Chapter 2 checkpoint questions Flashcards
What is a software requirement?
A single function that the program must perform in order to satisfy the customer
What is an algorithm?
A set of well-defined logical steps that must be taken to perform a task
What is pseudocode?
An informal language that has no syntax rules and is not meant to be compiled or executed. Instead, programmers use pseudocode to create models, or “mock-ups”, of programs.
What is a flowchart?
A diagram that graphically depicts the steps that take place in a program
What does the oval symbol mean in a flowchart?
Ovals are terminal symbols.
What does the parallellogram symbol mean in a flowchart?
Parallellograms are either output or input symbols.
What does the rectangle symbol mean in a flowchart?
Rectangles are processing symbols.
Write a statement that displays your name
print(“The name”)
Write a statement that displays the following text:
Python’s the best!
print(“Python’s the best!”)
Write a statement that displays the following text:
The cat said “meow.”
print(‘The cat said “meow.”’)
What is a variable?
A name that references a value in the computer’s memory.
Which of the following are illegal variable names in Python, and why?
x 99bottles july2009 theSalesFigureForFiscalYear r&d grade_report
99bottles is illegal because it begins with a number.
r&d is illegal because the & character is not allowed.
Is the variable name Sales the same as sales? Why or why not?
No, variable names are case sensitive.
Is the following assignment statement valid or invalid? If it is invalid, why?
72 = amount
It is invalid, the variable that is receiving the assignment (in this case ‘amount’) must appear on the left side of the = operator.
What will the following code display?
val = 99
print(‘The value is’, ‘val’)
The value is val
Look at the following assignment statements:
value1 = 99 value2 = 45.9 value3 = 7.0 value4 = 7 value5 = 'abc'
After these statements execute, what is the Python data type of the values referenced by each variable?
value1: int.
value2: float
value3: float
value4: int.
value5: str
What will be displayed by the following program?
my_value = 99
my_value = 0
print(my_value)
0
What value will be assigned to “result” after the following statement executes?
result = 9 // 2
4
(The floor division operator, also referred to as integer division operator. The resultant value is a whole integer, though the result’s type is not necessarily int.)
What value will be assigned to “result” after the following statement executes?
result = 9 % 2
1
The Modulus operator returns the decimal part (remainder) of the quotient.
How do you suppress the print function’s ending newline?
If you don’t want the print function to start a new line of output when it finishes displaying its output, you can pass the special argument “ end = ‘’ “ to the function.
How can you change the character that is automatically displayed between multiple items that are passed to the print function?
You can pass the argument “ sep= “ to the print function, specifying the desired character.
What is the ‘\n’ escape character?
It is the newline escape character.
What does the + operator do when it is used with two strings?
It is the string concatenation operator, which joins two strings together.
What does the statement print(format(65.4321, ‘2f’) display?
65.43
What does the statement print(format(987654.129, ‘2f’) display?
978,654.13
What are three advantages of using named constants?
- Named constants make programs more self-explanatory.
- Widespread changes can easily be made to the program
- They help to prevent the typographical errors that are common when using magic numbers.
Write a Python statement that defines a named constant for a 10 percent discount.
variableName = 0.1
