hagenfr84288/TriangleCheckerAssignment
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Check now working for all kinds of triangles.

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Including Tests for all Checks.
This commit is contained in:
Frederik Hagen 2021-12-21 14:41:48 +01:00
parent 6ec752ee68
commit cb1c503016
7 changed files with 156 additions and 46 deletions
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.idea/libraries/jars.xml generated Normal file
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TriangleCheckerAssignment.iml Normal file
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112
src/TriangleChecker.java
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import java.util.Arrays;
import java.util.Scanner;
public class TriangleChecker {
public enum TriangleType {
NONE,
NORMAL,
ISOSCELES, // Gleichschenklig
EQUILATERAL // Gleichseitig
}
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.println("Geben Sie die Seitenlängen ein.");
float a = enterFloat(s, "a: ");
float b = enterFloat(s, "b: ");
float c = enterFloat(s, "c: ");
s.close();
printAnalysis(a, b, c);
}
// Eingabe einer Seitenlänge
private static float enterFloat(Scanner s, String prompt) {
System.out.print(prompt);
return s.nextFloat();
}
// Ausgabe der ermittelten Dreiecksart
private static void printAnalysis(float a, float b, float c) {
TriangleType type = checkTriangle(a, b, c);
switch (type) {
case NONE:
System.out.println("Kein Dreieck");
break;
case NORMAL:
System.out.println("Dreieck");
break;
case ISOSCELES:
System.out.println("Gleichschenkliges Dreieck");
break;
case EQUILATERAL:
System.out.println("Gleichseitiges Dreieck");
break;
public enum TriangleType {
NONE,
NORMAL,
ISOSCELES, // Gleichschenklig
EQUILATERAL // Gleichseitig
}
}
// Analyse der Dreiecksart
public static TriangleType checkTriangle(float a, float b, float c) {
return TriangleType.NONE;
}
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.println("Geben Sie die Seitenlängen ein.");
float a = enterFloat(s, "a: ");
float b = enterFloat(s, "b: ");
float c = enterFloat(s, "c: ");
s.close();
printAnalysis(a, b, c);
}
// Eingabe einer Seitenlänge
private static float enterFloat(Scanner s, String prompt) {
System.out.print(prompt);
return s.nextFloat();
}
// Ausgabe der ermittelten Dreiecksart
private static void printAnalysis(float a, float b, float c) {
TriangleType type = checkTriangle(a, b, c);
switch (type) {
case NONE:
System.out.println("Kein Dreieck");
break;
case NORMAL:
System.out.println("Dreieck");
break;
case ISOSCELES:
System.out.println("Gleichschenkliges Dreieck");
break;
case EQUILATERAL:
System.out.println("Gleichseitiges Dreieck");
break;
}
}
// Analyse der Dreiecksart
public static TriangleType checkTriangle(float a, float b, float c) {
//find Hypotenuse
float[] tmp = {a, b, c};
Arrays.sort(tmp);
float hypo = tmp[2];
float a1 = tmp[0];
float b1 = tmp[1];
//normal
if (a1 + b1 > hypo) {
//gleichseitig
if (a1 + b1 + hypo == 3 * a1)
return TriangleType.EQUILATERAL;
//gleichschenklig
if (a1 == b1 || b1 == hypo || a1 == hypo)
return TriangleType.ISOSCELES;
return TriangleType.NORMAL;
}
return TriangleType.NONE;
}
}

47
test/TriangleCheckerTest.java
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import org.junit.Test;
import java.util.Arrays;
import static org.junit.Assert.*;
public class TriangleCheckerTest {
@Test
public void testValidTriangle() {
@ -18,5 +21,47 @@ public class TriangleCheckerTest {
assertEquals(TriangleChecker.TriangleType.NORMAL, type);
}
@Test
public void testEquilateralTriangle() {
// Arrange
float a = 2;
float b = 2;
float c = 2;
// Act
TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
// Assert
assertEquals(TriangleChecker.TriangleType.EQUILATERAL, type);
}
@Test
public void testIsocelesTriangle() {
// Arrange
float a = 2;
float b = 2;
float c = 3;
// Act
TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
// Assert
assertEquals(TriangleChecker.TriangleType.ISOSCELES, type);
}
@Test
public void testNoTriangle() {
// Arrange
float a = 2;
float b = 2;
float c = 4;
// Act
TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
// Assert
assertEquals(TriangleChecker.TriangleType.NONE, type);
}
}