#	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 reporst 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
#	12 November 2006


#	function getExamPoints is given the name of a student and the
#	number of exams that are given. It solicits the scores for the student's
#	exams and computes and returns the exam points for the student.
# 
#	each exam is 200 points, and exams count for 50% of the total grade

def getExamPoints (student, count)
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for exam " + str(i) )
		points == points + score
	
	examPercent = (points / (count * 200) ) * 50
	
	return examPercent
	
#	function getHomeworkPoints is given the name of a student and the
#	number of homework assignments that are given. It solicits the scores for 
#	the student's assignments and computes and returns the homework
#	 points for the student.
# 
#	each homework is 10 points, and altogether homework is 10% of the total grade
	
def getHomeworkPoints (student, count):
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for homework " + str(i) )
		points = points + score
	
	homeworkPercent = points / count
	
	return homeworkPercent


#	function getProjectPoints is given the name of a student and the
#	number of project assignments that are given. It solicits the scores for 
#	the student's projects and computes and returns the project
#	 points for the student.
# 
#	each project is 100 points, and projects count for 40% of the total grade
	
def getProjectPoints (student, count):
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for project " + str(i) )
		points = points + score
	
	projectPercent = (points  * 40/ (count * 100)) 
	

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

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

#	function computeClassGrades
#
#	This function computes the final scores and grades for each student,
#	reporting each student's name, score, and grade. It also maintains
#	a total for the class. When the last student's grade has been computed, 
#	this function returns the average for the class.

def computeClassGrades ( classGrade ):

	classTotal = 0.0
	studentcount = 0
        
	studentName = raw_input ("Enter the next student's name, 'quit' when done")
        
	while studentName != "quit":
        
		studentCount = studentCount + 1
            
		examPoints = getExamPoints( studentName, 4)
		homeworkPoints = getHomeworkPoints ( studentName, 5 )
		projectPoints = getProjectPoints ( studentName, 3 )
		
		studentScore = examPoints + homeworkPoints + projectPoints
		
		classTotal = classTotal + studentScore      # accumulate total for the class
		
		studentGrade = computeGrade (studentScore)
		
            	print studentName, ":\t", studentScore, "\t", studentGrade 
            
            	studentName = input ("Enter the next student's name, 'quit' when done")
       
       	return classTotal / studentCount	# return the average


def main ( ):

	classAverage = 0.0		# initialize averages
	classAvgGrade = "C"
        
	# print column headers
    
	print "Student\tScore\tGrade\n" 
        
	classAverage =  computeClassGrades ( )
        
	# round class average
        
	classAverage = int ( round(classAverage ))
        
	classAvgGrade = computeGrade ( classAverage )
        
	print  "Average class score: " , classAverage, "\nAverage class grade: ", classAvgGrade 
	        
main ( ) # end of main