// Fig. 7.21: InitArray.java
// Using command-line arguments to initialize an array.

public class InitArray 
{
   public static void main( String args[] )
   {
      // check number of command-line arguments
      if ( args.length != 3 )
         System.out.println( 
            "Error: Please re-enter the entire command, including\n" + 
            "an array size, initial value and increment." );
      else
      {
         // get array size from first command-line argument
         int arrayLength = Integer.parseInt( args[ 0 ] ); 
         int array[] = new int[ arrayLength ]; // create array

         // get initial value and increment from command-line argument
         int initialValue = Integer.parseInt( args[ 1 ] );
         int increment = Integer.parseInt( args[ 2 ] );

         // calculate value for each array element
         for ( int counter = 0; counter < array.length; counter++ )
            array[ counter ] = initialValue + increment * counter;

         System.out.printf( "%s%8s\n", "Index", "Value" );
         
         // display array index and value
         for ( int counter = 0; counter < array.length; counter++ )
            System.out.printf( "%5d%8d\n", counter, array[ counter ] );
      } // end else
   } // end main
} // end class InitArray


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