Programming Function Calls Quiz

Exam 3 Sample Questions

• Sample questions similar to those on the exam are provided.
• These questions are not exhaustive, and other topics may appear on the exam.
• Use this document as supplemental study material.

Question 1: Function Call

• Problem: Determine the returned value from a function call.
• Function: mystery(x, y, z)
  • Takes three arguments x, y, and z
  • If x > 0, then:
    • If y < z, return x
    • Otherwise, return y + z
  • Otherwise, return y
• Values: a = 3, b = 4, c = -2
• Call: mystery(a, b, c)
• Solution: The code returns 3 because a is 3, a > 0is true, and b is 4, and c is -2, and 4 > -2 is true, so a = 3 is returned from the function

Question 2: Return Values

• Problem: Identify function calls that return a value of 10.
• Function: mystery(a, b, c)
  • If a > b, then:
    • If b < c, return a + c
    • Otherwise, return b + c
  • Otherwise, return a + b

Question 3: Files

• Problem: Identify the correct code for opening a file for reading only.
• Solution: fn = open("test_answers.txt", 'r')

Question 4: Files – next() Function

• Problem: Describe the function of the next() function in file reading.
• Solution: The next() function skips to the next line in the file, useful for skipping headers.

Question 5: Dictionaries

• Problem: Define a dictionary.
• Solution: A dictionary stores data in key-value pairs.

Question 6: Tracing Code

• Problem: Determine the output from a given code segment.
• Code: Defines functions sparty and wolvy
  • sparty prints "Go green!" if its input (n) is even, and "Go white!" if odd
  • wolvy returns its input multiplied by "Boo blue"
  • Code loops for 5 iterations
• Output: The output shows a repeating pattern of "Go white!" and "Go green!" interspersed with "Boo blue"

Question 7: CSV Unpacking

• Problem: Identify the issue within a CSV file reading program.
• Solution: The data from the CSV reader isn't unpacked correctly.

Question 8: File Data

• Problem: Determine the type of the data read from a CSV file using csv.reader().
• Solution: The data type is dependent on the data. Numbers are floats or integers, otherwise they're strings

Question 9: Dictionaries – Method for Iteration

• Problem: Identify the dictionary method used for iterating over both keys and values.
• Solution: items()

Question 10: Function Terms

• Problem: Identify the term for values passed into a function.
• Solution: Arguments

Question 11: Dictionaries – Invalid Keys

• Problem: Determine which data type cannot be used as a key in a dictionary.
• Solution: Lists

Question 12: Functions – Output

• Problem: Determine the output from a given function.
• Solution: The function prints messages about opening and closing, and it returns the value assigned to the variable "check" within the function.

Question 13: Dictionaries – Key Iteration

• Problem: Identify options for iterating through dictionary keys.
• Methods: dictionary.keys(), for key in dictionary:

Question 14: Files – Data Type

• Problem: Determine the required data type for writing to a text file.
• Solution: String

Question 15: Dictionaries – Value Update

• Problem: Identify options that update the values in a dictionary.
• Solution: Iterating over the keys (dictionary.keys()) and updating the values using the key as index, for example dictionary[‘key’] = {value}.

Answer Key

• Numerical answers to the corresponding question are provided.

Test your understanding of function calls and return values with this exam sample. The questions focus on conditional logic in function definitions and help you prepare for your upcoming exam. Use this supplement as a part of your study strategy.