Chapter 6-Functions

3 -1

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)

3 3

What will be displayed by the following code? def f1(x = 1, y = 2): x = x + y y += 1 print(x, y) f1()

3 1

What will be displayed by the following code? x = 1 def f1(): x = 3 print(x) f1() print(x)

may have no parameters

A function ________.

None

A function with no return statement returns _____.

parentheses

Arguments to functions always appear within ________.

a stack

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 stub

__________ is a simple but incomplete version of a function.

Top-down approach

__________ is to implement one function in the structure chart at a time from the top to the bottom.

2

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)

global variables

Whenever possible, you should avoid using __________.

a local variable

A variable defined inside a function is referred to as __________.

a global variable

A variable defined outside a function is referred to as _______.

return number

Consider the following incomplete code: def f(number): # Missing function body print(f(5)) The missing function body should be ________.

No

Does the function call in the following function cause syntax errors? import math def main(): math.sin(math.pi) main()

2

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")

aaaa

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)?

infinite loop

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)?

f(1, 2, 3, 4) f(p1 = 1, p2 = 2, p3 = 3, p4 = 4) f(1, 2, 3, p4 = 4)

Given the following function header: def f(p1, p2, p3, p4) Which of the following is correct to invoke it?

None

If a function does not return a value, by default, it returns ________.

function name and parameter list

The header of a function consists of _________.

3 2

What will be displayed by the following code? def f1(x = 1, y = 2): x = x + y y += 1 print(x, y) f1(2, 1)

3 3

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)

3 3

What will be displayed by the following code? x = 1 def f1(): global x x = x + 2 print(x) f1() print(x)

The program has a runtime error because x is not defined.

What will be displayed by the following code? x = 1 def f1(): x = x + 2 print(x) f1() print(x)

3 1

What will be displayed by the following code? x = 1 def f1(): y = x + 2 print(y) f1() print(x)

pass by value

When you invoke a function with a parameter, the value of the argument is passed to the parameter. This is referred to as _________.

def f(a = 1, b = 1, c = 2):

Which of the following function headers is correct?

Write a function that prints integers from 1 to 100.

Which of the following should be defined as a None function?