Update Lab5.java

.gitignore

@@ -0,0 +1,2 @@
+# Project exclude paths
+/out/

Lab2/Program.cs

@@ -1,32 +0,0 @@
-using System;
-
-public class Laba2
-{
-    
-
-    public static void Main(string[] args)
-    {
-        const int a = 2;
-        int[][] b = new[]
-        {
-            new int[] { 1, 2, 8 },
-            new int[] { 3, 4, 5 },
-            new int[] { 6, 7, 9 }
-        };
-        calculation(b, a);
-    }
-
-    private static int[][] calculation(int[][] b, int a)
-    {
-        int[][]c = new int[b.Length][b[0].Length]; //недопустимий специфікатор рангу: вимагається "," або "]";
-        for (int i = 0; i < b.Length; i++)
-        {
-            c[i] = new int[b[i].Length];
-            for (int j = 0; j < b[i].Length; j++)
-            {
-                c[i][j] = b[i][j] * a;
-            }
-        }
-        return c;
-    }
-}

Lab4.java

@@ -0,0 +1,68 @@
+import java.util.Scanner;
+import java.util.Arrays;
+import java.util.Comparator;
+
+public class Lab4 {
+
+    public static void main(String[] args) {
+        Students student1 = new Students("Максим", 22, "ФІОТ", 91, 8);
+        Students students2 = new Students("Ольга", 19, "ФЕА", 34, 4);
+        Students students3 = new Students("Владислав", 18, "ФММ", 55, 10);
+        Students students4 = new Students("Марія", 20, "ХТФ", 11, 6);
+        Students students5 = new Students("Петро", 23, "ФМФ", 78, 2);
+        Students[] students = {student1, students2, students3, students4, students5};
+        System.out.println("Список студентів: ");
+        System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", "Ім'я", "Вік", "Факультет", "Номер групи", "Рівень знань(від 0 до 10)"));
+        for (Students student : students) {
+            System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", student.getName(), student.getAge(), student.getNameOfFaculty(), student.getNumberOfGroup(), student.getLvlOfKnowledge()));
+        }
+        Scanner scan = new Scanner(System.in);
+        System.out.println("Введіть за чим сортувати: ");
+        System.out.println("1 - Зростання \n2 - Спадання:");
+        int incOrDec = scan.nextInt();
+        System.out.println("Введіть за чим хочете сортувати: ");
+        System.out.println("1 - Ім'я \n2 - Вік \n3 - Факультет\n4 - Група\n5 - Рівень знань: ");
+        int num = scan.nextInt();
+        if (incOrDec == 1) {
+            switch (num) {
+                case 1:
+                    Arrays.sort(students, Comparator.comparing(Students::getName));
+                    break;
+                case 2:
+                    Arrays.sort(students, Comparator.comparingInt(Students::getAge));
+                    break;
+                case 3:
+                    Arrays.sort(students, Comparator.comparing(Students::getNameOfFaculty));
+                    break;
+                case 4:
+                    Arrays.sort(students, Comparator.comparingInt(Students::getNumberOfGroup));
+                    break;
+                case 5:
+                    Arrays.sort(students, Comparator.comparingInt(Students::getLvlOfKnowledge));
+                    break;
+            }
+        } else {
+            switch (num) {
+                case 1:
+                    Arrays.sort(students, Comparator.comparing(Students::getName).reversed());
+                    break;
+                case 2:
+                    Arrays.sort(students, Comparator.comparingInt(Students::getAge).reversed());
+                    break;
+                case 3:
+                    Arrays.sort(students, Comparator.comparing(Students::getNameOfFaculty).reversed());
+                    break;
+                case 4:
+                    Arrays.sort(students, Comparator.comparingInt(Students::getNumberOfGroup).reversed());
+                    break;
+                case 5:
+                    Arrays.sort(students, Comparator.comparingInt(Students::getLvlOfKnowledge).reversed());
+                    break;
+            }
+        }
+        System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", "Ім'я", "Вік", "Факультет", "Номер групи", "Рівень знань(від 0 до 10)"));
+        for (Students student : students) {
+            System.out.println(String.format("%-9s | %-3s | %-9s | %-11s | %s", student.getName(), student.getAge(), student.getNameOfFaculty(), student.getNumberOfGroup(), student.getLvlOfKnowledge()));
+        }
+    }
+}

Lab5.java

@@ -0,0 +1,107 @@
+public class Lab5 {
+    public static void main(String[] args) {
+        StringBuilder txt = new StringBuilder("соціальна мережа, яка є мережею мікроблогів. Дає змогу користувачам надсилати короткі текстові повідомлення (до 2802 символів, до 2017 року — до 140 символів), використовуючи SMS,");
+        System.out.println("Початковий текст:");
+        System.out.println(txt);
+        Text text = new Text(txt);
+        StringBuilder result = text.splitText();
+        System.out.println("Змінений текст:");
+        System.out.println(result);
+    }
+}
+
+class Text {
+    private final StringBuilder textString;
+    public Text(StringBuilder textString){
+        this.textString = textString;
+    }
+
+    public StringBuilder splitText() {
+        StringBuilder result = new StringBuilder();
+        String[] sentenceStrings = textString.toString().split("(?<=[?.!])\\s?");
+        for (String s : sentenceStrings) {
+            StringBuilder sb = new StringBuilder(s);
+            Sentence sentence = new Sentence(sb);
+            result.append(sentence.splitSentence());
+        }
+        return result;
+    }
+
+}
+
+class Sentence {
+    private final StringBuilder sentence;
+
+    public Sentence(StringBuilder sentence) {
+        this.sentence = sentence;
+
+    }
+
+    public StringBuilder splitSentence() {
+        StringBuilder returnSentence = new StringBuilder();
+        String text = sentence.toString();
+        String[] words = text.split(" ");
+        for (String w : words) {
+            StringBuilder wb = new StringBuilder(w);
+            Word word = new Word(wb);
+            returnSentence.append(word.splitWord()).append(" ");
+        }
+        return returnSentence;
+
+    }
+}
+
+class Word {
+    private final StringBuilder word;
+
+    public Word(StringBuilder word) {
+        this.word = word;
+    }
+
+    public StringBuilder splitWord() {
+        StringBuilder returnWord = new StringBuilder();
+        String wordstring = word.toString();
+        String[] letters = wordstring.split("");
+        String firstLetter = wordstring.substring(0, 1);
+        returnWord.append(firstLetter);
+        for (String l: letters){
+            StringBuilder lb = new StringBuilder(l);
+            Letter letter = new Letter(lb);
+            if (firstLetter.equals(letter.getLetter().toString())){
+                returnWord.append("");
+            }else{
+                if(l.equals("!") || l.equals("?") || l.equals(".") || l.equals(",") || l.equals(":") || l.equals(";")){
+                    Punctuation punctuation = new Punctuation(lb);
+                    returnWord.append(punctuation.getPunctuation());
+                }else{
+                    returnWord.append(letter.getLetter());
+                }
+            }
+        }
+        return returnWord;
+    }
+}
+
+class Letter {
+    private final StringBuilder letter;
+
+    public Letter(StringBuilder letter) {
+        this.letter = letter;
+    }
+
+    public StringBuilder getLetter() {
+        return letter;
+    }
+}
+
+class Punctuation {
+    private final StringBuilder punctuation;
+
+    public Punctuation(StringBuilder punctuation) {
+        this.punctuation = punctuation;
+    }
+
+    public StringBuilder getPunctuation() {
+        return punctuation;
+    }
+}

OOP_IO-2x_2023.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

Students.java

@@ -0,0 +1,30 @@
+public class Students {
+    private String name;
+    private int age;
+    private String nameOfFaculty;
+    private int numberOfGroup;
+    private int lvlOfKnowledge;
+
+    public Students(String name, int age, String nameOfFaculty, int numberOfGroup, int lvlOfKnowledge) {
+        this.name = name;
+        this.age = age;
+        this.nameOfFaculty = nameOfFaculty;
+        this.numberOfGroup = numberOfGroup;
+        this.lvlOfKnowledge = lvlOfKnowledge;
+    }
+    public String getName() {
+        return name;
+    }
+    public int getAge() {
+        return age;
+    }
+    public String getNameOfFaculty() {
+        return nameOfFaculty;
+    }
+    public int getNumberOfGroup() {
+        return numberOfGroup;
+    }
+    public int getLvlOfKnowledge() {
+        return lvlOfKnowledge;
+    }
+}

