奇怪的语法错误，插入}以完成阻止

Question

I'm writing a program on finding the prime number and I ran into a syntax error 'Syntax Error, Insert } to Complete Block' when I added in the 'else if'.

I've marked in asterisks where I'm getting the error.

import java.math.*;

public class FindThePrime {

    public static void main(String[] args) {

        int x = 2; 
        int nextPrime =  1;
        for (int i = 1; i <= 10; ++i){



        int count = 0;

        while (nextPrime > x);{

            if (nextPrime % x == 0);{


                ++nextPrime; 
                x = 2;
                ++count;

            }
            if (nextPrime < x); {
                ++x;
            }
        ***}***



    }
        else if{

        }
    }

}

I read other reports of the same problem and the aren't any help. I counted the number of { & } and they come up to an even number.

Any suggestions?

ps: This project is far from complete so forgive the roughness of it. Also, don't tell me how to get the results I want, I don't want to spoil the challenge!

Answer 1

Your else if needs to be directly after the if. Right now you are saying while { do stuff } elseif { do other stuff }

So try

        if (nextPrime < x) {
            ++x;
        }
        else if {

        }

also if you are using eclipse you can use CTRL-SHIFT-F to format the code (if it has no errors). This can really help sort out nesting issues.

Most importantly you have a ; after the while and the if. A ; indicates that the command will not include {}s, so you want to remove the ;

For example while (1==1); will loop forever.

Answer 2

import java.math.*;

public class FindThePrime {

public static void main(String[] args) {

    int x = 2; 
    int nextPrime =  1;
    for (int i = 1; i <= 10; ++i)
    {
       int count = 0;
       while (nextPrime > x)
       {
         if (nextPrime % x == 0)
         {
            ++nextPrime; 
            x = 2;
            ++count;
          }
          if (nextPrime < x) {
            ++x;
          }   
          else {
              System.out.println("foo");
          }

     } //while loop

    }//for loop
}//main

}