computer comments

Question 1

These are ignored by the compiler.
* It is used by the programmer to leave notes for themselves and for
those who might read their programs in the future.
* It is also used to help out the programmer to locate the possible error
of the program by commenting out some statements that may cause
the error.
* It is the “eraser” of programmers.

Answer 1

comments

Question 2

TYPES OF COMMENTS

Answer 2

Line comment
Block Comment
Javadoc

Question 3

It starts with 2 slashes (//)

Answer 3

Line comment

Question 4

It starts with (/) and ends with (/)

Answer 4

Block Comment

Question 5

special case of block comments.
- It starts with (/**) and ends with (*/)

Answer 5

Javadoc

Question 6

T or F
The filename can’t always be the same as the name of the class.

Answer 6

F

Question 7

T or F
file name must have “.java” extension

Answer 7

T

Question 8

enumerate the steps in compiling a java class

Answer 8

• Open command prompt
• Go to the folder where the program (code) is saved.
• Enter: “javac First.java”

Question 9

T or F
There can be 3 output after compiling:
1. No message – success compilation
2. Programming language error – syntax error in the code.
3. Javac not recognized error -

Answer 9

T

Question 10

enumerate the steps in MODIFYING A JAVA PROGRAM

Answer 10

• Open the java source code.
• Add the modifications.
• Recompile the class
• Rerun the application

Question 11

when the value of data item cannot be changed while running a program.

Answer 11

constant

Question 12

can be refer as literal constant, numeric constant, unnamed
constant or simply, hard-coded.

Answer 12

459

Question 13

a named memory location that can store a value.
- It can only hold one value but the value it hold can be
changed.

Answer 13

Variable

Question 14

describes the type of data that can be stored, how much memory the item occupies and types of operation that can be perform on the data.

Answer 14

Data type

Question 15

is a statement that reserves a named memory
location and includes the following:

Answer 15

varieble declaration

Question 16

that identifies the type of data that the variable will store

Answer 16

data type

Question 17

variable’s name

Answer 17

identifier

Question 18

if you want a variable to contain an initial value

Answer 18

An optional assignment operator (=) and assigned value,

Question 19

begins with lowercase letter and capitalizing subsequent words within the identifier.

Answer 19

Camel Casing

Question 20

what is Example: int myAge = 21;

Answer 20

example of initialized variable.

Question 21

what is example: int myAge;

Answer 21

uninitialized variable

Question 22

Uninitialized variable – contains what unknown value

Answer 22

garbage value

Question 23

to declare 2 or more variables of the same type in a single statement, it is separated by a comma.

Answer 23

Multiple variable declaration

Question 24

the value of the location should not be changed
during execution.

Answer 24

Named Constant

Question 25

T or F
Named constant is similar to variable: it has data type, name, value.

Answer 25

T

Question 26

In order to concatenate variable to a String, we need to use what sign?

Answer 26

plus sign (+)

Question 27

Integer Data Types

Answer 27

All of integer data type are signed (+ or -)

Question 28

3. Declaring integer data type:
   * — (variable)
   * —- (variable)
   * —– (variable)
   * —- (variable)

Answer 28

int
byte
short
long

Question 29

It is a logic that is based on TRUE or FALSE comparisons.

Answer 29

boolean data type

Question 30

use to compare two items.
- also called “comparison operators

Answer 30

relational operator

Question 31

number contains decimal.

Answer 31

Floating-point

Question 32

point data types

Answer 32

two floating

Question 33

data type that can hold values up to 6 or 7 significant
accuracy

Answer 33

float

Question 34

data type that can hold values up to 14 or 15 significant accuracy.

Answer 34

double

Question 35

– data type to hold single character.

Answer 35

char

Question 36

built-in class that provides the means for storing and manipulating character strings.

Answer 36

String

Question 37

To declare String: String (variable) =

Answer 37

“value”

Question 38

special characters that begins with a backslash

Answer 38

Escape Sequence

Question 39

is used for obtaining the input of the primitive data type.

Answer 39

Scanner

Question 40

Scanner (variable) =

Answer 40

new Scanner(System.in);

Question 41

is the principle in creating private access.
an important component of Object-Oriented
programs.

Answer 41

Information hiding

Question 42

Java supports two types of division

Answer 42

Floating-point division
Integer division

Question 43

– occurs when both operand are integers

Answer 43

Integer division

Question 44

occurs when either or both operands are
floating-point values.

Answer 44

Floating-point division –

Question 45

is the process of converting one data type to
another.

Answer 45

Type conversion –

Question 46

• Types of Conversion

Answer 46

1. Implicit Conversion
2. Explicit Conversion

Question 47

it automatically converts nonconforming operands to the unifying type. It is also called Promotions.

Answer 47

1. Implicit Conversion

Question 48

is the type to which all operands in an expression are converted so that they are compatible to each other

Answer 48

Unifying type –

Question 49

is the overriding the unifying type.

Answer 49

Explicit Conversion

Question 50

forces the value of one data type to be used as a value of another data type.

Answer 50

Type Casting

Question 51

is created by placing the desired result type in
parenthesis.

Answer 51

Cast Operator –