Variables

Question 1

why do we need variables

Answer 1

to use and re use them in code later

Question 2

generic format for variable

Answer 2

type name = expression

Question 3

what does type mean

Answer 3

the type of data that is being stored

Question 4

exmaples of types

Answer 4

integers, doubles, characters, bytes, shorts, longs, floats, booleans

Question 5

why do we need a name

Answer 5

to refer to the later

Question 6

what do we mean by an expression

Answer 6

assigning the variable a value

Question 7

rules for names of variables

Answer 7

1. lowerCamelCase
2. numbers cannot be first
3. meaningful

Question 8

what does lower camel case mean

Answer 8

first word is lower case first letter and every word after that begins with a capital letter

Question 9

two booleans

Answer 9

true and false

Question 10

why might they have used byte years ago rather than the default of int that we use nowadays

Answer 10

for maximum space storage

Question 11

max of char? why is this

Answer 11

65535 (all characters of all languages ww)

Question 12

what does it mean when we say its lossy

Answer 12

we cannot possibly accurately represent all the digits after a decimal eg PI

Question 13

example of a lossy precision

Answer 13

PI

Question 14

When are variables in scope

Answer 14

from the point they are defined until the body in which they are defined is ended (curley brackets ended)

Question 15

what does the error “cannot be resolved” mean

Answer 15

that the variable is not in scope

Question 16

to use a statement from a for loop outside of a for loop we must

Answer 16

define it beforehand

Question 17

can you redefine a variable in scope

Answer 17

no

Question 18

when are variables defined in the initializtion of a for loop destroyed

Answer 18

when the for loop is completed

Question 19

when are variables that are defined in the body of a for loop destroyed

Answer 19

after each iteration of the loop