// Introduction to Software Testing
// Authors: Paul Ammann & Jeff Offutt
// Chapter 1, section 1.2, page 16

class countPositive
{

public static int countPositive (int[] x)
{  //Effects: If x==null throw NullPointerException
   //   else return the number of
   //        positive elements in x.
   int count = 0;

   for (int i=0; i < x.length; i++)
   {
      if (x[i] >= 0)
      {
         count++;
      }
   }
   return count;
}
   // test:  x=[-4, 2, 0, 2]             
   //        Expected = 2

public static void main (String []argv)
{  // Driver method for countPositive
   // Read an array from standard input, call countPositive()
   int []inArr = new int [argv.length];
   if (argv.length == 0)
   {
      System.out.println ("Usage: java countPositive v1 [v2] [v3] ... ");
      return;
   }

   for (int i = 0; i< argv.length; i++)
   {
      try
      {
         inArr [i] = Integer.parseInt (argv[i]);
      }
      catch (NumberFormatException e)
      {
         System.out.println ("Entry must be a integer, using 1.");
         inArr [i] = 1;
      }
   }

   System.out.println ("Number of positive numbers is: " + countPositive (inArr));
}

}