From ccbf49fdcda94cd17a0d2b1196fbfa8df976a538 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=92=D0=B0=D0=BB=D0=B5=D1=80=D0=B8=D1=8F=20=D0=92=D0=BE?=
 =?UTF-8?q?=D1=80=D0=BE=D0=BD=D1=86=D0=BE=D0=B2=D0=B0?=
 <leraq8630@gmail.com>
Date: Mon, 10 Nov 2025 09:26:34 +0500
Subject: [PATCH] =?UTF-8?q?=D0=92=D0=BE=D1=80=D0=BE=D0=BD=D1=86=D0=BE?=
 =?UTF-8?q?=D0=B2=D0=B0=20=D0=92=D0=B0=D0=BB=D0=B5=D1=80=D0=B8=D1=8F.=20?=
 =?UTF-8?q?=D0=9F=D1=80=D0=98-201.=20=D0=9C=D0=BE=D0=B4=D1=83=D0=BB=D1=8C?=
 =?UTF-8?q?=207?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 task01/src/com/example/task01/Task01Main.java | 15 ++++++++++--
 task02/src/com/example/task02/Task02Main.java | 21 ++++++++++++++++
 task03/src/com/example/task03/Task03Main.java | 24 +++++++++++++------
 task04/src/com/example/task04/Task04Main.java | 15 +++++++++++-
 4 files changed, 65 insertions(+), 10 deletions(-)

diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java
index 7efef9a8..bf3a9542 100644
--- a/task01/src/com/example/task01/Task01Main.java
+++ b/task01/src/com/example/task01/Task01Main.java
@@ -15,7 +15,18 @@ public static void main(String[] args) throws IOException {
     }
 
     public static int checkSumOfStream(InputStream inputStream) throws IOException {
-        // your implementation here
-        return 0;
+
+        if (inputStream == null){
+            throw new IllegalArgumentException();
+        }
+        int checksum = 0;
+        int currentByte;
+
+        while ((currentByte = inputStream.read()) != -1) {
+            // C[n+1] = rotateLeft(C[n]) xor b[n+1]
+            checksum = Integer.rotateLeft(checksum, 1) ^ currentByte;
+        }
+
+        return checksum;
     }
 }
diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java
index 865ea659..67bb3401 100644
--- a/task02/src/com/example/task02/Task02Main.java
+++ b/task02/src/com/example/task02/Task02Main.java
@@ -9,5 +9,26 @@ public static void main(String[] args) throws IOException {
         // - направить стандартный вывод программы в файл output.test
         // - запустить программу
         // - и сравнить получившийся файл output.test с expected.test
+
+        int prevByte = -1;
+        int currentByte;
+
+        while ((currentByte = System.in.read()) != -1) {
+            if (prevByte == 13 && currentByte == 10) {
+                System.out.write(10);
+                prevByte = -1;
+            } else {
+                if (prevByte != -1) {
+                    System.out.write(prevByte);
+                }
+                prevByte = currentByte;
+            }
+        }
+
+        if (prevByte != -1) {
+            System.out.write(prevByte);
+        }
+
+        System.out.flush();
     }
 }
diff --git a/task03/src/com/example/task03/Task03Main.java b/task03/src/com/example/task03/Task03Main.java
index 332e0366..0d7e92cc 100644
--- a/task03/src/com/example/task03/Task03Main.java
+++ b/task03/src/com/example/task03/Task03Main.java
@@ -1,7 +1,6 @@
 package com.example.task03;
 
-import java.io.IOException;
-import java.io.InputStream;
+import java.io.*;
 import java.nio.charset.Charset;
 
 public class Task03Main {
@@ -9,13 +8,24 @@ public static void main(String[] args) throws IOException {
         //здесь вы можете вручную протестировать ваше решение, вызывая реализуемый метод и смотря результат
         // например вот так:
 
-        /*
-        System.out.println(readAsString(new FileInputStream("task03/src/com/example/task03/input.test"), Charset.forName("KOI8-R")));
-        */
+
+        System.out.println(readAsString(new FileInputStream("task03/src/com/example/task03/input.test"),
+                Charset.forName("KOI8-R")));
+
     }
 
     public static String readAsString(InputStream inputStream, Charset charset) throws IOException {
-        // your implementation here
-        return "";
+        if (inputStream == null || charset == null){
+            throw new IllegalArgumentException();
+        }
+
+        InputStreamReader reader = new InputStreamReader(inputStream, charset);
+        BufferedReader bufferedReader = new BufferedReader(reader);
+        StringBuilder result = new StringBuilder();
+        String line;
+        while ((line = bufferedReader.readLine()) != null) {
+            result.append(line);
+        }
+        return result.toString();
     }
 }
diff --git a/task04/src/com/example/task04/Task04Main.java b/task04/src/com/example/task04/Task04Main.java
index 4236c2e7..8f1a15b1 100644
--- a/task04/src/com/example/task04/Task04Main.java
+++ b/task04/src/com/example/task04/Task04Main.java
@@ -1,6 +1,8 @@
 package com.example.task04;
 
 import java.io.IOException;
+import java.util.Locale;
+import java.util.Scanner;
 
 public class Task04Main {
     public static void main(String[] args) throws IOException {
@@ -9,6 +11,17 @@ public static void main(String[] args) throws IOException {
         // - запустить программу
         // - проверить, что получилось 351.731900
 
-        System.out.println("0.0");
+        Scanner scanner = new Scanner(System.in);
+        double sum = 0.0;
+        while (scanner.hasNext()) {
+            String token = scanner.next();
+            try {
+                double number = Double.parseDouble(token);
+                sum += number;
+            } catch (NumberFormatException e) {
+
+            }
+        }
+        System.out.printf(Locale.US,"%.6f", sum);
     }
 }