142: Mainline

A fourth virtue of procedure abstraction is that you can augment repetitive computationseasily. For example, in Segment 114, you have seen the movieRating method defined as follows:

public class Movie { 
 // Define movieRating: 
 public static int movieRating (int s, int a, int d) { 
  return s + a + d; 
 } 
} 

You can easily add a line that displays the rating every time that the rating is computed:

public class Movie {
 // Define movieRating:
 public static int movieRating (int s, int a, int d) {
  System.out.print("The rating of the movie is " + (s + a + d)); 
  return s + a + d; 
 } 
} 

Thus, you do not need to bother to find all the places where a rating is computed, because you need to change only the movieRating method's definition.