# DSL - Assignment 2

students=[]
marks=[]
total_students_in=int(input("Total number of students are: \t"))

# Entering marks
def total_students_fn():
	for i in range(total_students_in):
		marks_in=int(input("Enter marks for DSA subject for each student (out of 50) (enter -1 for absent students): \t"))
		marks.append(marks_in)
	print("Marks of", total_students_in, "students in DSA subject are:", marks)

total_students_fn()

# Option 1 = Average
def average_marks():
	for i in marks:
		if i<0:
			break
		else:
			average_calc=sum(marks)/total_students_in
	print("Average score of", total_students_in, "is: \t", average_calc)

# Option 2 = Highest and lowest
def high_low():
   mini=marks[0]
   maxi=marks[0]
   for i in range (len(marks)):
      if (maxi<marks[i] and marks[i]>-1):
         maxi=marks[i]
   for j in range (len(marks)):
      if (mini>marks[j] and marks[j]>-1):
         mini=marks[j]
   print("Highest marks are: \t", maxi)
   print("Lowest marks are: \t", mini)
   
# Option 3 = Absent
def absent():
	absent_count=0
	for i in marks:
		if i==-1:
			absent_count+=1	
	print("Total number of absent students out of", total_students_in, "are: \t", absent_count)

# Option 4 = Highest freq
def high_freq():
   freq_count=0
   for i in range(len(marks)):
      if (i>=0):
         count=0
         for j in range(len(marks)):
            if (marks[i]==marks[j]):
               count+=1
               if (freq_count<count):
                  freq_count=count
      else:
         break
   print("Highest frequency is: \t", freq_count)

# Choosing an option
def choose_optn():
   while True:
      print("Choose an operation to perform:")
      print("1. Average score of all students")
      print("2. Highest and lowest score out of all students")
      print("3. Count of students absent for test")
      print("4. Display marks with highest frequency")
      print("5. Exit")
      optn=int(input("Enter option number (1-5): \t"))
      if optn==1:
         average_marks()
         print("Designed and Engineered by Kshitij")
      elif optn==2:
         high_low()
         print("Designed and Engineered by Kshitij")
      elif optn==3:
         absent()
         print("Designed and Engineered by Kshitij")
      elif optn==4:
         high_freq()
         print("Designed and Engineered by Kshitij")
      elif optn==5:
         print("## Designed and Engineered by Kshitij\n## END OF CODE.")
         quit()
      else:
         print("\n Invalid option selected. Please choose from range 1 to 5. \n")
         choose_optn()

choose_optn()

## END OF CODE