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Variable Error during compiling [message #1815963]

Wed, 16 October 2019 01:56

Eclipse User

Hi! I'm new to Java using eclipse kepler. I am following a video tutorial and i followed all the syntax correctly but eclipse says "temp temp cannot be resolve to a variable"

My question is: Is it a syntax error or an eclipse version problem?
Glad to have your comments. Thanks.

package Day.examples;

public class ExampleArray {

public static void main(String[] args) {
// TODO Auto-generated method stub

int []x = {10,20,30,40,50};
System.out.println(x[0]+" "+x[3]);

for (int temp : x);
{System.out.println(temp);}

}
}

Re: Variable Error during compiling [message #1815969 is a reply to message #1815963]

Wed, 16 October 2019 07:07

Eclipse User

Hi,

This is a Java error: you have a semicolon (;) right after the declaration of your for loop.

As a result, the ; is evaluated as an empty statement and is seen as the body of your loop. Meanwhile, your print statement is considered to be outside of the loop and thus cannot access the temp variable.

This is better seen when the code is formatted as follows:

package Day.examples;

public class ExampleArray {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        int[] x = { 10, 20, 30, 40, 50 };
        System.out.println(x[0] + " " + x[3]);

        for (int temp : x)
            ;
        {
            System.out.println(temp);
        }
    }
}

[Updated on: Wed, 16 October 2019 07:08] by Moderator

Re: Variable Error during compiling [message #1816003 is a reply to message #1815969]

Wed, 16 October 2019 22:47

Eclipse User

Hi sir. Thank you very much for your response. I've followed your instruction and I am still having the same error message. I found the problem by accident in the JRE system library that I am using. The default should be C:\Program files\Java\jdk 1.8.0.221 instead of C:\Program files\Java\jre 1.8.0.231. I remember that I installed java jre 1.80.231 and eclipse switch automatically to the new system library. So, when i switch back to the original library which is java JDK, it works fine.

package Day.examples;

public class ExampleArray {

public static void main(String[] args) {
// TODO Auto-generated method stub

int []x = {10,20,30,40,50};
System.out.println(x[0]+" "+x[3]);
for (int temp : x){
System.out.println(temp);
}

}
}

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