Chapter 2 slides

Question 1

what can be included in an identifier?

Answer 1

letters, digits, underscores, and dollar signs

Question 2

what can an identifier start with?

Answer 2

a letter, an underscore, or a dollar sign. NO DIGITS

Question 3

what can an identifier not be?

Answer 3

reserved words, true, false, or null

Question 4

what must a char variable be encased in?

Answer 4

single quote, ‘…’ Ex. ‘A’

Question 5

how should variables be named?

Answer 5

lowercase unless multiple words, then lowercase first word followed by capital letter of each other word with no spaces in between

Question 6

how should class names be named?

Answer 6

no spaces, each word capitalized

Question 7

how should constants be named?

Answer 7

capitalize all letters in word, use underscores as spaces

Question 8

how to write exponent operations?

Answer 8

System.out.println(Math.pow(n1,n2)); // n1 raised to power of n2

Question 9

how to write scientific notation?

Answer 9

(num)e+2 or (num)e2

Question 10

augmented assignment operators

Answer 10

+=, -=, *=, /=, or %=. Means n += 8 -> n = n + 8

Question 11

preincrement operators

Answer 11

++var and –var. Increase or decrease var by 1, then use the new var in the statement.

Question 12

postincrement operators

Answer 12

var++ and var–. increase or decrease var by 1, but use the original var in the statement.

Question 13

order of variable types

Answer 13

byte, short, int, long, float, double

Question 14

how to show multiple decimals

Answer 14

multiply variable by 100, then divide by 100.0…