#	program4: Grade Computer
#
#	This program solicits the user to enter a student name,
#	and then the numeric scores for the student's exams, homework,
#	and projects. It reports the student's name, total points, and letter
#	grade, and then solicits another name. When the user enters "quit"
#	the program reports the class average and average grade.
#
#	Program written by Severus Snape
#	19 November 2011
#
#######################################################


#	getPoints is a generic function for obtaining the scores for 
#	a category of graded work and computing the percentage
#	points earned. 
#
#	Arguments are: student (student name),
#		count (the number of instances of the work)
#		category (the name of the category, such as "exam")
#		value (the number of percentage points possible)
#		scoreRange (the maximum score possible for each instance)

def getPoints (student, count, category, value, scoreRange):
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for " + \
			category + " " + str(i) + " >>> ")
		points = points + score
	
	percent = points * value / (count *  scoreRange)
	
	return percent
	
# end of function getPoints	
	

#	function computeGrade is given a score and returns the 
#	letter grade that corresponds to that score.

def computeGrade ( score ):
	
	if score < 60:
		grade = "F"
	elif score < 70:
		grade = "D"
	elif score < 80:
		grade = "C"
	elif score < 90:
		grade = "B"
	else:
		grade = "A"	
		
	return grade

# end of function computeGrade


def main ( ):
	classTotal = 0.0
	studentCount = 0

	reportBody = "\n\nStudent\tScore\tGrade\n=====================\n" 
        
	studentName = raw_input ("Enter the next student's name, 'quit' when done >>> ")
        
	while studentName != "quit":       
		studentCount = studentCount + 1

		examPoints = getPoints( studentName, 4, "exam", 50, 200 )
		homeworkPoints = getPoints ( studentName, 5, "homework", 10, 10 )
		projectPoints = getPoints ( studentName, 3, "project", 40, 100 )

		studentScore = examPoints + homeworkPoints + projectPoints
		studentGrade = computeGrade (studentScore)
		
		reportBody = reportBody + studentName + ":\t" + \
			str(studentScore) + "\t"+ studentGrade + "\n" 
		classTotal = classTotal + studentScore
       
		studentName = raw_input (  \
			"Enter the next student's name, 'quit' when done >>> ")
	# end while

 	if studentCount > 0:
		classAverage = int ( round (classTotal/studentCount) )
 		classAvgGrade = computeGrade ( classAverage )
 		print reportBody       
		print  "Average class score: " , classAverage, \
			"\nAverage class grade: ", classAvgGrade
	else:
		print "No data to report"
	        
main ( ) # launch program