months.java

JAVA 2入门经典 练习答案

//Chapter 4, Exercise 1

public class Months {
  public static void main(String args[]) {
    // Initialize the months' array with names of the months of the year:
    String[] monthNames = {
                           "January"  , "February", "March"   , "April",
                           "May"      , "June"    , "July"    , "August", 
                           "September","October"  , "November", "December"
                         };
                        
    double average = 0.0;           // A variable used to find the average.

    // Declare an array which can contain the 12 random numbers:
    double[] numbers = new double[12];

    // Fill in the numbers' array with 12 numbers between 0.0 and 100.0, and print it out,
    // alongside each month. Also keep track of the sum of those numbers elements.

    for(int i = 0 ; i<numbers.length ; i++) {
      numbers[i] = 100.0*Math.random();
      System.out.println("In Month " + monthNames[i] + " number is " + numbers[i]);
      average += numbers[i];
    }
    average /= numbers.length;

    System.out.println("\nAverage of values in numbers is " + average);
  }
}