ch 2

Question 1

the five stages of program development are

Answer 1

design program
write code
correct syntax
test program
correct logic

Question 2

software requirement is

Answer 2

a single function that the program must perform in order to satisfy the customer

Question 3

mixed type expression

Answer 3

an expression that uses operands of different data types

Question 4

pseudocode

Answer 4

informal language without syntax not meant to be compiled or executed
create models of programs focusing on design

Question 5

garbage collection

Answer 5

a process that removes values in memory that are no longer referenced by variables

Question 6

string

Answer 6

sequence of characters

Question 7

variable

Answer 7

references a value in computer memory

Question 8

end user

Answer 8

hypothetical person using a program providing input for it

Question 9

string literals in python must be enclosed by

Answer 9

single or double quotes

Question 10

exception

Answer 10

an unexpected error that cause program to halt if it is not solved properly

Question 11

an BLANK makes a variable reference a value in computer’s memory

Answer 11

assignment statement

Question 12

what are the operators for floating point division integer division and remainder?

Answer 12

/ float
// integer
% remainder

Question 13

function

Answer 13

piece of prewritten code that performs an operation

Question 14

algorithm

Answer 14

logical steps that must be taken to perform a task

Question 15

a professional programmer will first do what to gain understanding of a problem?

Answer 15

they will work directly with the customer
interviews the customer to uncover as many details as possible about the task
creates list of software requirements

Question 16

computer programs perform these 3 steps

Answer 16

receive input
perform some process with the input
produce output

Question 17

what is a format specifier and why is it used?

Answer 17

its a string that contains special characters specifying how a numeric value should be formatted
its useful in situations where you need a specific decimal precision such as dollar amounts

Question 18

whats the difference between floating point division and integer division

Answer 18

the result of each will yield an answer of the respective data type

Question 19

can you reassign multiple variables at once? like (x,y,z)=(a,b,c)

Answer 19

yes thats valid

Question 20

whats the line that will format
number = 1234567.456
into 1,234,567.5

Answer 20

print(format(number, ‘,.1f’))