CSCE 110: Programming I
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1 CSCE 110: Programming I Sample Questions for Exam #1 February 17, 2013 Below are sample questions to help you prepare for Exam #1. Make sure you can solve all of these problems by hand. For most of the questions, you can check your answers by typing in the programs and seeing what happens on the computer. 1. Study the following code. 1 x = 1 2 print A 3 if x > 0: 4 print B 5 elif x < 0: 6 print C 7 else : 8 print D 9 print E Listing 1: q1.py a) What is the output of this program? b) What order are the lines executed? c) Suppose line 1 is changed to x = 0. What is the output of the program? 2. Write a program to have the user input (3) numbers: (f)rom, (t)o, (i)ncrement. Count from f to t in increments of i, inclusive of f and t. For example, if the input is f == 2, t == 26, and i == 4, the program would output: 2, 6, 10, 14, 18, 22, For problem #2, if you used a while loop, rewrite your program using a for loop. Otherwise, if you used a for loop, rewrite your program using a while loop. If you didn t use a while or for loop for question #2, then rewrite your program as you must use a loop in order to write your program correctly to handle any combination of f, t, and i entered by the user. 1
2 4. What is the output of the following program? 1 a = " blueberry " 2 print 1:, a [0] 3 print 2:, a [2]*4 4 print 3:, a [1:5] 5 print 4:, a[ -1] 6 print 5:, a [2+3] 7 print 6:, a [2:] Listing 2: q4.py 5. For each variable in the code below, provide its data type. 1 a = True 2 b = "" 3 c = () 4 d = 5 e = 1 6 f = [] 7 g = 1.0 Listing 3: q5.py If necessary, you can use the built-in function type() to help you determine the datatypes of the variables. 6. Consider the following program. Listing 4: q6.py 1 int_ value = int ( raw_ input (" Please enter an integer : ")) # Line A 2 result = 0 3 while int_ value > 0: # Line B 4 if int_ value / 3 > 1: 5 result = result elif int_ value / 3 > 0: 7 result = result else : 9 result = result int_ value = int_ value print " result is", result # Line C 13 print " int_ value is", int_ value # Line D a) List all of the keywords in the program. b) Write the execution order of the lines in this program. Assume that the user types the value 5 at Line A. c) Given a user input of 5, what output is produced by Line C. d) Given a user input of 5, what output is produced by Line D. e) Given a user input of 5, how many times is Line B evaluated. 2
3 7. What is the output of the following program? Listing 5: q7.py 1 for i in range (0,7): 2 if i % 2 == 0: 3 message = Hello 4 else : 5 message = Goodbye 6 print i +1, --, message # comma in print adds a space automatically 8. Consider the following program. Listing 6: q8.py 1 def print_hello (n): 2 print Hello * n 3 4 print_ hello (4) # Line A 5 print_ hello (5-4) # Line B 6 times = 2 7 print_ hello ( times ) # Line C a) What is the output produced by Line A? b) What is the output produced by Line B? c) What is the output produced by Line C? 9. Consider the following program. 1 def product ( nums ): 2 for n in nums : 3 prod = 1 4 prod = prod * n 5 return prod 6 7 print product ([3,5,2]) Listing 7: q9.py a) What is the execution order of the lines in the program? b) What is the output produced by the program? c) The above program is supposed to output the total product of the values in a list. However, there is a logical error in the program. How would you fix the program so that it executes correctly? 3
4 10. What is the output of the following program? Listing 8: q10.py 1 A program that shows a variety of different functions. Remember, when 2 executing the statements in a function, anything after a return statement 3 will not execute def func1 (a): 7 print begin func1 8 b = [10] 9 for i in range (1,a): 10 b += [i *2] 11 return b 12 print end func1 # will not execute ( see comments above ) def func2 (c): 15 print begin func2 16 d = func1 ( c) 17 return d 18 print end func2 # will not execute ( see comments above ) def func3 (): 21 print begin func3 22 x = return x print end func3 # will not execute ( see comments above ) def func4 (e): 27 print begin func4 28 if e > 10: 29 print hey there! 30 else : 31 print func3 () 32 print end func def main (): 35 print begin main 36 x = func1 (2) 37 print x 38 func4 (20) 39 func4 (5) 40 y = func2 (4) 41 print y 42 z = func3 () 43 print z 44 print end main main () 4
5 11. Write the following Python programs. To write these programs, use only what we have discussed in class and the labs. a) Rewrite the program in Question #7 using a while loop instead of a for loop. b) The GCD (greatest common divisor) of two numbers is the largest number that both are di- visible by. For instance, gcd(18, 42) is 6 because the largest number that both 18 and 42 are divisible by is 6. Write a program that asks the user for two numbers and computes their gcd. Shown below is a way to compute the GCD, called Euclid s Algorithm. First compute the remainder of dividing the larger number by the smaller number Next, replace the larger number with the smaller number and the smaller number with the remainder. Repeat this process until the smaller number is 0. The GCD is the last value of the larger number. c) Write a program that asks a user to enter an integer. Now, tell them the number of 4s in their integer. For example, if the user types in the integer , your program will report that the number four appears two times. Make sure when you write your program, your output is easy to read. d) Take the program you wrote in 11(c) and extend it to report back the number of times each of the digits between 0 and 9 appeared in the integer that the user entered. For example, if the user entered , then you would report that the user s number contained three 1s, one 3, two 8s, and two 9s. Make sure your output is easy to read. 5
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