練習問題

Question02-Expressions/.classpath

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+<?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>

Question02-Expressions/.gitignore

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+/build/

Question02-Expressions/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question02-Expressions</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>

Question02-Expressions/.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

Question02-Expressions/.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>

Question02-Expressions/src/main/java/Q2_1.java

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+
+public class Q2_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		int sum;
+		int diff;
+		int mulch;
+		int div;
+		int rem;
+		
+		sum = 6+2;
+		diff = 6-2;
+		mulch = 6*2;
+		div = 6/2;
+		rem = 17%5;
+		
+				System.out.println("変数sum  :"+(sum));
+				System.out.println("変数diff :"+(diff));
+				System.out.println("変数mulch:"+(mulch));
+				System.out.println("変数div  :"+(div));
+				System.out.println("変数rem  :"+(rem));
+				
+	}
+
+}

Question02-Expressions/src/main/java/Q2_2.java

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+
+public class Q2_2 {
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		String Lastname;
+		String Firstname;
+		
+		Lastname = "山田";
+		Firstname = "太郎";
+		
+		System.out.println((Lastname)+(Firstname));
+		
+	}
+}

Question02-Expressions/src/main/java/Q2_3.java

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+
+public class Q2_3 {
+	public static void main(String[] args) {
+		
+		int num = 10;
+		num = num + 5;
+		
+		System.out.println(num);
+		
+	}
+}

Question02-Expressions/src/main/java/Q2_4.java

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+
+public class Q2_4 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		double sum;
+		sum = 10 + 3.14;
+		
+		System.out.println(sum);
+		
+		
+	}
+
+}

Question02-Expressions/src/main/java/Q2_5.java

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+
+public class Q2_5 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		int age;
+		int diff;
+		
+		age = 20;
+		diff = 5;
+		
+		
+		System.out.println("山田さんは"+age+"歳です");
+		System.out.println(diff+"年後には"+(age + diff)+"歳になります");
+	}
+
+}

Question02-Expressions/src/main/java/Q2_6.java

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+
+public class Q2_6 {
+	public static void main(String[] args) {
+		float num1;
+		float num2;
+		float result;
+		
+		double kotaewakaran;
+		
+		num1 = 9;
+		num2 = 2;
+		
+		result = (float)num1/num2;
+		
+		kotaewakaran = (double)9/2;
+		
+		System.out.println(result);
+		System.out.println(kotaewakaran);
+	}
+}

Question02-Expressions/src/main/java/Q2_7.java

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+
+public class Q2_7 {
+	public static void main(String[] args) {
+		double num;
+		num = 1.0;
+		
+		
+		
+		System.out.println((int)num);
+		
+	}
+}

Question02-Expressions/src/main/java/Q2_8.java

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+
+public class Q2_8 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		double money = 1000;
+		double price = 580;
+		double taxRate = 0.08;
+		
+		int amount;
+		
+		amount = (int)(price * (1 + taxRate));
+		
+		System.out.println("残金は"+(int)(money-amount)+"円です。");
+		
+		
+		
+	}
+
+}