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There are a few errors in this java code: can you fix it please, its basically a debugging exercise: public static int sum(int n){ int n; for (int i=1; i<=n;i--){ sum++; } return sum; } }

There are a few errors in this java code: can you fix it please, its basically a debugging exercise: public static int sum(int n){ int n; for (int i=1; i<=n;i--){ sum++; } return sum; } }

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
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There are a few errors in this java code: can you fix it please, its basically a debugging exercise:

public static int sum(int n){

int n;

for (int i=1; i<=n;i--){

sum++;

}

return sum;

}

}

The image shows a screenshot of the Eclipse IDE with Java code editor open. Below is the transcription and explanation based on the visible content: ### Project Explorer Panel - **Lab 9** - JRE System Library [JavaSE-14] - `src (default package)` - `Apples.java` - `DoWhileLoops.java` - `ForLoops.java` - `WhileLoops.java` - **Quiz** - JRE System Library [JavaSE-14] - `src (default package)` - `Blue.java` - `Pumpkins.java` ### Java Code Editor The file `Blue.java` is open in the editor with the following code: ```java public class Blue { public static int sum(int n){ int sum; for (int i = 1; i <= n; i--){ sum++; } return sum; } } ``` ### Error in Console The console displays an error message: ``` Error: Main method must return a value of type void in Class Blue, please define the main method as: public static void main(String[] args) ``` ### Explanation - The code defines a `public class Blue` with a `static int` method called `sum`. - The method `sum` takes an integer `n` as a parameter, initializes an integer `sum`, and attempts to increment it in a `for` loop with a decrementing iterator, which will result in an infinite loop if `i` starts at 1. - The method returns the value of `sum`, but `sum` is not initialized, which would lead to a compilation error. - The console error indicates that the `main` method is missing, which is necessary to execute the program. ### Recommendations for Correction 1. **Initialization Error:** Initialize the `sum` variable. 2. **Loop Direction:** Correct the loop condition and iterator modification to `i++` if intended increment within the loop. 3. **Main Method:** Add a `main` method to execute the program, as per console message guidance: ```java public static void main(String[] args) { // Example execution int result = sum(5); System.out.println("Sum: " + result); } ``` This setup is suitable for educational purposes to understand common beginner errors in Java programming.
Transcribed Image Text:The image shows a screenshot of the Eclipse IDE with Java code editor open. Below is the transcription and explanation based on the visible content: ### Project Explorer Panel - **Lab 9** - JRE System Library [JavaSE-14] - `src (default package)` - `Apples.java` - `DoWhileLoops.java` - `ForLoops.java` - `WhileLoops.java` - **Quiz** - JRE System Library [JavaSE-14] - `src (default package)` - `Blue.java` - `Pumpkins.java` ### Java Code Editor The file `Blue.java` is open in the editor with the following code: ```java public class Blue { public static int sum(int n){ int sum; for (int i = 1; i <= n; i--){ sum++; } return sum; } } ``` ### Error in Console The console displays an error message: ``` Error: Main method must return a value of type void in Class Blue, please define the main method as: public static void main(String[] args) ``` ### Explanation - The code defines a `public class Blue` with a `static int` method called `sum`. - The method `sum` takes an integer `n` as a parameter, initializes an integer `sum`, and attempts to increment it in a `for` loop with a decrementing iterator, which will result in an infinite loop if `i` starts at 1. - The method returns the value of `sum`, but `sum` is not initialized, which would lead to a compilation error. - The console error indicates that the `main` method is missing, which is necessary to execute the program. ### Recommendations for Correction 1. **Initialization Error:** Initialize the `sum` variable. 2. **Loop Direction:** Correct the loop condition and iterator modification to `i++` if intended increment within the loop. 3. **Main Method:** Add a `main` method to execute the program, as per console message guidance: ```java public static void main(String[] args) { // Example execution int result = sum(5); System.out.println("Sum: " + result); } ``` This setup is suitable for educational purposes to understand common beginner errors in Java programming.
Expert Solution
Step 1
  • To resolve this error you have to declare the main method which is the initial method to be executed.
  • In the sum function, you've already defined int n  and you're declaring the same variable inside the sum function again.
  • Initialize the sum variable.
  • You need to increment the i variable in for loop in order to loop over n elements. (i++)
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