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Good job!” and then ask for another input. When the user types an odd number, display an error message, "x is not an even

Good job!” and then ask for another input. When the user types an odd number, display an error message, "x is not an even

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Write an application that asks a user to type an even number or the sentinel value 999 to stop. When the user types an even number, display the message “Good job!” and then ask for another input. When the user types an odd number, display an error message, "x is not an even number", and then ask for another input. When the user types the sentinel value 999, end the program.

### Java Program: EvenEntryLoop.java This Java program, `EvenEntryLoop.java`, is structured to create a class for handling even number entries. Below is the annotated code with explanations: ```java import java.util.*; // This line imports all classes from the Java Utilities package, allowing the program to utilize built-in utility classes. public class EvenEntryLoop { // This declares a public class named EvenEntryLoop. public static void main (String args[]) { // The main method is the entry point of any Java program. // Write your code here // Placeholder comment indicating where the actual code logic should be implemented. } } ``` #### Explanation: - **Import Statement**: `import java.util.*;` - This imports all utility classes from the `java.util` package, which can include collections like ArrayList, LinkedList, HashMap, and tools such as the Scanner for input. - **Class Declaration**: `public class EvenEntryLoop` - A class named `EvenEntryLoop` is declared as public, meaning it can be accessed by any other class. - **Main Method**: - Defined as `public static void main (String args[])`, this is the program's starting point. - `public`: This indicates the method is accessible from outside the class. - `static`: Means it belongs to the class, rather than instances of the class. - `void`: Indicates that the method does not return any value. - `main`: The name of the method, which Java looks for as a starting point of a program. - `String args[]`: Parameter accepting command-line arguments as an array of String objects. - **Comment**: `// Write your code here` - This comment serves as a placeholder, suggesting developers where to write their logic or code implementation. This simple structure sets up for creating applications that potentially require user input and processing to identify and react to even numbers.
Transcribed Image Text:### Java Program: EvenEntryLoop.java This Java program, `EvenEntryLoop.java`, is structured to create a class for handling even number entries. Below is the annotated code with explanations: ```java import java.util.*; // This line imports all classes from the Java Utilities package, allowing the program to utilize built-in utility classes. public class EvenEntryLoop { // This declares a public class named EvenEntryLoop. public static void main (String args[]) { // The main method is the entry point of any Java program. // Write your code here // Placeholder comment indicating where the actual code logic should be implemented. } } ``` #### Explanation: - **Import Statement**: `import java.util.*;` - This imports all utility classes from the `java.util` package, which can include collections like ArrayList, LinkedList, HashMap, and tools such as the Scanner for input. - **Class Declaration**: `public class EvenEntryLoop` - A class named `EvenEntryLoop` is declared as public, meaning it can be accessed by any other class. - **Main Method**: - Defined as `public static void main (String args[])`, this is the program's starting point. - `public`: This indicates the method is accessible from outside the class. - `static`: Means it belongs to the class, rather than instances of the class. - `void`: Indicates that the method does not return any value. - `main`: The name of the method, which Java looks for as a starting point of a program. - `String args[]`: Parameter accepting command-line arguments as an array of String objects. - **Comment**: `// Write your code here` - This comment serves as a placeholder, suggesting developers where to write their logic or code implementation. This simple structure sets up for creating applications that potentially require user input and processing to identify and react to even numbers.
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