Computing the Average

Of course, this is assuming that there are more than zero elements. Dividing by zero causes a run-time error. Here is the program with some additional statements for computing the average of the elements:

class SumArray
{

  public static void main ( String[] args ) 
  {
    double[] array =  { -47.39, 24.96, -1.02, 3.45, 14.21, 32.6, 19.42 } ;

    // declare and initialize the total
    double  total = 0.0 ;

    // add each element of the array to the total
    for ( int index=0; index < array.length; index++ )
    { 
      total =  total + array[ index ] ;

    }

    if ( array.length  0 )
    {
      System.out.println("The total is:   " + total );
      System.out.println("The average is: " + total /   );
    }      
    else
      System.out.println("The array contains no elements." );
    
  }
}

It might look a little strange to test if array contains any elements, since it is obvious that it does. However, in a more realistic program the array will come from some external source, and sometimes the array will have length zero.

Answer:

Computing the Average

QUESTION 15: