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Thread: Unreachable statement problem

  1. #1
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    Default Unreachable statement problem

    I have been working on the following for hours only to get unreachable code for line 44 return (sum);. Need some fresh eyes asap please.

    package evenFibonaccisum;
     
    import java.io.*;
    import java.math.*;
    import java.text.*;
    import java.util.*;
    import java.util.regex.*;
     
    public class Sum {
        static int sumEvenFib(int start, int end) {
            int fn1 = start; //fn_1
            int fn2 = getNextTerm(start); //fn_2
            int fn = 0; //current term
            int sum = fn1 + fn2; //holds sum of even terms
                while (fn<=end) {
                    fn=fn1+fn2;
                    fn1=fn2;
                    fn2=fn;
                       if(fn>=end){
                           break ;
                        }
                       else{
     
                           if(fn%2==0){
     
                               sum=sum+fn;
                            }
                        }
                }
     
            int getNextTerm; 
            int x = 0; {
                int a=0;
                int b=1;
                int fib=1;
                for(int i=0; i<=x; i++){ 
                    fib=a+b;  
                    a=b;  
                    b=fib;        
                }
                return (fib);  
            } 
     
          return (sum);
        }
     
    private static int getNextTerm(int start) {
    		// TODO Auto-generated method stub
    		return 0;
    	}
     
    private static final Scanner scanner = new Scanner(System.in);
     
    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
     
        int start = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])*"); 
     
        int end = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])*");
     
        int res = sumEvenFib(start, end);
     
        bufferedWriter.write(String.valueOf(res));
        bufferedWriter.newLine();
     
        bufferedWriter.close();
     
        scanner.close();
     
        }
       }
    Last edited by Norm; July 19th, 2018 at 05:25 AM. Reason: Added code tags

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: HELP...I CAN'T FIGURE THIS OUT

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.

    I've done it this time for you.

    There is a useless pair of {}s in the code starting at this line:
    int x = 0; {
    Remove that { and its pairing } and you will see two return statements immediately next to each other.
    The second return statement is unreachable code
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: HELP...I CAN'T FIGURE THIS OUT

    Thank you. Removed the {}s. How do I correct for this unreachable code to ensure that I am able to get a result from my input?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: HELP...I CAN'T FIGURE THIS OUT

    How do I correct for this unreachable code
    Remove one of the return statements so there is only one. For example:
       return val1;
       return val2;    // this statement unreachable
    Removing one of the above return statements so that there is only one return statement will remove the unreachable error.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Unreachable statement problem

    Hello,

    here is in Bold the statement that is unreachable. I will intentionally not omit the [code] tags.

    static int sumEvenFib(int start, int end) {
    int fn1 = start; //fn_1
    int fn2 = getNextTerm(start); //fn_2
    int fn = 0; //current term
    int sum = fn1 + fn2; //holds sum of even terms
    while (fn<=end) {
    fn=fn1+fn2;
    fn1=fn2;
    fn2=fn;
    if(fn>=end){
    break ;
    }
    else{

    if(fn%2==0){

    sum=sum+fn;
    }
    }
    }

    int getNextTerm;
    int x = 0; {
    int a=0;
    int b=1;
    int fib=1;
    for(int i=0; i<=x; i++){
    fib=a+b;
    a=b;
    b=fib;
    }
    return (fib);
    }

    return (sum);
    }

    I believe this code needs a little bit of refactoring.

    Regards
    Alin

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