when i run my virtual machine just keeps going, but no output.

[nathan gibson]

 import java.util.Scanner;
import java.util.Random;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.File;
public class BottleCapPrize
{
    public static void main(String [] args)throws IOException 
    {
        Scanner in; 
        in = new Scanner(System.in);
       
       
        int numTrials = 10;
        int average = 0;
       
        PrintWriter outFile = new PrintWriter (new File("bottleCap.txt"));
 
      
  
      for (int i = 0; i < numTrials; i++)
  
      {
  
      int counter = 0;
  
      int randomNumber = 0;
 
      
 
      do
 
      {
 
      randomNumber = ((int)(0+ Math.random()* 5));
 
      counter++;
 
      }
 
      while (randomNumber != 1);
 
      
 
      outFile.println(counter);
 
      }
 
      
 
        outFile.close ( );
       
        
        File fileName = new File("bottleCap.txt");
        Scanner inFile = new Scanner("bottleCap.txt");
        
       
        int counter = 0;
        String data = "";
       
        while (inFile.hasNext())
        {
            data = inFile.next ( );
            int num = in.nextInt();
            int sum = num + num;
            average = num/numTrials;
            
         }    
    
    System.out.println(average); 
        
       
       
        inFile.close(); 
      
                  
                 

             
          
        }
     }   

does anyone know what my problem is?/how to fix it?

[Henry Wong]

when i run my virtual machine just keeps going, but no output.

Well, to have output, you actually need to generate output. Your code doesn't seem to do that. In fact, it doesn't even prompt the user when taking input -- it just fetches the input.

My guess is that your program is stuck waiting for more input from the user...

Henry

[Paul Clapham]

Your problem is that you don't have enough lines of code which produce output. Add some more of them and you'll be able to see what your program is doing and thus figure out how to change it. Example of code you should add:

System.out.println("Random number just produced was " + random);

[nathan gibson]

  int counter = 0;
        String data = "";
       
        while (inFile.hasNext())
        {
            data = inFile.next ( );
            int num = in.nextInt();
            int sum = num + num;
            average = num/numTrials;
            
         }    
    
    
        
       
       inFile.close(); 
       System.out.println(average); 
      
                  
                 

               

it still does it

[Henry Wong]

As already mentioned... My guess is that your program is stuck waiting for more input from the user. You have an infinite loop waiting for input.

Or are you now saying that you removed all that stuff?

Henry

[nathan gibson]

Henry Wong wrote:As already mentioned... My guess is that your program is stuck waiting for more input from the user. You have an infinite loop waiting for input.

Or are you now saying that you removed all that stuff?

Henry

it doesnt ask for user input, does it? if it does please point out my error.

[Henry Wong]

Can you post the complete code? I can't tell what you are doing.

[EDIT: never mind. can you post the complete code? I am totally confused at the moment.]

Henry

[nathan gibson]

Henry Wong wrote:Can you post the complete code? I can't tell what you are doing.

[EDIT: never mind. can you post the complete code? I am totally confused at the moment.]

Henry

i changed it to == and it still did the same thing. do you know anything else it could be?

[nathan gibson]

Henry Wong wrote:Can you post the complete code? I can't tell what you are doing.

[EDIT: never mind. can you post the complete code? I am totally confused at the moment.]

Henry

 import java.util.Scanner;
import java.util.Random;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.File;
public class BottleCapPrize
{
    public static void main(String [] args)throws IOException 
    {
        Scanner in; 
        in = new Scanner(System.in);
       
       
        int numTrials = 10;
        int average = 0;
       
        PrintWriter outFile = new PrintWriter (new File("bottleCap.txt"));
 
      
  
      for (int i = 0; i < numTrials; i++)
  
      {
  
      int counter = 0;
  
      int randomNumber = 0;
 
      
 
      do
 
      {
 
      randomNumber = ((int)(0+ Math.random()* 5));
 
      counter++;
 
      }
 
      while (randomNumber != 1);
 
