task_1

lr9/task_1/e1.java

@@ -0,0 +1,14 @@
+import java.util.Scanner;
+
+class Main {
+    public static void m(int x){
+        System.out.println("x = " + x);
+        if ((2 * x + 1) < 20){
+            m(2 * x + 1);
+        }
+    }
+
+    public static void main(String[] args) {
+        m(1);
+    }
+}

lr9/task_1/e2.java

@@ -0,0 +1,14 @@
+import java.util.Scanner;
+
+class Main {
+    public static void m(int x){
+        if ((2 * x + 1) < 20){
+            m(2 * x + 1);
+        }
+        System.out.println("x = " + x);
+    }
+
+    public static void main(String[] args) {
+        m(1);
+    }
+}

lr9/task_1/e3.java

@@ -0,0 +1,25 @@
+import java.util.Scanner;
+
+class Main {
+    private static int step = 0;
+    public static void m(int x){
+        space();
+        System.out.println("" + x + "-> ");
+        step++;
+        if ((2 * x + 1) < 20){
+            m(2 * x + 1);
+        }
+        step--;
+        space();
+        System.out.println("" + x + " <-");
+    }
+    public static void space(){
+        for (int i = 0; i < step; i++){
+            System.out.println(" ");
+        }
+    }
+
+    public static void main(String[] args) {
+        m(1);
+    }
+}

lr9/task_1/e4.java

@@ -0,0 +1,15 @@
+import java.util.Scanner;
+
+class Main {
+    public static void main(String[] args) {
+        System.out.println(fact(5));
+    }
+    public static int fact(int n){
+        int res;
+        if (n == 1) return 1;
+        else{
+            res = fact(n - 1) * n;
+            return res;
+        }
+    }
+}

lr9/task_1/e5.java

@@ -0,0 +1,32 @@
+import java.util.Scanner;
+
+class Main {
+    public static void main(String[] args) {
+        int result = fact(5);
+        System.out.println("Результат: " + result);
+    }
+
+    public static int fact(int n) {
+
+        System.out.println("Вход в fact(" + n + ")");
+
+        if (n == 0) {
+            System.out.println("fact(0) -> 0");
+            return 0;
+        } 
+        else if (n == 1) {
+            System.out.println("fact(1) -> 1");
+            return 1;
+        } 
+        else {
+            int a = fact(n - 2);
+            int b = fact(n - 1);
+
+            int result = a + b;
+
+            System.out.println("fact(" + n + ") = fact(" + (n-2) + ") + fact(" + (n-1) + ") = " + result);
+
+            return result;
+        }
+    }
+}