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Fibonacci Recursion - Illegal Start of expression!

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Join Date: Nov 2006

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Crono

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Fibonacci Recursion - Illegal Start of expression!

Nov 18th, 2006

I am writing a program that calculates Fibonacci numbers... But I keep getting an error on my code when I try to compile it...:

Fibonacci.java:18: illegal start of expression
public int calcFib (int n) {
^
1 error

I don't know what I am doing wrong? Someone help? Here's my code:

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import java.util.Scanner;
public class Fibonacci {
    public static void main(String[] args) {
        int fib;
        int n;
        Scanner scan = new Scanner(System.in);
        System.out.println("input a number");
            n = scan.nextInt();
 
        public int calcFib (int n) {
        int ans;
        if (n<2) {
            ans = n;
            return ans;
            }
        else {
            ans = (n-1) + (n-2);
            return ans;
            }
        }
        System.out.println(calcFib(n));
    }
}
import java.util.Scanner;
public class Fibonacci {
    public static void main(String[] args) {
        int fib;
        int n;
        Scanner scan = new Scanner(System.in);
        System.out.println("input a number");
            n = scan.nextInt();
        
        public int calcFib (int n) {
        int ans;
        if (n<2) {
            ans = n;
            return ans;
            }
        else {
            ans = (n-1) + (n-2);
            return ans;
            }
        }
        System.out.println(calcFib(n));
    }
}

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Join Date: Aug 2005

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iamthwee

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Re: Fibonacci Recursion - Illegal Start of expression!

Nov 19th, 2006

public int calcFib (int n) {
^

Could it be the word public perhaps?

Last edited by iamthwee; Nov 19th, 2006 at 9:38 am.

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Dukane

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Re: Fibonacci Recursion - Illegal Start of expression!

Nov 19th, 2006

I think the problem here is that you are writing a method inside of a method.

The

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public int calcFib(int n)
public int calcFib(int n)

should not be contained in the main method. Instead, form the class like this:

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public class Fibonacci {<blockquote>public static void main(String[] args) {<blockquote>//Insert main method body here
</blockquote>}
public static int calcFib(int n) {<blockquote>//Insert recursive method here
</blockquote>}
</blockquote>}
public class Fibonacci {<blockquote>public static void main(String[] args) {<blockquote>//Insert main method body here
</blockquote>}
public static int calcFib(int n) {<blockquote>//Insert recursive method here
</blockquote>}
</blockquote>}

Notice how I changed the method declaration to include static. You'll need to do that since you're not instantiating an object from the Fibonacci class, you're calling it in the "static context" from your static main method.

After making those changes to your class, I was able to compile it and run it.