Average

1/******************************************************************************2 *  Compilation:  javac Average.java3 *  Execution:    java Average < data.txt4 *  Dependencies: StdIn.java StdOut.java5 *  6 *  Reads in a sequence of real numbers, and computes their average.7 *8 *  % java Average9 *  10.0 5.0 6.010 *  3.0 7.0 32.011 *  [Ctrl-d]12 *  Average is 10.513 *14 *  Note [Ctrl-d] signifies the end of file on Unix.15 *  On windows use [Ctrl-z].16 *17 ******************************************************************************/18 19/**20 *  The {@code Average} class provides a client for reading in a sequence21 *  of real numbers and printing out their average.22 *  <p>23 *  For additional documentation, see <a href="https://algs4.cs.princeton.edu/11model">Section 1.1</a> of24 *  <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne.25 *26 *  @author Robert Sedgewick27 *  @author Kevin Wayne28 */29public class Average { 30 31    // this class should not be instantiated32    private Average() { }33 34    /**35     * Reads in a sequence of real numbers from standard input and prints36     * out their average to standard output.37     *38     * @param args the command-line arguments39     */40    public static void main(String[] args) { 41        int count = 0;       // number input values42        double sum = 0.0;    // sum of input values43 44        // read data and compute statistics45        while (!StdIn.isEmpty()) {46            double value = StdIn.readDouble();47            sum += value;48            count++;49        }50 51        // compute the average52        double average = sum / count;53 54        // print results55        StdOut.println("Average is " + average);56    }57}58