lab1.java

@@ -0,0 +1,29 @@
+import java.util.Scanner;
+
+public class lab1 {
+    public static void main(String[] args) {
+        float S = 0, i, j;
+        int C = 1;
+        Scanner scan = new Scanner(System.in);
+        System.out.println("Введіть значення a (a>1):");
+        int a = scan.nextInt();
+        System.out.println("Введіть значення b:");
+        int b = scan.nextInt();
+        System.out.println("Введіть значення n:");
+        int n = scan.nextInt();
+        System.out.println("Введіть значення m:");
+        int m = scan.nextInt();
+        for (i = a; i <= n; i++) {
+            if (i - C == 0) {
+                System.out.println("Ділення на 0");
+                return;
+            }
+            for (j = b; j <= m; j++) {
+                S += (i - j) / (i - C);
+
+            }
+        }
+        System.out.println(S);
+
+    }
+}

lab1_with_extracted_method/Program.cs

@@ -1,61 +0,0 @@
-using System;
-
-public class Lab1
-{
-    public static void Main(String[] args)
-    {
-        /*o1 = +
-         c3 = 0
-         o2 = *
-         c7 = short */
-
-        // var A = 4;
-        // short B = 3;
-        // var N = 10;
-        // var M = 10;
-        //
-        // var C = 1;
-        // var s = 0;
-        //
-        // bool divisionByZero=false;
-
-
-        Calculation(4, 3, 10, 10, 1, false);
-    }
-
-    public static void Calculation(int A, int C, int N, short B, int M, bool divisionByZero)
-    {
-        var s = 0;
-        if ((A <= -C && -C <= N) || (B <= 0 && 0 <= M))
-        {
-            Console.WriteLine("Division by zero!");
-            return;
-        }
-
-        for (int i = A; i <= N; i++)
-        {
-            if (i + C == 0)
-            {
-                Console.WriteLine("Division by zero!");
-                divisionByZero = true;
-                break;
-            }
-
-            for (short j = B; j <= M; j++)
-            {
-                if (j == 0)
-                {
-                    Console.WriteLine("Оскільки j = 0, то сума просто буде 0");
-                    break;
-                }
-
-                s += (i * j) / (i + C);
-            }
-        }
-
-        if (!divisionByZero)
-        {
-            Console.WriteLine($"s = {s};");
-        }
-    }
-}

lab1_with_extracted_method/lab1_with_extracted_method.csproj

@@ -1,10 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-  </PropertyGroup>
-
-</Project>

lab1_with_extracted_method/lab1_with_extracted_method.sln

@@ -1,25 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.3.32901.215
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "lab1_with_extracted_method", "lab1_with_extracted_method.csproj", "{24A496CD-EC4E-4EBB-AD75-5C0C0EFDC4D8}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{24A496CD-EC4E-4EBB-AD75-5C0C0EFDC4D8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{24A496CD-EC4E-4EBB-AD75-5C0C0EFDC4D8}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{24A496CD-EC4E-4EBB-AD75-5C0C0EFDC4D8}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{24A496CD-EC4E-4EBB-AD75-5C0C0EFDC4D8}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {BB8782D1-9F42-4685-8447-6B8E6181678C}
-	EndGlobalSection
-EndGlobal

lab1_with_extracted_method/obj/Debug/net6.0/.NETCoreApp,Version=v6.0.AssemblyAttributes.cs

@@ -1,4 +0,0 @@
-// <autogenerated />
-using System;
-using System.Reflection;
-[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v6.0", FrameworkDisplayName = "")]

lab1_with_extracted_method/obj/Debug/net6.0/lab1_with_extracted_method.AssemblyInfo.cs

@@ -1,23 +0,0 @@
-//------------------------------------------------------------------------------
-// <auto-generated>
-//     Этот код создан программой.
-//     Исполняемая версия:4.0.30319.42000
-//
-//     Изменения в этом файле могут привести к неправильной работе и будут потеряны в случае
-//     повторной генерации кода.
-// </auto-generated>
-//------------------------------------------------------------------------------
-
-using System;
-using System.Reflection;
-
-[assembly: System.Reflection.AssemblyCompanyAttribute("lab1_with_extracted_method")]
-[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
-[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
-[assembly: System.Reflection.AssemblyProductAttribute("lab1_with_extracted_method")]
-[assembly: System.Reflection.AssemblyTitleAttribute("lab1_with_extracted_method")]
-[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
-
-// Создано классом WriteCodeFragment MSBuild.
-

lab1_with_extracted_method/obj/Debug/net6.0/lab1_with_extracted_method.AssemblyInfoInputs.cache

@@ -1 +0,0 @@
-b0d331248e7cf508f22410bff3fa4c5190b3e6ab

lab1_with_extracted_method/obj/Debug/net6.0/lab1_with_extracted_method.GeneratedMSBuildEditorConfig.editorconfig

