Week 2

Question 1

Double quotes around the text =

Answer 1

a String of characters

Question 2

+ in a String =

Answer 2

Strong concatenation operator

Question 3

Escape Sequences

Answer 3

\t = tab
\n = newline
\r = carriage return
\” double quote
\’ = single quote
\\ = backslash

Question 4

variable

Answer 4

is a name for a “location” in memory

Question 5

a variable must be declared with…

Answer 5

the type of information that it will hold

Question 6

a bit can be either…

Answer 6

a 1 or a 0

Question 7

a string of N bits can be used to represent…

Answer 7

2 to the Nth different values

Question 8

8 primitive data types in Java

Answer 8

• integer
  
  • byte 8 bits
  • short 16 bits
  • Int 32 bits
  • long 64 bits
• floating
  
  • float 32 bits
  • double 64 bits
• character
  
  • char 65,536 unique characters
• boolean
  
  • boolean (true or false)

Question 9

an expression is made up of one or more …

Answer 9

variables, operators, and/or method invocations that evaluates to a single value.

Question 10

arithmetic expressions

Answer 10

+, -, *, /, %(remainder aka modulus)

Question 11

increment operator

Answer 11

++

Question 12

decrement operator

Answer 12

–

Question 13

x += count is the same as…

Answer 13

x = x+count

Question 14

Relational Operators (for Boolean Values)

Answer 14

== Equal
!= Not equal
< less than
<= less than or equal 
> greater than
>=greater than or equal

Question 15

Data conversions can occur in three ways…

Answer 15

• assignment conversion – a value of one type is assigned to a variable of another. Allows only widening conversions. (ex. An int into a double)
• promotion – happens when operators in expressions converts their operands. Happens in math equations.
• casting – allows narrowing conversions and widening conversions. They type in parenthesis is placed in front of the value being converted. (result = (double) total/count)

Question 16

nextLine() next() are methods in…

Answer 16

the Scanner (import java.util.Scanner) class which return a String value

Question 17

nextInt(), and nextDouble()

Answer 17

convert to their type

Question 18

unless specified otherwise, tokens are

Answer 18

delimited by white space, which include spaces, tabs, newlines, and return characters.