Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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I'm recieving a ton of errors on my Java doc for an assignment I have can anyone help me fix them?
code:
package chapter.pkg6.part.pkg2.assignment;
/**
*
* @author matty
*/
public class Chapter6Part2Assignment {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// Method
long cardnumber = 4440967484181607L;
System.out.println("Please enter the card number/n");
System.out.println(cardnumber + " is " + (validitychk(cardnumber) ? "valid" : "invalid"));
// Return true if the card number is valid
public static boolean validitychk(long cnumber) {
return (thesize(cardnumber)>=13&& thesize(cnumber)<= 16)&&(prefixmatch(cardnumber, 4)
|| prefixmatch(cardnumber,5) || prefixmatch(cnumber,37) || prefixmatch(cardnumber, 6))
&& ((sumdoubleeven(cnumber) + sumodd(cnumber)) % 10 == 0);
}
public static int sumdoubleeven(long cardnumber) {
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 2; i >= 0; i -= 2)
sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2);
return sum;
}
public static int getDigit(int cardnumber) {
if (cardnumber < 9)
return cardnumber;
return cardnumber / 10 + cardnumber % 10;
}
public static int sumodd(long cardnumber) {
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 1; i >= 0; i -= 2)
sum += Integer.parseInt(num.charAt(i) + "");
return sum;
}
}
I attached an image of the code and the error issue as well.
![### Java Program for Credit Card Validation
This code is a Java program used to validate a credit card number. It uses Luhn's algorithm, which involves checking the size and prefix of the card number.
#### Code Explanation
```java
/**
* Author: [Author Name]
* Param: args the command line arguments
*/
public class Chapter6Part2Assignment {
// Main method
public static void main(String[] args) {
long cardnumber = 4410976841816071L;
System.out.println("Please enter the card number:\n");
System.out.println(cardnumber + " is " + (validitychk(cardnumber) ? "valid" : "invalid"));
// Return true if the card number is valid
}
public static boolean validitychk(long cnumber) {
return (thesize(cnumber) >= 13 && thesize(cnumber) <= 16) && (prefixmatch(cnumber, 4)
|| prefixmatch(cnumber, 5) || prefixmatch(cnumber, 6) || prefixmatch(cnumber, 37))
&& ((sumdoubleeven(cnumber) + sumodd(cnumber)) % 10 == 0);
}
public static int sumdoubleeven(long cardnumber) {
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 2; i >= 0; i -= 2) {
sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2);
}
return sum;
}
public static int getDigit(int cardnumber) {
if (cardnumber < 9)
return cardnumber;
return cardnumber / 10 + cardnumber % 10;
}
public static int sumodd(long cardnumber) {
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 1; i >= 0; i -= 2)
sum += Integer.parseInt(num.charAt(i) + "");
return sum;
}
public static boolean prefixmatch(long cardnumber, int d) {
return getprefix(cardnumber, thesize(d)) == d;
}
public static int thesize(long d) {
String num = d + "";
return num.length();](https://content.bartleby.com/qna-images/question/e73c8c7e-1fd5-4385-96bf-6506c467a37a/c1e44586-57f1-4580-8ee0-9225311403c9/6kyby6w_processed.png)
Transcribed Image Text:### Java Program for Credit Card Validation
This code is a Java program used to validate a credit card number. It uses Luhn's algorithm, which involves checking the size and prefix of the card number.
#### Code Explanation
```java
/**
* Author: [Author Name]
* Param: args the command line arguments
*/
public class Chapter6Part2Assignment {
// Main method
public static void main(String[] args) {
long cardnumber = 4410976841816071L;
System.out.println("Please enter the card number:\n");
System.out.println(cardnumber + " is " + (validitychk(cardnumber) ? "valid" : "invalid"));
// Return true if the card number is valid
}
public static boolean validitychk(long cnumber) {
return (thesize(cnumber) >= 13 && thesize(cnumber) <= 16) && (prefixmatch(cnumber, 4)
|| prefixmatch(cnumber, 5) || prefixmatch(cnumber, 6) || prefixmatch(cnumber, 37))
&& ((sumdoubleeven(cnumber) + sumodd(cnumber)) % 10 == 0);
}
public static int sumdoubleeven(long cardnumber) {
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 2; i >= 0; i -= 2) {
sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2);
}
return sum;
}
public static int getDigit(int cardnumber) {
if (cardnumber < 9)
return cardnumber;
return cardnumber / 10 + cardnumber % 10;
}
public static int sumodd(long cardnumber) {
int sum = 0;
String num = cardnumber + "";
for (int i = thesize(cardnumber) - 1; i >= 0; i -= 2)
sum += Integer.parseInt(num.charAt(i) + "");
return sum;
}
public static boolean prefixmatch(long cardnumber, int d) {
return getprefix(cardnumber, thesize(d)) == d;
}
public static int thesize(long d) {
String num = d + "";
return num.length();
Transcribed Image Text:### Error Analysis and Troubleshooting in Java Programming
**Output Log Details:**
The following is a transcript of an output log from a Java programming environment, specifically related to an error encountered during the execution of a code snippet.
```
run:
Please enter the card number
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: chapter.pkg6.part.pkg2.assignment.Chapter6Part2Assignment.thesize
at chapter.pkg6.part.pkg2.assignment.Chapter6Part2Assignment.validciychk(Chapter6Part2Assignment.java:27)
at chapter.pkg6.part.pkg2.assignment.Chapter6Part2Assignment.main(Chapter6Part2Assignment.java:22)
C:\Users\matty\AppData\Local\NetBeans\Cache\12.4\executor-snippets\run.xml:111: The following error occurred while executing this line:
C:\Users\matty\AppData\Local\NetBeans\Cache\12.4\executor-snippets\run.xml:94: Java returned: 1
BUILD FAILED (total time: 3 seconds)
```
**Explanation and Key Points:**
1. **User Input Request:**
- The program prompts the user with "Please enter the card number," indicating it expects an input, likely for processing thereafter.
2. **Error Description:**
- An `Exception in thread "main"` occurs, which is a common type of error that indicates something went wrong during the execution of the main method of the program.
- The specific error is `java.lang.RuntimeException` with a message stating "Uncompilable source code - Erroneous sym type."
- This suggests there is an error in the code's syntax or logic that prevents successful compilation.
3. **Error Location:**
- The error is traced back to the method `validciychk` in the file `Chapter6Part2Assignment.java` at line 27.
- Another part of the code refers to `Chapter6Part2Assignment.main` at line 22, suggesting that the main method is also involved in the error cascade.
4. **File Path and Runtime:**
- The file paths suggest that this is executed within the NetBeans IDE, with cache directories indicating where the run files are stored.
- The message states "BUILD FAILED (total time: 3 seconds)" confirming that the build process was
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