Chapter 2: Input, Processing, And Output

Question 1

Who is a programmer’s customer?

Answer 1

Clients

Question 2

What is a software requirement?

Answer 2

It is the first and inital step in developing programs.

Question 3

What is an algorithm?

Answer 3

The set of rules or instruction which may be performed in order to complete the task.

Question 4

What is pseudocode?

Answer 4

pseudocode is an informal description of algorithm.

Question 5

What is a flowchart?

Answer 5

Question 6

What do each of the following symbols mean in a flowchart?
• Oval
• Parallelogram
• Rectangle

Answer 6

• The ovals, which appear at the top and bottom of the flowchart, are called terminal
symbols. The Start terminal symbol marks the program’s starting point and the End
terminal symbol marks the program’s ending point.

• Parallelograms are used as input symbols and output symbols. They represent steps in
which the program reads input or displays output.

• Rectangles are used as processing symbols. They represent steps in which the program
performs some process on data, such as a mathematical calculation.

Question 7

Write a statement that displays your name.

Answer 7

print(‘Name’)

Question 8

Write a statement that displays the following text:
Python’s the best!

Answer 8

Use double quation marks to display a string of charaters

print(“Python’s the best!”)

or

print(‘Python's the best!’)

Question 9

Write a statement that displays the following text:
The cat said “meow.”

Answer 9

print(‘The cat said “meow.”’)

or

print(“The cat said "meow."”)

Question 10

Write a statement that displays:

I’m reading “Hamlet” tonight.

Answer 10

print(“"”I’m reading “Hamlet” tonight.”””)

or

print(“I’m reading "Hamlet" tonight”)

Triple quotes you can put double and single quations in a statement.

Question 11

Write a comment saying:

The is a comment

Answer 11

This is a comment

Question 12

Legal or Not Legal for naming variables?

Answer 12

• legal
• legal
• illegal variables cannot start with digits
• legal
• illegal variables can only have letters, digits, and underscores

Question 13

What is a variable?

Answer 13

variables are memory locations of the computer which are used for storing the data values temparory , during the execution of an application.

Question 14

Which of the following are illegal variable names in Python, and why?

• x
• 99bottles
• july2009
• theSalesFigureForFiscalYear
• r&d
• grade_report

Answer 14

The 5th and 3rd variable is incorrect

Question 15

Is the variable name Sales the same as sales? Why or why not?

Answer 15

These are different variables. One is capital and one is lower case.

Question 16

Is the following assignment statement valid or invalid? If it is invalid, why?

72 = amount

Answer 16

the statement is illegal. The variable comes first before the value.

amount = 72 # valid

72 = amount # invalid

Question 17

What will the following code display?

val = 99

print(‘The value is’, ‘val’)

Answer 17

The value is val

Question 18

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?

Answer 18

1. integer
2. float
3. float
4. integer
5. string

Question 19

What will be displayed by the following program?

my_value = 99

my_value = 0

print(my_value)

Answer 19

0

The first variable got overwritten or redefine.

Question 20

You need the user of a program to enter a customer’s last name. Write a statement that prompts the user to enter this data and assigns the input to a variable.

Answer 20

c_last_name = input(“Enter the customer’s last name”)

Question 21

You need the user of a program to enter the amount of sales for the week. Write a statement that prompts the user to enter this data and assigns the input to a variable.

Answer 21

sales_for_the_week = float(input(“Enter the amount of sales for the week: “) )

Question 22

Python Math Operators

Answer 22

Question 23

What value will be assigned to result after the following statement executes?

result = 9 // 2

Answer 23

4

Question 24

What value will be assigned to result after the following statement executes?

result = 9 % 2

Answer 24

1

Question 25

What does the argument end=’ ‘ do to the function, as shown in the following code:

print(‘One’, end=’ ‘)

print(‘Two’, end=’ ‘)

print(‘Three’)

Answer 25

It will print the following code:

One Two Three

Question 26

What does the argument end=’‘ do to the function, as shown in the following code:

print(‘One’, end=’’)

print(‘Two’, end=’’)

print(‘Three’)

Answer 26

It will print the following code:

OneTwoThree

Question 27

What is the Separator argument use in print functions to seperate multiple arguments ?

