Test 3

Question 0

What does it mean to decrement a variable?

Answer 0

Subtract 1 from it

Question 1

What does it mean to increment a variable?

Answer 1

Add 1 to it

Question 2

What is a unary operator?

Answer 2

An operator with a single operand

Question 3

What does x++; mean?

Answer 3

Add 1 to x

Question 4

What does x–; mean?

Answer 4

Subtract 1 from x

Question 5

What is a binary operator?

Answer 5

An operator with 2 operands

Question 6

What does x+=5; mean?

Answer 6

Add 5 to x

Question 7

What’s does x-=5

Answer 7

Subtract 5 from x

Question 8

What does x*=5; mean?

Answer 8

Multiply x by 5

Question 9

What does x /=5 mean?

Answer 9

Divide x by 5

Question 10

What’s shorthand for x=x+23

Answer 10

x+=23 (etc for other operations)

Question 11

What data type is used to process individual characters?

Answer 11

char

Question 12

What data type is used to process one or more characters

Answer 12

String

Question 13

What kind of quotes used w/ String

Answer 13

Double “”

Question 14

What kind of quotes used with characters

Answer 14

Single ‘’

Question 15

What is accomplished by the statement c1=c2=c3=’Q’; what type of assignment is this called?

Answer 15

Every variable is assigned to the value of Q, chain assignment or chaining

Question 16

Why is + an overloaded operator

Answer 16

It concatenates (with String variables) and adds (with int or double)

Question 17

Who invented form of algebra based on logic statements that are either TRUE or FALSE

Answer 17

George Boole

Question 18

What data type can only store either TRU or false

Answer 18

Boolean

Question 19

What is datas formal language for the term simple data types

Answer 19

Primitive data types

Question 20

Code for assigning 2.7 as a CONSTANT for the value of E?

Answer 20

final double E = 2.7

Question 21

What happens when you attempt to alter the value of a constant?

Answer 21

Compile error

Question 22

What is the 1st form of program documentation?

Answer 22

To use comments

Question 23

Why did older programs 1960/70s use single-letter variables?

Answer 23

Memory scarce and expensive, save every byte possible

Question 24

Self-commenting variable

Answer 24

A variable whose name describes what it's used for (heightInches = 54)

Question 25

Instead of single-letter variables, nowadays variables should be...

Answer 25

Words or compound words

Question 26

In a well-documented programs, single line comments or multi line comments necessary?

Answer 26

Yaaa

Question 27

Does Java follow PEMDAS

Answer 27

Yupp

Question 28

How do u find square root?

Answer 28

Math.sqrt(x);

Question 29

How do u round?

Answer 29

Math.round(x)

Question 30

How do u round up?

Answer 30

Math.ceil(x);

Question 31

How round down?

Answer 31

Math.floor(x)

Question 32

How do u find max over min?

Answer 32

Math.max(x,y);

Question 33

How find absolute value?

Answer 33

Math.abs(x)

Question 34

How find power?

Answer 34

Math.pow(x,y)

Question 35

How times Pi?

Answer 35

Math.PI(x)

Question 36

Java source code file extension?

Answer 36

.java

Question 37

Float

Answer 37

decimals (7 places)

Question 38

Single line comments

Answer 38

Forward slashes // aka inline comments, provide brief summary comments for chunks of code

Question 39

Multi-line comments

Answer 39

Start with /* end with */

Question 40

Backslash \ + what makes a new line, backspace, horizontal tab, backslash, single and double quote?

Answer 40

\n, \b, \t, \\, \', \"

Question 41

Identifier

Answer 41

Name given to package, class, method, or variable (allows programmer to refer to item from other places in program)

Question 42

Variables can only have...

Answer 42

Letters, __, or $ Use lowercase first "appleBanana" unless it's a final/constant No reserved words

Question 43

Reserved/keywords are

Answer 43

Lowercase, NOT used as methods or variables

Question 44

A program with 1 or more compile errors?

Answer 44

Can compile, but will stop executing at point of compile error

Question 45

The "print" keyword...

Answer 45

Displays text output to monitor w/o carriage return (doesn't go to next line but "ln" does)

Question 46

Compiled files have the extension...

Answer 46

.class

Question 47

When dividing ints as opposed to doubles...

Answer 47

It takes the integer, so 4/5 is 0.8 but if it was an int it would be 0

Question 48

Finding modulus (remainder)

Answer 48

If q%=25, and q=14, it's 14%25 which is 14/25 and 14 is in the house

Question 49

Reserved words include

Answer 49

public void static double int if byte boolean package else class for return

Question 50

Powers of 2 wen converting??

Answer 50

2 to the 0, 2 to the 1, 2 to the 2....2 | to the 7