i = 0
aveCOU = 0
aveEXA = 0
aveAGG = 0
studentDATA=[]
userOPTION = ""
print("Student Marks Program")
print()
while userOPTION != "x":
    print("a. Add new student records ")
    print("b. Show all student records ")
    print("c. Delete a student record ")
    print("d. Display overall average coursework mark ")
    print("e. Display overall average exam mark ")
    print("f. Display all aggregate marks ")
    print("g. Display overall average aggregate mark ")
    print("x. Exit ")
    print()
    userOPTION = input("Enter option: ")
    print()

    if userOPTION == "a":
        a = 0
        a = int(input("How many to add? "))
        while i != a:
            name = input("Enter a name: ")
            cwMark = input("Enter a coursework mark: ")
            eMark = input("Enter an exam mark: ")
            student = [name,cwMark,eMark]
            studentDATA.append(student)
            i += 1
        userOPTION = ""
        print()
        i = 0

    elif userOPTION == "b":
        while i < len(studentDATA):
            print("Name:",studentDATA[i][0])
            print("Coursework mark:", studentDATA[i][1])
            print("Exam mark:", studentDATA[i][2])
            print()
            i += 1
        userOPTION = ""