Миронов Илья. Лабораторная №5

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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-new</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <name>ST-5-new</name>
+    <url>http://maven.apache.org</url>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <junit.jupiter.version>5.10.0</junit.jupiter.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.0.0-M5</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/Program.java

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+public class Program {
+    public static void main(String[] args){
+        double val = Double.parseDouble("4.0");
+        Sqrt sqrt = new Sqrt(val);
+        double result = sqrt.calc();
+
+        System.out.println("Sqrt of " + val + " = " + result);
+    }
+}

src/main/java/Sqrt.java

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+public 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/SqrtTests.java

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+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class SqrtTests {
+
+    @Test
+    public void sqrtAverageTestOne(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.average(0.0, 0.0), 0.0, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtAverageTestTwo(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.average(-100.0, 100.0), 0.0, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtAverageTesThree(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.average(15.0, 29.0), 22.0, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtGoodTestOne(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertTrue(sqrt.good(2.0, 4.0));
+
+        assertFalse(sqrt.good(15.0, 112.5));
+    }
+
+    @Test
+    public void sqrtGoodTestTwo(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertTrue(sqrt.good(32.0, 1024.0));
+
+        assertFalse(sqrt.good(1.0, 4.0));
+            }
+
+    @Test
+    public void sqrtGoodTestThree(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertTrue(sqrt.good(8.0, 64.0000000000001));
+
+        assertFalse(sqrt.good(5.0, 17.0));
+    }
+
+    @Test
+    public void sqrtImproveTestOne(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.improve(14.0, 8.0), 7.2857142857,sqrt.delta);
+    }
+
+    @Test
+    public void sqrtImproveTestTwo(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.improve(100.0, 32.0), 50.16,sqrt.delta);
+    }
+
+    @Test
+    public void sqrtImproveTestThree(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.improve(91.0, 4.0), 45.5219780219,sqrt.delta);
+    }
+
+    @Test
+    public void sqrtIterTestOne(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.iter(2.0, 4.0), 2.0, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtIterTestTwo(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.iter(34.0, 80.0), 8.944271909999177, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtIterTestThree(){
+        Sqrt sqrt = new Sqrt(100.0);
+
+        assertEquals(sqrt.iter(94.0, 225.0), 15.0, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtCalcTestOne(){
+        Sqrt sqrt = new Sqrt(2.0);
+
+        assertEquals(sqrt.calc(), 1.414213562, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtCalcTesTwo(){
+        Sqrt sqrt = new Sqrt(4.0);
+
+        assertEquals(sqrt.calc(), 2.0, sqrt.delta);
+    }
+
+    @Test
+    public void sqrtCalcTesThree(){
+        Sqrt sqrt = new Sqrt(1024.0);
+
+        assertEquals(sqrt.calc(), 32.0, sqrt.delta);
+    }
+}