@@ -1,10 +0,0 @@
-is_global = true
-build_property.TargetFramework = net6.0
-build_property.TargetPlatformMinVersion = 
-build_property.UsingMicrosoftNETSdkWeb = 
-build_property.ProjectTypeGuids = 
-build_property.InvariantGlobalization = 
-build_property.PlatformNeutralAssembly = 
-build_property._SupportedPlatformList = Linux,macOS,Windows
-build_property.RootNamespace = lab1_with_extracted_method
-build_property.ProjectDir = C:\Users\user\source\repos\OOP_IO-2x_2023\lab1_with_extracted_method\

lab1_with_extracted_method/obj/Debug/net6.0/lab1_with_extracted_method.GlobalUsings.g.cs

@@ -1,8 +0,0 @@
-// <auto-generated/>
-global using global::System;
-global using global::System.Collections.Generic;
-global using global::System.IO;
-global using global::System.Linq;
-global using global::System.Net.Http;
-global using global::System.Threading;
-global using global::System.Threading.Tasks;

lab1_with_extracted_method/obj/lab1_with_extracted_method.csproj.nuget.dgspec.json

@@ -1,68 +0,0 @@
-{
-  "format": 1,
-  "restore": {
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-  },
-  "projects": {
-    "C:\\Users\\user\\source\\repos\\OOP_IO-2x_2023\\lab1_with_extracted_method\\lab1_with_extracted_method.csproj": {
-      "version": "1.0.0",
-      "restore": {
-        "projectUniqueName": "C:\\Users\\user\\source\\repos\\OOP_IO-2x_2023\\lab1_with_extracted_method\\lab1_with_extracted_method.csproj",
-        "projectName": "lab1_with_extracted_method",
-        "projectPath": "C:\\Users\\user\\source\\repos\\OOP_IO-2x_2023\\lab1_with_extracted_method\\lab1_with_extracted_method.csproj",
-        "packagesPath": "C:\\Users\\user\\.nuget\\packages\\",
-        "outputPath": "C:\\Users\\user\\source\\repos\\OOP_IO-2x_2023\\lab1_with_extracted_method\\obj\\",
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-        "fallbackFolders": [
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-          "C:\\Users\\user\\AppData\\Roaming\\NuGet\\NuGet.Config",
-          "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.FallbackLocation.config",
-          "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config"
-        ],
-        "originalTargetFrameworks": [
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-          "assetTargetFallback": true,
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-          "frameworkReferences": {
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lab1_with_extracted_method/obj/lab1_with_extracted_method.csproj.nuget.g.props

@@ -1,16 +0,0 @@
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-    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
-    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
-    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
-    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\user\.nuget\packages\;C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages</NuGetPackageFolders>
-    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
-    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">6.3.0</NuGetToolVersion>
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-  <ItemGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
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-    <SourceRoot Include="C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages\" />
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lab1_with_extracted_method/obj/lab1_with_extracted_method.csproj.nuget.g.targets

@@ -1,2 +0,0 @@
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lab1_with_extracted_method/obj/project.assets.json

@@ -1,74 +0,0 @@
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-          }
-        },
-        "runtimeIdentifierGraphPath": "C:\\Program Files\\dotnet\\sdk\\6.0.401\\RuntimeIdentifierGraph.json"
-      }
-    }
-  }
-}

lab1_with_extracted_method/obj/project.nuget.cache

@@ -1,8 +0,0 @@
-{
-  "version": 2,
-  "dgSpecHash": "VANdgElQYYOqAx91vfx9p1GWZX21FI7KRMpKYjMOBS/jaQDmnFh4D1hrZpo4+AA4DT9ZmEVXEUNcGLuCaXreTA==",
-  "success": true,
-  "projectFilePath": "C:\\Users\\user\\source\\repos\\OOP_IO-2x_2023\\lab1_with_extracted_method\\lab1_with_extracted_method.csproj",
-  "expectedPackageFiles": [],
-  "logs": []
-}

