Филатов Максим. Лабораторная работа №5. (Исправленная)

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.example</groupId>
+  <artifactId>ST-5</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>ST-5</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <version>5.10.2</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>5.10.2</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

src/main/java/org/example/Program.java

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+package org.example;
+
+class Program
+{
+    public static void main(String[] args)
+    {
+        double val=Double.parseDouble("2.0");
+        Sqrt sqrt=new Sqrt(val);
+        double result=sqrt.calc();
+        System.out.println("Sqrt of " + val + " = " + result);
+    }
+}

src/main/java/org/example/Sqrt.java

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+package org.example;
+
+class Sqrt
+{
+    double delta=0.00000001;
+    double arg;
+
+    public Sqrt(double arg) {
+        this.arg=arg;
+    }
+    public double average(double x,double y) {
+        return (x+y)/2.0;
+    }
+    public boolean good(double guess,double x) {
+        return Math.abs(guess*guess-x)<delta;
+    }
+    public double improve(double guess,double x) {
+        return average(guess,x/guess);
+    }
+    public double iter(double guess, double x) {
+        if(good(guess,x))
+            return guess;
+        else
+            return iter(improve(guess,x),x);
+    }
+    public double calc() {
+        return iter(1.0,arg);
+    }
+}

src/test/java/org/example/SqrtTest.java

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+package org.example;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class SqrtTest {
+    private Sqrt sqrt;
+
+    @Test
+    public void testAverage() {
+        sqrt = new Sqrt(16.0);
+        double result = sqrt.average(4.0, 8.0);
+        Assertions.assertEquals(6.0, result);
+    }
+
+    @Test
+    public void testGood() {
+        sqrt = new Sqrt(16.0);
+        boolean result1 = sqrt.good(4.0, 16.0);
+        Assertions.assertTrue(result1);
+
+        boolean result2 = sqrt.good(3.0, 16.0);
+        Assertions.assertFalse(result2);
+    }
+
+    @Test
+    public void testImprove() {
+        sqrt = new Sqrt(16.0);
+        double result = sqrt.improve(4.0, 16.0);
+        Assertions.assertEquals(4.0, result, sqrt.delta);
+    }
+
+    @Test
+    public void testIter() {
+        sqrt = new Sqrt(16.0);
+        double result1 = sqrt.iter(4.0, 16.0);
+        Assertions.assertEquals(4.0, result1, sqrt.delta);
+
+        double result2 = sqrt.iter(1.0, 16.0);
+        Assertions.assertEquals(4.0, result2, sqrt.delta);
+    }
+
+    @Test
+    public void testCalc() {
+        sqrt = new Sqrt(16.0);
+        double result = sqrt.calc();
+        Assertions.assertEquals(4.0, result, sqrt.delta);
+    }
+}