# solutions for the second quiz cosc 1306 fall 2104

Post on 18-Dec-2015

232 views

Embed Size (px)

TRANSCRIPT

- Slide 1
- Solutions for the second quiz COSC 1306 Fall 2104
- Slide 2
- First Question What is the difference between a compiled language and an interpreted language? (25 points)
- Slide 3
- Answer What is the difference between a compiled language and an interpreted language? (25 points) A compiled language is translated before execution into binary code that can be directly executed. An interpreted language is interpreted just before and during execution into something executable.
- Slide 4
- Second question The University of Houston stores your names in a last name first followed by a comma and no space format as in Edison,Thomas Alva. Write a Python 3 function adding a space after the comma to and return something like Edison, Thomas Alva, which is more pleasing to the eye. (25 points). (Hint: I would split the string at the comma and rebuild it with the comma and the space.)
- Slide 5
- Answer def student_name(uh_name): lst = uh_name.split(',') return lst[0] + ', ' + lst[1] Space
- Slide 6
- Second question (variant) The University of Houston stores your names in a last name first followed by a comma and no space format as in Edison,Thomas Alva. Write a Python 3 function adding a space after the comma to and return something like Thomas Alva Edison,, which is more pleasing to the eye. (25 points). (Hint: I would split the string at the comma and rebuild it with the space.)
- Slide 7
- Answer def student_name(uh_name) : lst = uh_name.split(',') return lst[1] + ' ' + lst[0]
- Slide 8
- Third question Write a Python function computing restaurant tips. Your function should have as inputs the amount on the check the purchase and the tip rate in percent. In addition, it should assume a default tip rate of 15 percent. For instance, tip(50) should return 7.50 and tip(100, 18) should return 18. (25 points)
- Slide 9
- Answer def tip(bill, rate = 15) : return bill*rate/100
- Slide 10
- Fourth question Consider the following list containing two events, which themselves are lists: sched = [['1030', 'Faculty meeting'] ['1430', 'COSC 1306']] What would be the outcomes of the following Python statements, taken individually? (35 points) sched [0][0] = '1100' sched [0].append('Must attend') sched.pop(0)
- Slide 11
- Answer sched = [['1030', 'Faculty meeting'] ['1430', 'COSC 1306']] sched [0][0] = '1100' [['1100', 'Faculty meeting'] ['1430', 'COSC 1306']] sched [0].append('Must attend') [['1030', 'Faculty meeting', 'Must attend'] ['1430', 'COSC 1306']] sched.pop(0) [['1430', 'COSC 1306']]
- Slide 12
- Fifth question If lst = ['Ann', 'Barbara', 'Charles'], what would be the outcomes of the following Python statements, taken individually? (45 points) lst.pop() lst[0:1] lst[0] lst[:]
- Slide 13
- Answer If lst = ['Ann', 'Barbara', 'Charles'], what would be the outcomes of the following Python statements, taken individually? (45 points) lst.pop() ['Ann', 'Barbara'] lst[0:1] ['Ann'] lst[0] 'Ann' lst[:] ['Ann', 'Barbara', 'Charles']
- Slide 14
- Sixth question Complete the following program to have it compute the sum of all numbers entered. Your program should end once the user has entered a single minus sign and then print the total. (45 points)
- Slide 15
- Sixth question astring =input('Enter a number or a minus to terminate: ') sum = ___ while ___________: sum =___________ ________________ print('Total is ' + str(sum))
- Slide 16
- Answer astring =input('Enter a number or a minus to terminate: ') sum = 0 while astring != '-' : sum =sum + float(astring) astring =input('Enter a number or a minus to terminate: ') print('Total is ' + str(sum))
- Slide 17
- Seventh question Professor Jenkins has to compute her semester averages. Each of her student records consists of a student name followed by the grades she gave for the essays she assigned to her students as in: ['Avarez, Alonzo', 85, 70, 90, 85] Given that all essays have the same weight, what code will she write? (35 points) (Hint: use the sum() and len() methods and handle correctly students who have not turned in any essay.)
- Slide 18
- Seventh question def semester_average(record): ___________________________ if ________ : return ______________ else: return ______________
- Slide 19
- Answer def semester_average(record): essays= record[1:] # eliminate first entry if len(essays) == 0 : return 0 else: return sum(essays)/len(essays)
- Slide 20
- Seventh question (variant) Professor Patel has to compute her semester averages. Each of her student records consists of a student name followed by the grades she gave for the essays she assigned to her students as in: ['Alvarez', 'Alonzo', 85, 70, 90, 85] Given that all essays have the same weight, what code will she write? (35 points) (Hint: use the sum() and len() methods and handle correctly students who have not turned in any essay.)
- Slide 21
- Answer def semester_average(record): essays= record[2:] # eliminate two entries if len(essays) == 0 : return 0 else: return sum(essays)/len(essays)