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Thread: ';' expected?

  1. #1
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    Default ';' expected?

    ';' expected comes out when i compile, what's the problem with my while loop?
    btw..i know this is not the best solution for making a program find out if it is a prime or not..
    public class primenumberstesting2 {
    	public static void main(String[]args){
    		int num;
                          do{
                            }
    			while(num >=0){	
    			System.out.println("Enter a positive integral value: ");
    			 num = Keyboard.readInt();
     
    			 int isPrime=0;
     
            for(int num1=1;num1<=100;num1++)
                {
                    isPrime=0;
                    for(int num2=1;num2<num1;num2++) 
                        {
                            if(((num1%num2)==0) & num2!=1)
                            {
                               isPrime=1; 
                            }
                        }
                        if(isPrime==0)
                        {
                            System.out.println("Input is a prime number");
    					}else
    						System.out.println("Input is a non-prime number");
    			}
    					}
     
    		}
    	}
    Last edited by helloworld922; November 18th, 2009 at 06:31 PM.


  2. #2
    Super Moderator Json's Avatar
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    Default Re: ';' expected?

    This is because you have your do while statement wrong.

    This is what it should look like but you've got an extra { after the while() bit.

    do {
     // statement
    } while(condition);

    // Json
    Last edited by Json; November 19th, 2009 at 02:37 AM. Reason: Condition instead of statement, statement instead of logic :)

  3. #3
    Super Moderator helloworld922's Avatar
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    Default Re: ';' expected?

    I think you meant this:

    do
    {
        // statements
    } while (condition);
    Last edited by helloworld922; November 21st, 2009 at 01:11 PM.

  4. #4
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    Default Re: ';' expected?

    i placed that do because ..there's another error if i wont have it...something likE.... "num wont be able to initiallize"

  5. #5
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    Default Re: ';' expected?

    Quote Originally Posted by noobish View Post
    i placed that do because ..there's another error if i wont have it...something likE.... "num wont be able to initiallize"
    You need to initialize the num variable to something before you enter the loop, something like
    int num = 0;
    do....
    while...

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