lab2.java

@@ -0,0 +1,78 @@
+import java.util.Scanner;
+import java.util.Random;
+
+public class lab2 {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+
+        System.out.println("Введіть кількість рядків матриці А:");
+        int mA = scan.nextInt();
+        System.out.println("Введіть кількість стовпців матриці А:");
+        int nA = scan.nextInt();
+        System.out.println("Введіть кількість рядків матриці B:");
+        int mB = scan.nextInt();
+        if (nA != mB) {
+            System.out.println("Щоб помножити матриці, потрібно, щоб кількість стовпців матриці А == кількості рядків матриці B");
+            return;
+        }
+        System.out.println("Введіть кількість стовпців матриці B:");
+        int nB = scan.nextInt();
+        System.out.println("Границя значень у матрицях:");
+        int upperbound = scan.nextShort();
+        int[][] matrixA = new int[mA][nA];
+        int[][] matrixB = new int[mB][nB];
+        int[][] matrixC = new int[mA][nB];
+        generationMatrixes(matrixA, matrixB, upperbound);
+        printMatrixC(matrixA, matrixB, matrixC);
+        AverageValueofElementsofEachColumn(matrixC);
+    }
+
+    private static void AverageValueofElementsofEachColumn(int[][] matrixC) {
+        System.out.println("Середнє значення елементів кожного стовпчика матриці:");
+        System.out.print("||");
+        for (int i = 0; i < matrixC.length; i++) {
+            double sum = 0;
+            for (int j = 0; j < matrixC[i].length; j++) {
+                sum += matrixC[j][i];
+            }
+            System.out.printf(" %.2f ||", (sum) / matrixC.length);
+        }
+    }
+
+    private static void printMatrixC(int[][] matrixA, int[][] matrixB, int[][] matrixC) {
+        for (int i = 0; i < matrixC.length; i++) {
+            for (int j = 0; j < matrixC[i].length; j++) {
+                for (int k = 0; k < matrixA[j].length; k++) {
+                    matrixC[i][j] += matrixA[i][k] * matrixB[k][j];
+                }
+            }
+        }
+        System.out.println("Матриця С:");
+        for (int i = 0; i < matrixC.length; i++) {
+            for (int j = 0; j < matrixC[i].length; j++) {
+                System.out.printf("|%4d", matrixC[i][j]);
+            }
+            System.out.println("|");
+        }
+    }
+
+    private static void generationMatrixes(int[][] matrixA, int[][] matrixB, int upperbound) {
+        Random rand = new Random();
+        System.out.println("Матриця А:");
+        for (short i = 0; i < matrixA.length; i++) {
+            for (int j = 0; j < matrixA[i].length; j++) {
+                matrixA[i][j] = rand.nextInt(upperbound);
+                System.out.printf("|%4d", matrixA[i][j]);
+            }
+            System.out.println("|");
+        }
+        System.out.println("Матриця B:");
+        for (short i = 0; i < matrixB.length; i++) {
+            for (int j = 0; j < matrixB[i].length; j++) {
+                matrixB[i][j] = rand.nextInt(upperbound);
+                System.out.printf("|%4d", matrixB[i][j]);
+            }
+            System.out.println("|");
+        }
+    }
+}

lab3.java

@@ -0,0 +1,21 @@
+public class lab3 {
+    public static void main(String[] args) {
+        StringBuilder txt = new StringBuilder("— соціальна мережа, яка є мережею мікроблогів, дає змогу користувачам надсилати короткі текстові повідомлення (до 2802 символів, до 2017 року — до 140 символів), використовуючи SMS,");
+        System.out.println(txt);
+        String[] words = txt.toString().split("\\s+");
+        StringBuilder result = new StringBuilder();
+        for (int i = 0; i < words.length; i++) {
+            StringBuilder word = new StringBuilder(words[i]);
+            StringBuilder firstLetter = new StringBuilder(word.substring(0, 1));
+            if (word.substring(1).contains(firstLetter.toString().toLowerCase()) || word.substring(1).contains(firstLetter)) {
+                String changedWord = firstLetter + word.substring(1).replaceAll(firstLetter.toString().toLowerCase(), "").replaceAll(firstLetter.toString(), "");
+                result.append(changedWord);
+                result.append(" ");
+            } else {
+                result.append(word);
+                result.append(" ");
+            }
+        }
+        System.out.println(result);
+    }
+}