      
 
      outFile.println(counter);
 
      }
 
      
 
        outFile.close ( );
       
        
        File fileName = new File("bottleCap.txt");
        Scanner inFile = new Scanner("bottleCap.txt");
        
       
        int counter = 0;
        String data = "";
       
        while (inFile.hasNext())
        {
            data = inFile.next ( );
            int num = in.nextInt();
            int sum = num + num;
            average = num/numTrials;
            
            
         }    
    
    
        
       
       inFile.close(); 
       System.out.println(average); 
       
      
                  
                 

             
          
        }
     }
   

[Henry Wong]

nathan gibson wrote:
it doesnt ask for user input, does it? if it does please point out my error.

I knew I wasn't going crazy. I swore I saw it... it asks for user input here...

while (inFile.hasNext())   
{   
       data = inFile.next ( );   
       int num = in.nextInt();       // <------ HERE   
       int sum = num + num;   
       average = num/numTrials;   
}      

The "in" variable is a scanner object that is reading from System.in, hence, the code is waiting here for the user to type in an integer.

Henry

[nathan gibson]

haha. alright, i know this is a noob question, but what do i change it to?

[Henry Wong]

nathan gibson wrote:haha. alright, i know this is a noob question, but what do i change it to?

It's your program. If you don't know what is it supposed to do, how do you expect us to know?

Henry

[nathan gibson]

Henry Wong wrote:

nathan gibson wrote:haha. alright, i know this is a noob question, but what do i change it to?

It's your program. If you don't know what is it supposed to do, how do you expect us to know?

Henry

im sorry, its just im very close to finishing this. i have been working on it for days. thank you for your patience.
i have updated my code to this:

           File fileName = new File("bottleCap.txt");
        Scanner inFile = new Scanner("bottleCap.txt");
        
       
        int counter = 0;
        String data = "";
       
        while (inFile.hasNextInt())
        {
            data = inFile.next ( );
            int num = inFile.nextInt ();
            int sum = num + num;
            average = sum/numTrials;
            
            
         }    
    
    
        
       
       inFile.close(); 
       System.out.println(average); 
       
      
                   }
     } 

it will run now, but i cant get my output to work correctly. i think my problem is that i dont know how to calculate the sum of the numbers, can you show me?

[nathan gibson]

i got it this far. now it is def the way i am doing my sum. i get a number for sum, just not correct.

  import java.util.Scanner;
import java.util.Random;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.File;
public class BottleCapPrize
{
    public static void main(String [] args)throws IOException 
    {
        Scanner in; 
        in = new Scanner(System.in);
       
       
        int numTrials = 1000;
        
       
        PrintWriter outFile = new PrintWriter (new File("bottleCap.txt"));
 
      
  
      for (int i = 0; i < numTrials; i++)
  
      {
  
      int counter = 0;
  
      int randomNumber = 0;
 
      
 
      do
 
      {
 
      randomNumber = ((int)(0+ Math.random()* 5));
 
      counter++;
 
      }
 
      while (randomNumber != 1);
 
      
 
      outFile.println(counter);
 
      }
 
      
 
        outFile.close ( );
       
        
       Scanner inFile = new Scanner(new File("bottleCap.txt"));
        
        int num = 0;
        int sum = 0;
        double average = 0;
        String data = "";
        
       
        while (inFile.hasNextInt())
        {
            data = inFile.next( );
            num = inFile.nextInt ();
            sum = + num;
            
         }    
            
    
       average = sum/numTrials;
       System.out.println(average); 
       inFile.close(); 
         
       
      
                   }
     }
  

[Janeice DelVecchio]

while (inFile.hasNextInt())
{
data = inFile.next( );
num = inFile.nextInt ();
// try putting a System.out.println(num); here
sum = + num;
// and a System.out.println(sum + " " + num); here......... this way you might be able to see why it's not coming out right......

}

My $0.02,
Janeice

[nathan gibson]

lol += is what i needed. i found it out.