Introduction to programming

Variables

A variable is a symbol whose value can change during the execution of a program

Example

Public class First Java Program

{

Public state Void main (string orgs[])

{

String x = "Hello World"

System.out.println(x)

Variable types

Boolean- True/False

Int- +/- whole number

long- +/- larger than an integer

short - +/- smaller than an integer

sting- Variable length

Char - single character

Double- Decimal or floating number

-

Example

Public class Assignment {

Public state void main ( string args[]) {

long x ;

x= 1000

double z = 10.3, y= -22.3

Sytem.out.println (x) ;

You must always assign a value to a variable before you use it within a program. E.g x = 1000;