian");
 	int a, b;
-	cin >> a >> b;
 
-	cout << gcd_recur(a, b);
-}
+  std::cout << "Введите два числа для определения НОД: ";
+  std::cin >> a >> b;
+
+  std::cout << "НОД: " << gcd_recur(a, b) << std::endl;
+}