Answer 27

sep=’ ‘

Question 28

print this sentence is two different ways:

One Two Three

Answer 28

and

**print('One', 'Two', 'Three')**
#and

print(‘One Two Three’)

print(‘One’, ‘Two’, ‘Three’, sep=’ ‘)

Question 29

Print the following code in 2 different ways:

OneTwoThree

Answer 29

and

print(‘OneTwoThree’)

print(‘One’, ‘Two’, ‘Three’, sep=’’)

Question 30

print the sentence in two different ways:

One*Two*Three

Answer 30

and

print(“One*Two*Three”)

print(‘One’, ‘Two’, ‘Three’, sep=’*’)

Question 31

Escape Characters

Answer 31

Question 32

What is the format specifier and what does it do?

Answer 32

The format specifier is a string that contains special characters specifying how #the numeric value should be formatted.

format( number, ‘f‘)orformat(number, ‘d‘)

Question 33

print the following number and round it to the nearest tenths:

12345.6789

Answer 33

print(format(12345.6789, ‘.1f’))

Question 34

How to format a number in Scientific Notation?

Answer 34

format( , ‘e’)

Question 35

How to format a number where it has commas?

Answer 35

format( number , ‘,f’) or format( number , ‘,d’)

Question 36

How to format a number to do a certain amount of spaces?

Answer 36

Output—-> The number is 12345.68

format(number, ‘spaces.f’) or format(number, ‘spaces.d’)

Example

• print(‘The number is’, format(12345.6789, ‘12.2f’))

Question 37

How to format a number into a decimal?

Answer 37

format( decimal , ‘ % ’)

Question 38

How to format an integer to have commas?

Answer 38

output—> 123456

format( integer, ‘d’)

Example

• print(format(123456, ‘10d’))

• print(format(123456, ‘20d’))

• print(format(123456, ‘10,d’))

Question 39

A __________ is a single function that the program must perform in order to satisfy the customer.

Answer 39

software requirement

Question 40

An informal language that has no syntax rules and is not meant to be compiled or executed is called __________.​

Answer 40

pseudocode

Question 41

A __________ is a sequence of characters.​

Answer 41

string

Question 42

A __________ is a name that references a value in the computer’s memory.

Answer 42

variable

Question 43

A __________ is any hypothetical person using a program and providing input for it.

Answer 43

user

Question 44

A string literal in Python must be enclosed in _____.

Answer 44

either single-quotes or double-quotes.

Question 45

A(n) __________ makes a variable reference a value in the computer’s memory.​

Question 46

Round 12345.6789 to the nearest hundrends

print the following code:

Answer 46

Answer

format(12345.6789, ‘.2f’)

Question 47

• print the number 12345.6789 in scienctic notation.
• print the number 12345.6789 in scientic notation and round to the nearest hundrendths.

Answer 47

The output—> 1.234568e+04

print(format(12345.6789, ‘e’))

print(format(12345.6789, ‘.2e’))

Question 48

• print the number 12345.6789.Make the number with commas and round it to the nearest tenths.
• print the number 12345.6789.Make the number with commas and do not round.

Answer 48

Output—-> 12,345.68

print(format(12345.6789, ‘,.2f’))

print(format(12345.6789, ‘,f’))

Question 49

• Convert the number .5 into a percentage.

Answer 49

Output—> 50.0000%

print(format(0.5, ‘%’))

print(format(0.5, ‘.0%’))

Question 50

In the expression 12 + 7, the values on the right and left of the + symbol are called_________.

Answer 50

operands

Question 51

what operator performs integer division?

Answer 51

//

Question 52

what operator raises a number to a power?

Answer 52

**