import javax.swing.JOptionPane;

public class ScienceStudent{
	final double SCIENCE_MIDTERM_PERCENTAGE = .40;
	final double SCIENCE_FINALEXAM_PERCENTAGE = .40;
	final double SCIENCE_RESEARCH_PERCENTAGE = .20;
	
	int midterm = 0;
	int finalExam = 0;
	int research = 0;
	int presentation = 0;
	double finalNumericGrade = 0;
	String finalLetterGrade = "";
	
	public ScienceStudent()
	{
		System.out.println("ScienceStudent's constructor");
	}
	
	public void calculate()
	{
		midterm = Integer.parseInt(JOptionPane.showInputDialog("Enter the midterm grade:"));
		finalExam = Integer.parseInt(JOptionPane.showInputDialog("Enter the final exam grade:"));
		research = Integer.parseInt(JOptionPane.showInputDialog("Enter the research grade:"));
								
		finalNumericGrade = (midterm*SCIENCE_MIDTERM_PERCENTAGE)+(finalExam*SCIENCE_FINALEXAM_PERCENTAGE)+
																		(research*SCIENCE_RESEARCH_PERCENTAGE);
								
		if (finalNumericGrade >= 90)
			finalLetterGrade = "A";
		else
		if((finalNumericGrade >=80)&(finalNumericGrade < 90))
			finalLetterGrade = "B";
		else
		if((finalNumericGrade >=70) & (finalNumericGrade < 80))
			finalLetterGrade = "C";
		else
		if((finalNumericGrade >= 60)&(finalNumericGrade < 70))
			finalLetterGrade = "D";
		else
			finalLetterGrade = "F";	
	}	
}