Listing 7. Source code for the program named Alice0175f.

Alice0175f's Code Created by: Dick Baldwin world Events When the world starts Do: world.main ( ); Methods   public void main ( ) {     Number grade = 0 ; Number sum = 0 ; Number count = 0 ; Number avg = 0 ;        // Copyright 2007, R.G.Baldwin   // Illustrates sentinel loop.   // Do a priming read.   grade .set( value , ( NumberDialog( question = Enter next grade or -1 ) ) );   while ( ( grade >= 0 ) ) {        // Update the sum.   sum .set( value , ( ( sum + grade ) ) );   // Get next grade and increment the counter.   grade .set( value , ( NumberDialog( question = Enter next grade or -1 ) ) );   count ++   }   // Compute and display average grade.   avg .set( value , ( ( sum / count ) ) );   ground .say( ( Average grade = + ( avg .toString() ) ) ); duration = 5 seconds   }