Introduction to Programming Using Python, Y. Daniel Liang

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Chapter 6 Functions

Sections 6.2 Defining a Function
6.1  If a function does not return a value, by default, it returns ___________.
A. None
B. int
C. double
D. public
E. null

6.2  The header of a function consists of ____________.
A. function name
B. function name and parameter list
C. parameter list

6.3  A function _________.
A. must have at least one parameter
B. may have no parameters
C. must always have a return statement to return a value
D. must always have a return statement to return multiple values

Sections 6.3 Calling a Function
6.4  Arguments to functions always appear within __________.
A. brackets
B. parentheses
C. curly braces
D. quotation marks

6.5  Does the function call in the following function cause syntax errors?

import math
def main():
    math.sin(math.pi)

main()
A. Yes
B. No

6.6  Each time a function is invoked, the system stores parameters and local variables in an area of memory, known as _______, which stores elements in last-in first-out fashion.
A. a heap
B. storage area
C. a stack
D. an array

Sections 6.4 Functions With/Without Return Values
6.7  Which of the following should be defined as a None function?
A. Write a function that prints integers from 1 to 100.
B. Write a function that returns a random integer from 1 to 100.
C. Write a function that checks whether a number is from 1 to 100.
D. Write a function that converts an uppercase letter to lowercase.

6.8  A function with no return statement returns ______.
A. void
B. nothing
C. 0
D. None

6.9  Consider the following incomplete code:

def f(number):
  # Missing function body

print(f(5))

The missing function body should be ________.
A. return "number"
B. print(number)
C. print("number")
D. return number

Sections 6.5 Positional and Keyword Arguments
6.10  Given the following function header:

def f(p1, p2, p3, p4)

Which of the following is correct to invoke it?
A. f(1, 2, 3, 4)
B. f(p1 = 1, 2, 3, 4)
C. f(p1 = 1, p2 = 2, p3 = 3, 4)
D. f(p1 = 1, p2 = 2, p3 = 3, p4 = 4)
E. f(1, 2, 3, p4 = 4)

6.11  Given the following function

def nPrint(message, n):
    while n > 0:
        print(message)
        n -= 1

What will be displayed by the call nPrint('a'4)?

A. aaaaa
B. aaaa
C. aaa
D. invalid call
E. infinite loop

6.12  Given the following function

def nPrint(message, n):
    while n > 0:
        print(message)
    n -= 1

What will be displayed by the call nPrint('a'4)?
A. aaaaa
B. aaaa
C. aaa
D. invalid call
E. infinite loop

6.13  Given the following function

def nPrint(message, n):
    while n > 0:
        print(message)
        n -= 1

What is k after invoking nPrint("A message", k)?

k = 2
nPrint("A message", k)
A. 0
B. 1
C. 2
D. 3

6.14  Given the following function

def nPrint(message, n):
    while n > 0:
        print(message)
        n -= 1

What is k after invoking nPrint("A message", k)?

k = 2
nPrint(n = k, message = "A message")
A. 0
B. 1
C. 2
D. 3

Sections 6.6 Passing Parameters by Values
6.15  When you invoke a function with a parameter, the value of the argument is passed to the parameter. This is referred to as _________.
A. function invocation
B. pass by value
C. pass by reference
D. pass by name

Section 6.9 The Scope of Variables
6.16  A variable defined inside a function is referred to as __________.
A. a global variable
B. a function variable
C. a block variable
D. a local variable

6.17  A variable defined outside a function is referred to as __________.
A. a global variable
B. a function variable
C. a block variable
D. a local variable

6.18  Whenever possible, you should avoid using __________.
A. global variables
B. function parameters
C. global constants
D. local variables

6.19  What will be displayed by the following code?

x = 1
def f1():
    y = x + 2
    print(y)

f1()
print(x)
A. 1 3
B. 3 1
C. The program has a runtime error because x is not defined.
D. 1 1
E. 3 3

6.20  What will be displayed by the following code?

x = 1
def f1():
    x = 3
    print(x)

f1()
print(x) 
A. 1 3
B. 3 1
C. The program has a runtime error because x is not defined.
D. 1 1
E. 3 3

6.21  What will be displayed by the following code?

x = 1
def f1():
    x = x + 2
    print(x)

f1()
print(x)
A. 1 3
B. 3 1
C. The program has a runtime error because x is not defined.
D. 1 1
E. 3 3

6.22  What will be displayed by the following code?

x = 1
def f1():
    global x
    x = x + 2
    print(x)

f1()
print(x) 
A. 1 3
B. 3 1
C. The program has a runtime error because x is not defined.
D. 1 1
E. 3 3

Section 6.10 Default Arguments
6.23  What will be displayed by the following code?

def f1(x = 1, y = 2):
    x = x + y
    y += 1
    print(x, y)

f1()
A. 1 3
B. 3 1
C. The program has a runtime error because x and y are not defined.
D. 1 1
E. 3 3

6.24  What will be displayed by the following code?

def f1(x = 1, y = 2):
    x = x + y
    y += 1
    print(x, y)

f1(21)
A. 1 3
B. 2 3
C. The program has a runtime error because x and y are not defined.
D. 3 2
E. 3 3

6.25  What will be displayed by the following code?

def f1(x = 1, y = 2):
    x = x + y
    y += 1
    print(x, y)

f1(y = 2, x = 1)
A. 1 3
B. 2 3
C. The program has a runtime error because x and y are not defined.
D. 3 2
E. 3 3

6.26  Which of the following function headers is correct?
A. def f(a = 1, b):
B. def f(a = 1, b, c = 2):
C. def f(a = 1, b = 1, c = 2):
D. def f(a = 1, b = 1, c = 2, d):

Section 6.11 Returning Multiple Values
6.27  What will be displayed by the following code?

def f1(x = 1, y = 2):
    return x + y, x - y

x, y = f1(y = 2, x = 1)
print(x, y)
A. 1 3
B. 3 1
C. The program has a runtime error because the function returns the multiple values
D. 3 -1
E. -1 3

Section 6.13 Function Abstraction and Stepwise Refinement
6.28  __________ is to implement one function in the structure chart at a time from the top to the bottom.
A. Bottom-up approach
B. Top-down approach
C. Bottom-up and top-down approach
D. Stepwise refinement

6.29  __________ is a simple but incomplete version of a function.
A. A stub
B. A function
C. A function developed using botton-up approach
D. A function developed using top-down approach