Introduction to Java

Software
means computer instructions or dat
a. Anything that can
be stored electronically is software,
in contrast to storage devices and
display devices which are
called hardware.

system software
provides the basic non-
task-specific functions
of the computer

application software
which is used by users to
accomplish specific tasks.

Programming
the action or process of writing computer
programs.

Input
term denoting either an
entrance or changes which are
inserted into a system

process
a series of actions or steps
taken in order to achieve a
particular end

Output
To communicate
the results

Algorithm
a process or set of rules to be followed in calculations
or other problem-solving operations, especially by a
computer.

Data Types
A string is a sequence of characters, like "Hello world!".
A string can be any text inside quotes. You can use single or double quotes:
x = "Hello world!";
An integer is a number without decimals.
x = 5985;

Variables
Variables are "containers" for storing
information
Examples:
x=5
y=6
z=x+y

Assignment variable
Int x;
Declaration variable
X=1;

DATA Types
A floating point number is a number with a decimal point
x = 10.365;
Booleans can be either TRUE or FALSE.
x=true;
y=false;

DATA Type
The special NULL value represents that a variable has no value. NULL is the only possible value of
data type NULL.
x=null;

Activity
1. True
2. 5
3. 3.16
4. No
5. Hello world
6. One
7. “21”
8. 100.1
9. 17
10. 01

Arithmetic Operators
Operator Name Example Result
+ Addition $x + $y Sum of $x and $y
- Subtraction $x - $y Difference of $x and
$y
* Multiplication $x * $y Product of $x and $y
/ Division $x / $y Quotient of $x and $y
% Modulus $x % $y Remainder of $x
divided by $y

Comparison Operators
The PHP comparison
operators are used to compare two values (number or string):
Operator Name Example Result
== Equal $x == $y True if $x is equal to $y
=== Identical $x === $y True if $x is equal to $y, and they are of the same type
!= Not equal $x != $y True if $x is not equal to $y
<> Not equal $x <> $y True if $x is not equal to $y
!== Not identical $x !== $y True if $x is not equal to $y, or they are not of the same type
> Greater than $x > $y True if $x is greater than $y
< Less than $x < $y True if $x is less than $y
>= Greater than or equal
to
$x >= $y True if $x is greater than or equal to $y
<= Less than or equal to $x <= $y True if $x is less than or equal to $y

Introduction to Java

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Introduction to Java