// Fig. 2.20: Comparison.java
// Compare integers using if structures, relational operators
// and equality operators.

// Java extension packages
import javax.swing.JOptionPane;

public class Grades {
	 // main method begins execution of Java application
	 public static void main( String args[] )
	 {
	 	int total, 		// sum of grades input by user
		gradeCounter, 	// number of grades entered
		gradeValue, 	// grade value
		average; 		// average of all grades
		String grade; 	// grade typed by user

	 // Initialization Phase
		total = 0; // clear total
		gradeCounter = 1; // prepare to loop

		// Processing Phase
		while ( gradeCounter <= 10 ) { // loop 10 times

		// prompt for input and read grade from user
		grade = JOptionPane.showInputDialog(
		"Enter integer grade: " );

		// convert grade from a String to an integer
		gradeValue = Integer.parseInt( grade );

		// add gradeValue to total
		total = total + gradeValue;

		// add 1 to gradeCounter
		gradeCounter = gradeCounter + 1;

		} // end while structure

		// Termination Phase
		average = total / 10; // perform integer division

		// display average of exam grades
		 JOptionPane.showMessageDialog( null,
		"Class average is " + average, "Class Average",
		JOptionPane.INFORMATION_MESSAGE );

		System.exit( 0 ); // terminate the program

 		} // end method main

 } // end class Average1