From 8ceb2551819be0aaa7bb5ae11737639443b1533b Mon Sep 17 00:00:00 2001
From: Kirill <44455851+Rambo232@users.noreply.github.com>
Date: Tue, 11 Dec 2018 21:51:14 +0300
Subject: [PATCH 1/2] Stage 4

---
 src/repl/Main.java | 57 ++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/src/repl/Main.java b/src/repl/Main.java
index 625a751..0c1cf29 100644
--- a/src/repl/Main.java
+++ b/src/repl/Main.java
@@ -1,7 +1,60 @@
 package repl;
 
+import java.util.Scanner;
+
 public class Main {
     public static void main(String[] args) {
-        System.out.print("Hello world!");
+        Scanner scanner = new Scanner(System.in);
+        int result = 0;
+        int sub = 0;
+        boolean yes = true;
+        while (yes) {
+            String operation = scanner.nextLine();
+            while (yes) {
+                while (operation.equals("/help")) {
+                    System.out.println("This code is work!");
+                    operation = scanner.nextLine();
+                }
+                while (operation.equals("/exit")) {
+                    System.out.println("Hasta la vista!");
+                    yes = false;
+                    break;
+                }
+                while (operation.matches("\\S*")&&!operation.matches("\\d*")&&yes) {
+                    System.out.println("Invalid sequence of symbols to calculate!");
+                    operation = scanner.nextLine();
+                }
+                if (operation.matches("[^A-Za-z]*")) {
+                    break;
+                }
+            }
+            while (yes) {
+                String[] arr = operation.split("\\s+");
+                String mOperation = "";
+                for (int i = 0; i < arr.length; i++) {
+                    if (arr[i].matches("\\++")) {
+                        mOperation += " ";
+                    } else if (arr[i].matches("\\-")&&!arr[i+1].matches("\\-")) {
+                        arr[i + 1] = '-' + arr[i + 1];
+                        arr[i] = " ";
+                        mOperation += " ";
+                    }else if (arr[i].matches("\\-{2}|\\-{4}|\\-{6}|\\-{8}")){
+                        mOperation+= " ";
+                    }else if (arr[i].matches("\\-{3}|\\-{5}|\\-{7}|\\-{9}")){
+                        arr[i + 1] = '-' + arr[i + 1];
+                        arr[i] = " ";
+                        mOperation += " ";
+                    }
+                    else mOperation += arr[i];
+                }
+                String[] arr2 = mOperation.split("\\s+");
+                for (String ch : arr2) {
+                    result += Integer.parseInt(ch);
+                }
+                System.out.println(result);
+                result = 0;
+                break;
+            }
+        }
     }
-}
\ No newline at end of file
+}

From f490c86018d866bee5e3ff268f9ac757c0474000 Mon Sep 17 00:00:00 2001
From: Kirill <44455851+Rambo232@users.noreply.github.com>
Date: Thu, 20 Dec 2018 17:41:44 +0300
Subject: [PATCH 2/2] Stage 5

---
 src/repl/Main.java | 90 ++++++++++++++++++++++------------------------
 1 file changed, 42 insertions(+), 48 deletions(-)

diff --git a/src/repl/Main.java b/src/repl/Main.java
index 0c1cf29..3333267 100644
--- a/src/repl/Main.java
+++ b/src/repl/Main.java
@@ -2,59 +2,53 @@
 
 import java.util.Scanner;
 
-public class Main {
+public class aMain {
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
-        int result = 0;
-        int sub = 0;
         boolean yes = true;
-        while (yes) {
+        do {
+           int result = 0;
             String operation = scanner.nextLine();
-            while (yes) {
-                while (operation.equals("/help")) {
-                    System.out.println("This code is work!");
-                    operation = scanner.nextLine();
-                }
-                while (operation.equals("/exit")) {
-                    System.out.println("Hasta la vista!");
-                    yes = false;
-                    break;
-                }
-                while (operation.matches("\\S*")&&!operation.matches("\\d*")&&yes) {
-                    System.out.println("Invalid sequence of symbols to calculate!");
-                    operation = scanner.nextLine();
-                }
-                if (operation.matches("[^A-Za-z]*")) {
-                    break;
-                }
-            }
-            while (yes) {
-                String[] arr = operation.split("\\s+");
-                String mOperation = "";
-                for (int i = 0; i < arr.length; i++) {
-                    if (arr[i].matches("\\++")) {
-                        mOperation += " ";
-                    } else if (arr[i].matches("\\-")&&!arr[i+1].matches("\\-")) {
-                        arr[i + 1] = '-' + arr[i + 1];
-                        arr[i] = " ";
-                        mOperation += " ";
-                    }else if (arr[i].matches("\\-{2}|\\-{4}|\\-{6}|\\-{8}")){
-                        mOperation+= " ";
-                    }else if (arr[i].matches("\\-{3}|\\-{5}|\\-{7}|\\-{9}")){
-                        arr[i + 1] = '-' + arr[i + 1];
-                        arr[i] = " ";
-                        mOperation += " ";
-                    }
-                    else mOperation += arr[i];
-                }
-                String[] arr2 = mOperation.split("\\s+");
-                for (String ch : arr2) {
-                    result += Integer.parseInt(ch);
-                }
-                System.out.println(result);
-                result = 0;
+            if (operation.equals("/exit")) {
+                System.out.println("Bye!");
                 break;
+            } else if (operation.equals("/help")) {
+                System.out.println("This program calculate numbers ");
+                continue;
+            } else if (operation.matches("/.+")) {
+                System.out.println("Unknown command");
+                continue;
+            } else if (operation.matches("[a-zA-Z]+")) {
+                System.out.println("Invalid expression");
+                continue;
+            }else if (operation.matches("\\d+[-+]")){
+                System.out.println("Invalid expression");
+                continue;
+            }else if (operation.matches("\\d+\\s+\\d+")){
+                System.out.println("Invalid expression");
+                continue;
+            }
+            System.out.println(calculate(operation));
+            }
+            while (yes) ;
+        }
+        public static int calculate(String operation){
+        int result = 0;
+            String[] arr = operation.split("\\s+");
+            String mOperation = "";
+            for (int i = 0; i < arr.length; i++) {
+                if (arr[i].matches("\\+")) {
+                    mOperation += " ";
+                } else if (arr[i].matches("\\-")) {
+                    arr[i + 1] = '-' + arr[i + 1];
+                    arr[i] = " ";
+                    mOperation += " ";
+                } else mOperation += arr[i];
+            }
+            String[] arr2 = mOperation.split("\\s+");
+            for (String ch : arr2) {
+                result += Integer.parseInt(ch);
             }
+            return result;
         }
     }
-}