Solutions for the second quiz COSC 1306 Fall 2104

First Question What is the difference between a compiled language and an interpreted language? (2×5 points)

Answer What is the difference between a compiled language and an interpreted language? (2×5 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.

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. (2×5 points). (Hint: I would split the string at the comma and rebuild it with the comma and the space.)

Answer def student_name(uh_name): lst = uh_name.split(',') return lst[0] + ', ' + lst[1] Space

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. (2×5 points). (Hint: I would split the string at the comma and rebuild it with the space.)

Answer def student_name(uh_name) : lst = uh_name.split(',') return lst[1] + ' ' + lst[0]

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. (2×5 points)

Answer def tip(bill, rate = 15) : return bill*rate/100

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? (3×5 points)  sched [0][0] = '1100'  sched [0].append('Must attend')  sched.pop(0)

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']]

Fifth question If lst = ['Ann', 'Barbara', 'Charles'], what would be the outcomes of the following Python statements, taken individually? (4×5 points)  lst.pop()  lst[0:1]  lst[0]  lst[:]

Answer If lst = ['Ann', 'Barbara', 'Charles'], what would be the outcomes of the following Python statements, taken individually? (4×5 points)  lst.pop() ['Ann', 'Barbara']  lst[0:1] ['Ann']  lst[0] 'Ann'  lst[:] ['Ann', 'Barbara', 'Charles']

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. (4×5 points)

Sixth question astring =input('Enter a number or a minus to terminate: ') sum = ___ while ___________: sum =___________ ________________ print('Total is ' + str(sum))

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))

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? (3×5 points) (Hint: use the sum() and len() methods and handle correctly students who have not turned in any essay.)

Seventh question def semester_average(record): ___________________________ if ________ : return ______________ else: return ______________

Answer def semester_average(record): essays= record[1:] # eliminate first entry if len(essays) == 0 : return 0 else: return sum(essays)/len(essays)

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? (3×5 points) (Hint: use the sum() and len() methods and handle correctly students who have not turned in any essay.)

Answer def semester_average(record): essays= record[2:] # eliminate two entries if len(essays) == 0 : return 0 else: return sum(essays)/len(essays)