laboratorna1/Program.cs

@@ -1,52 +0,0 @@
-using System;
-
-public class Lab1
-{
-    public static void Main(String[] args)
-    {
-        /*o1 = +
-         c3 = 0
-         o2 = *
-         c7 = short */
-
-         var A = 4;
-         short B = 3;
-         var N = 10;
-         var M = 10;
-
-         var C = 1;
-         var s = 0;
-
-         bool divisionByZero=false;
-
-
-        if ((A <= -C && -C <= N) || (B <= 0 && 0 <= M))
-        {
-            Console.WriteLine("Division by zero!");
-            return;
-        }
-      
-        for (int i = A; i <= N; i++)
-        {
-            if (i + C == 0) { 
-                Console.WriteLine("Division by zero!");
-                divisionByZero = true;
-                break; 
-            }
-            for (short j = B; j <= M; j++)
-            {
-                if (j == 0) {
-                    Console.WriteLine("Оскільки j = 0, то сума просто буде 0");
-                    break;
-                }
-                s += (i * j) / (i + C);
-            }
-        }
-
-        if (!divisionByZero)
-        {
-            Console.WriteLine($"s = {s};" );
-        }
-
-    }
-}

src/Lab2.java

@@ -1,13 +1,36 @@
 public class Lab2 {
     public static void main(String[] args) {
-        int[] array = {1, 2, 3};
+        final int A = 2;
-        /*for (int i = 0; i < array.length; i++) {
+        final int[][] MATRIX_B = {
+                {1, 202, 1, 1, 202, 3, 1, 202, 3,},
+                {1, 202, 1, 1, 202, 3, 1, 202, 3,},
+                {1, 1,   3, 1, 202, 3, 1, 202, 3,},
+//                {4, 5, 6,},
+        };
+
+        int[][] MATRIX_C = multiplication(A, MATRIX_B);
+
+        print(MATRIX_C);
+
+        System.out.println("Sum of smallest elements in every column: " + sumOfSmallestElementsInEveryColumn(MATRIX_C));
+
+        /*int[] array = {1, 2, 3};
+        int[] array2 = new int[3];
+        Object[] array3 = new String[3];
+        System.out.println(array3[0]); //nothing, trash from the memory, null || null
+        System.out.println(array2[0]); //nothing, trash from the memory, null || 0
+        System.out.println(array[0]); // || 1
+
+        int[][] matrix2 = new int[2][3];
+        matrix2[0] = new int[2];
+        matrix2[1] = new int[1];
+        for (int i = 0; i < array.length; i++) {
             if (i % 2 == 0) {
                 System.out.println("!" + array[i]);
             } else {
                 System.out.println("?" + array[i]);
             }
-        }*/
+        }
 
         for (int i = 0; i < array.length; i+=2) {
             System.out.println("!" + array[i]);
@@ -22,5 +45,58 @@ public class Lab2 {
                 {1, 2},
                 {3}
         };
+
+//        C=a×B, a - const
+
+
+//        final int[][] MATRIX_C = int;
+
+
+        MATRIX_B[0][0] = 2;
+        MATRIX_B[0] = new int[]{1, 2};
+        System.out.println(MATRIX_B[0][0]);
+        MATRIX_B = new int[][]{
+                {1, 2},
+                {3}
+        };*/
+    }
+
+    private static int sumOfSmallestElementsInEveryColumn(final int[][] MATRIX_C) {
+//        todo check different length of rows
+//        todo try to change i and j
+//        todo check repetition of minimal elements
+        int sum = 0;
+        for (int i = 0; i < MATRIX_C[0].length; i++) {
+            int tmpSmallest = MATRIX_C[0][i];
+            for (int j = 1; j < MATRIX_C.length; j++) {
+                if (MATRIX_C[j][i] < tmpSmallest) {
+                    tmpSmallest = MATRIX_C[j][i];
+                }
+            }
+            sum += tmpSmallest;
+        }
+        return sum;
+    }
+
+    private static void print(final int[][] MATRIX_C) {
+        for (int i = 0; i < MATRIX_C.length; i++) {
+            for (int j = 0; j < MATRIX_C[i].length; j++) {
+//                System.out.print(MATRIX_C[i][j] + "\t");//printf("%4d",
+                System.out.printf("%4d ", MATRIX_C[i][j]);//printf("%4d",
+            }
+            System.out.println();
+        }
+    }
+
+    private static int[][] multiplication(int A, final int[][] MATRIX_B) {
+        final int[][] MATRIX_C = new int[MATRIX_B.length][/*MATRIX_B[0].length*/]; // todo !!!DANGER different lengths of rows
+//        final int[][] MATRIX_C = MATRIX_B;
+        for (int i = 0; i < MATRIX_B.length; i++) {
+            MATRIX_C[i] = new int[MATRIX_B[i].length];
+            for (int j = 0; j < MATRIX_B[i].length; j++) {
+                MATRIX_C[i][j] = MATRIX_B[i][j] * A;
+            }
+        }
+        return MATRIX_C;
     }
 }