Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
Bartleby Related Questions Icon

Related questions

bartleby

Concept explainers

Question

New JAVA Code can only be added between lines 24 and 26. All other lines can not be edited in any way. (As seen in Image). 

```java
try {
    coneWidth = scnr.nextInt();

    if (coneWidth <= 0) {
        throw new Exception("Cone's width (in cm) must be positive");
    }

    triesLeft = 0;
    System.out.print("Valid input: ");
    System.out.println("Cone's width (in cm) is " + coneWidth);
}

/* Your code goes here */
}
}
```

### Explanation

This Java code snippet demonstrates basic error checking for user input. It reads an integer value for `coneWidth` and ensures that it is positive. If the input is not positive, the program throws an exception with a message indicating that the cone's width must be positive. Upon receiving valid input, it prints a message confirming the cone's width.

- **Line 13-29**: The code is encapsulated in a try block to handle exceptions.
- **Line 14**: It reads an integer input from the user and assigns it to `coneWidth`.
- **Line 16-18**: It checks if `coneWidth` is less than or equal to zero, and if so, throws an exception with a descriptive message.
- **Line 20-22**: Once valid input is confirmed, it prints a validation message and the cone's width.
- **Line 25**: A comment indicates where additional code can be implemented.

This code is ideal for educational purposes, illustrating how to manage input validation and exception handling in Java.
expand button
Transcribed Image Text:```java try { coneWidth = scnr.nextInt(); if (coneWidth <= 0) { throw new Exception("Cone's width (in cm) must be positive"); } triesLeft = 0; System.out.print("Valid input: "); System.out.println("Cone's width (in cm) is " + coneWidth); } /* Your code goes here */ } } ``` ### Explanation This Java code snippet demonstrates basic error checking for user input. It reads an integer value for `coneWidth` and ensures that it is positive. If the input is not positive, the program throws an exception with a message indicating that the cone's width must be positive. Upon receiving valid input, it prints a message confirming the cone's width. - **Line 13-29**: The code is encapsulated in a try block to handle exceptions. - **Line 14**: It reads an integer input from the user and assigns it to `coneWidth`. - **Line 16-18**: It checks if `coneWidth` is less than or equal to zero, and if so, throws an exception with a descriptive message. - **Line 20-22**: Once valid input is confirmed, it prints a validation message and the cone's width. - **Line 25**: A comment indicates where additional code can be implemented. This code is ideal for educational purposes, illustrating how to manage input validation and exception handling in Java.
The while loop makes up to two attempts to read a positive integer from input into `coneWidth`. Use multiple exception handlers to:

- Catch an `InputMismatchException`, output "Unexpected input: The ConeWidth program quits", and assign `triesLeft` with 0.
- Catch an `Exception`, output the message of the Exception, and subtract 1 from `triesLeft`.

End each output with a newline.

**Example Outputs:**

1. **If the input is 23, then the output is:**

   ```
   Tries left: 2
   Valid input: Cone's width (in cm) is 23
   ```

2. **If the input is R, then the output is:**

   ```
   Tries left: 2
   Unexpected input: The ConeWidth program quits
   ```

3. **If the input is -28 23, then the output is:**

   ```
   Tries left: 2
   Cone's width (in cm) must be positive
   Tries left: 1
   Valid input: Cone's width (in cm) is 23
   ```

```java
1  import java.util.Scanner;
2  import java.util.InputMismatchException;
3  
4  public class ConeWidth {
5     public static void main(String[] args) {
6        Scanner scnr = new Scanner(System.in);
7        int coneWidth;
8        int triesLeft = 2;
9        
10       while (triesLeft > 0) {
11          System.out.println("Tries left: " + triesLeft);
12          
13          try {
14             coneWidth = scnr.nextInt();
15             
16             if (coneWidth <= 0) {
17                throw new Exception("Cone's width (in cm) must be positive");
18             }
```
expand button
Transcribed Image Text:The while loop makes up to two attempts to read a positive integer from input into `coneWidth`. Use multiple exception handlers to: - Catch an `InputMismatchException`, output "Unexpected input: The ConeWidth program quits", and assign `triesLeft` with 0. - Catch an `Exception`, output the message of the Exception, and subtract 1 from `triesLeft`. End each output with a newline. **Example Outputs:** 1. **If the input is 23, then the output is:** ``` Tries left: 2 Valid input: Cone's width (in cm) is 23 ``` 2. **If the input is R, then the output is:** ``` Tries left: 2 Unexpected input: The ConeWidth program quits ``` 3. **If the input is -28 23, then the output is:** ``` Tries left: 2 Cone's width (in cm) must be positive Tries left: 1 Valid input: Cone's width (in cm) is 23 ``` ```java 1 import java.util.Scanner; 2 import java.util.InputMismatchException; 3 4 public class ConeWidth { 5 public static void main(String[] args) { 6 Scanner scnr = new Scanner(System.in); 7 int coneWidth; 8 int triesLeft = 2; 9 10 while (triesLeft > 0) { 11 System.out.println("Tries left: " + triesLeft); 12 13 try { 14 coneWidth = scnr.nextInt(); 15 16 if (coneWidth <= 0) { 17 throw new Exception("Cone's width (in cm) must be positive"); 18 } ```
Expert Solution
Check Mark
Knowledge Booster
Background pattern image
Computer Science
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Text book image
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Text book image
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Text book image
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
Text book image
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Text book image
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Text book image
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education