Comp Sci

Question 1

How many bits in a byte

Answer 1

8

Question 2

How many bits in a nibble

Answer 2

4

Question 3

Files

Answer 3

a large group of bytes in auxiliary memory

Question 4

What is the place called where files are stored

Answer 4

directories/folders

Question 5

Which takes precedence in the ||: True or False

Answer 5

True takes precedence

Question 6

Which takes precedence in the &&: True or False

Answer 6

False takes precedence

Question 7

What does an enumeration do

Answer 7

lists the values a variable can have

Question 8

int m = 4;
int results = 3 * (++m);

Answer 8

results = 15

Question 9

int m = 4;
int results = 3 * (m++);

Answer 9

results = 12

Question 10

What is encoding

Answer 10

translating from one set of symbols to another set of symbols (integer to binary)

Question 11

What are the 8 primitive data types

Answer 11

int, double, char, Boolean, float, long, short, byte

Question 12

What are 6 comparison operators

Answer 12

==, <=, >=, !=, <, >

Question 13

What are the 3 logical operators

Answer 13

&&, ||, !

Question 14

Lexicographic Order rules

Answer 14

all numbers come before letters and all uppercase letters come before lowercase letters

Question 15

What is the Lexicographic Order based on

Answer 15

based on the character order in the Unicode character set

Question 16

What is another word for conditional operator

Answer 16

ternary operator

Question 17

When is a boolean expression a tautology

Answer 17

when the result is always true

Question 18

When is a boolean expression a contradiction

Answer 18

when the result is always false

Question 19

When is a boolean expression a contingency

Answer 19

when it is neither a tautology nor a contradiction

Question 20

Tautology/Contradiction/Contingency?

(x == y) || (x != y)

Answer 20

tautology

Question 21

Tautology/Contradiction/Contingency?

(x == y) && (x != y)

Answer 21

contradiction

Question 22

Tautology/Contradiction/Contingency?

(x && y)
where both x and y = boolean values

Answer 22

contingency

Question 23

general formula for encoding

Answer 23

ceiling(log2(n))

Question 24

general formula for encoding in English

Answer 24

see how many times we can divide by 2 (starting at n) until we reach the quotient 0.

Question 25

What are the 4 types of integer values

Answer 25

byte, int, short, long

Question 26

What the 2 types of floating point numbers

Answer 26

float, double

Question 27

What kind of value is a character

Answer 27

single character

Question 28

What kind of value is a boolean

Answer 28

Boolean

Question 29

how much memory does one byte use

Answer 29

1 byte

Question 30

how much memory does one int or one float use

Answer 30

4 bytes

Question 31

how much memory does one short or one char use

Answer 31

2 bytes

Question 32

how much memory does one long or one double use

Answer 32

8 bytes

Question 33

What does ASCII stand for

Answer 33

American Standard Code for Information Interchange

Question 34

How many symbols does 7-bit ASCII contain

Answer 34

2^7 (128 symbols)

Question 35

How many symbols does 8-bit ASCII contain

Answer 35

2^8 (256 symbols)

Question 36

Java uses _________ for ____

Answer 36

16-bit Unicode, char

Question 37

what are 2 ways floating-point constant can be written as

Answer 37

1, numbers after decimal place 2. e notation

Question 38

In Java, you can't store a floating-point number in a variable that is declared as an int because...

Answer 38

Java is said to be strongly typed

Question 39

What is the data stored by a variable called

Answer 39

value

Question 40

Which one is the assignment operator: = or ==?

Answer 40

=

Question 41

RAM

Answer 41

random access memory

Question 42

main memory is a type of ___________

Answer 42

volatile memory

Question 43

auxiliary memory is also called...

Answer 43

secondary memory

Question 44

what is a program

Answer 44

a finite sequence of instructions for a computer to follow written in a programming language

Question 45

Following the instructions is called

Answer 45

running or executing the program

Question 46

What is a process

Answer 46

a program that is currently executing

Question 47

What does the operating system do?

Answer 47

oversees the operation of the computer and its main job is to manage processes and hardware resources

Question 48

do computers understand high-level languages like java?

Answer 48

no which is why computers have compilers

Question 49

what do compilers do

Answer 49

they translate programs from high-level languages to low-level languages

Question 50

Does the java compiler translate from java to machine language?

Answer 50

no, it translates it into java byte-code

Question 51

What happens after the Java compiler translates the program to byte-code

Answer 51

the interpreter translates each byte-code instruction into machine language before it moves on to the next byte-code instruction

Question 52

The class loader...

Answer 52

automatically connects different classes together in Java

Question 53

What is a package

Answer 53

a library of classes that have already been defined ex. java.util.Math;

Question 54

what does a statement end with

Answer 54

a semicolon;

Question 55

what are the grammar rules of code called

Answer 55

syntax

Question 56

When printing to a screen (System.out.println()) which part is the object and which part is the method/function?

Answer 56

Object- System.out Method/Function- println

Question 57

What is the difference between the pre-compiled version and the byte-code version of a program

Answer 57

they have the same name, but the pre-compiled version ends in .java, while the byte-code version ends in .class

Question 58

What are the 3 types of errors

Answer 58

1. Syntax error 2. Run-time error 3. Logic/Semantic errors

Question 59

What are syntax errors?

Answer 59

grammatical errors; they are shown with red squiggly line under code or smthg like that

Question 60

What are runtime errors?

Answer 60

Errors that occur when you run a program (like dividing by zero or going Index Out of Bounds); the program usually terminates itself in times like this

Question 61

What are logic/ semantic errors?

Answer 61

Errors that allow the program to run, but produce incorrect results like if you wanted a program that produces the sum of numbers but you accidentally put the formula as x - y. The program will still run, but it will give you the wrong value as the sum.

Question 62

you got this

Answer 62

i bet i do