Quiz 1 Material

Question 1

sequence

Answer 1

• we start with the instruction written at the top
• we go in order, one instruction at a time
• each line is “one” thing to do

Question 2

repetition

Answer 2

repeat something - LOOP
(- repeat a fixed number of times
- repeat until something happens)

Question 3

conditions/decisions

Answer 3

maybe do something - IF
(- check something first)

Question 4

Named Actions

Answer 4

• grouping many lower level actions in to one higher level name
• FUNCTION
• we think of a named action in 2 ways
  
  • definition of the name action
  • use of the named action

Question 5

pseudocode

Answer 5

not quite in the computer’s language
(- it’s still specific, detailed, and followable
- no specific syntax)

Question 6

algorithm

Answer 6

• a step by step list of instructions to solve a problem
  (these steps must be followed EXACTLY)

Question 7

good algorithm

Answer 7

• unambiguous
• executable
• terminating
• correct

Question 8

statement

Answer 8

a single action to perform

Question 9

execute

Answer 9

follow an instruction or sequence of instructions

Question 10

program

Answer 10

the sequence of statements to be executed

Question 11

keyword

Answer 11

a word that guides how to execute your program

Question 12

variable

Answer 12

a name for a values, the value it is naming may change during execution - the name cannot be a keyword

Question 13

expression

Answer 13

a portion of a statement describing a value

Question 14

loops

Answer 14

statements that we might execute over and over again

Question 15

every value has a _____

Answer 15

type

Question 16

type casting

Answer 16

“reshape” a value of one type into a value of a different type

Question 17

how would you typecast an integer 7 to a string?

Answer 17

str(7)

Question 18

does a type casted function change the type of the preexisting value?

Answer 18

no, it just returns a value of the new type

Question 19

integer

Answer 19

int - a whole number

Question 20

float

Answer 20

float - a number that may contain a decimal part

Question 21

+

Answer 21

add

Question 22

-

Answer 22

subtract

Question 23

*

Answer 23

multiply

Question 24

**

Answer 24

exponent

Question 25

/

Answer 25

divide
- always produces a FLOAT

Question 26

//

Answer 26

integer division
- produces the INTEGER part of the answer

Question 27

%

Answer 27

modulus
- produces just the remainder

Question 28

what does this produce? -> float and float

Answer 28

float

Question 29

what does this produce and when is there an exception? -> int and int

Answer 29

int
- exception /

Question 30

what does this produce and when is there an exception? -> float and int

Answer 30

float
- exception /

Question 31

comments

Answer 31

notes for the programmer that Python ignores

Question 32

input

Answer 32

input(prompt)
- a function that gets user input as a ‘str’

Question 33

print

Answer 33

print(object)
- a function when we want to print something to the screen

Question 34

what is x? -> x = ‘20’ + ‘30’

Answer 34

‘2030’

Question 35

escape sequences

Answer 35

• the \ character followed by another letter
• says to python “don’t do what you would normally do with that character”

Question 36

'
"
\n
\

Answer 36

• single quote, don’t end the string
• double quote, don’t end the string
• newline character (like hitting enter)
• the backlash character

Question 37

can you print a str and an integer together in the same line?

Answer 37

no, the integer has to be typecasted to a string

Question 38

syntax error

Answer 38

code violates the rules of the programming language, and thus can’t be run

Question 39

runtime error

Answer 39

code runs, but enters an illegal state or tries to do something impossible (ex. int divide by zero)

Question 40

logical error

Answer 40

this causes your program to operate incorrectly, but not crash, the output is incorrect