練習問題

Question05-switch/.classpath

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
+	<classpathentry kind="src" path="src/main/java"/>
+	<classpathentry kind="output" path="build/classes"/>
+</classpath>

Question05-switch/.gitignore

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+/build/

Question05-switch/.project

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question05-switch</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.wst.common.project.facet.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Question05-switch/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
+org.eclipse.jdt.core.compiler.compliance=21
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=21

Question05-switch/.settings/org.eclipse.wst.common.project.facet.core.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<faceted-project>
+  <installed facet="java" version="21"/>
+</faceted-project>

Question05-switch/src/main/java/Q5_1.java

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+
+public class Q5_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		int num;
+		System.out.println("今日の運勢を占います");
+		
+		num = (int)(Math.random() * 6);
+		
+		switch(num){
+		
+			case 0:
+			System.out.println("あなたの運勢は「大吉」です");
+			break;
+			
+			case 1:
+			System.out.println("あなたの運勢は「吉」です");
+			break;
+			
+			case 2:
+			System.out.println("あなたの運勢は「中吉」です");
+			break;
+			
+			case 3:
+			System.out.println("あなたの運勢は「小吉」です");
+			break;
+			
+			case 4:
+			System.out.println("あなたの運勢は「末吉」です");
+			break;
+			
+			case 5:
+			System.out.println("あなたの運勢は「凶」です");
+			break;
+			
+		}
+	}
+
+}

Question05-switch/src/main/java/Q5_2.java

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+import java.util.Scanner;
+public class Q5_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("1つ目の数値を入力してください");
+		int num1 = sc.nextInt();
+		
+		
+		System.out.println("2つ目の数値を入力してください");
+		int num2 = sc.nextInt();
+		
+		
+		System.out.println("計算方法を選択してください");
+		String choice = sc.next();
+		
+		sc.close();
+		
+		 switch (choice) {
+		 
+         case "+":
+        	 System.out.println((num1 + num2));
+             break;
+             
+         case "-":
+        	 System.out.println((num1 - num2));
+             break;
+             
+         case "*":
+        	 System.out.println((num1 * num2));
+             break;
+             
+         case "/":
+        	 System.out.println((num1 / num2));
+             break;
+             
+         case "%":
+        	 System.out.println((num1 % num2));
+             break;
+             
+         default:
+        	 System.out.println("計算に失敗しました");
+		
+		 }
+		 
+	} 
+
+}