rectanglearea.java

《A first book of java》by Gary J.Bronson 北大出版社

// this program calculates the area of a rectangle
// given its length and width
public class RectangleArea
{
  public static void main(String[] args)
  {
    double length, width, area;
    length = 27.3;                           
    width = 13.4;
    area = length * width;
    System.out.println("The length of the rectangle is " + length);
    System.out.println("The width of the rectangle is " + width);
    System.out.println("The area of the rectangle is " + area);
  }
}