Rules for Variable Declaration, • Variable name only start with a letter, an underscore ( _ ), of a dollar sign ( $ ). • The variable name should start with only letters • White spaces are not allowed between characters of variable but undersores are approved. • The variable name is case sensitive –TEMP and temp is different variable.

1. RULES FOR VARIABLE
DECLARATION

2. RULES FOR VARIABLE DECLARATION
O Variable name only start with a letter, an underscore ( _ ), of a dollar sign
( $ ).
O The variable name should start with only letters
O White spaces are not allowed between characters of variable but
undersores are approved.
O The variable name is case sensitive –TEMP and temp is different
variable.
O No two variables of same name are allowed to be declared in the same
scope.
O Every variable used must be declared.
O Javascript allows declaration statements anywhere in the list of
statements.
O Variable declarations announce what variables will be used in the
program.
O A variable must be declared before it can be used.
O Declaration statements can also be used to store an initial value into
declared variables.
O Variable name cannot start with a number.

3. RULES FOR VARIABLE DECLARATION
O In java a variable name cannot start with a didit or hyphen.
O Al variable can be “31” character long for many compiler.
O Key word are not used as variable name.
O Blank spaces special symbols commas are not used.
O The first letter of the variable must be character of
underscore.
O The java languafe is case sensitive which implies that the
variable num in lowercase is different from variable num in
upper case.
O Declaring an initial value of variable in the declaration
statement is optional.
O Variable may be declared in a list.
O Both lower case and higher case digits are distinct.

4. Purpose of lab 1
O It was a general lab. In lab 1 we have studied about
of python and learned about how to join google class.
O Program 1:
O This program will display my name.
O Code: Print (“Shaher Bano”)
O Output:
O Mr. Usman
O Program 2:
O This program will display members of my family.
O Code: Print (“there are four members in my family.”)
O Output:
O there are four members in my family.

5. Program 3:
O This program will display the table of two.
Code:
O Print (“2x1=2”)
O Print (“2x2=4”)
O Print (“2x3=6”)
O Print (“2x4=8”)
O Print (“2x5=10”)
O Print (“2x6=12”)
O Print (“2x7=14”)
O Print (“2x8=16”)
O Print (“2x9=18”)
O Print (“2x10=20”)

6. Output:
O 2x1=2
O 2x2=4
O 2x3=6
O 2x4=8
O 2x5=10
O 2x6=12
O 2x7=14
O 2x8=16
O 2x9=18
O 2x10=20

7. O Program 4:
O This program will display my favorite book.
O Code: Print (“Mathematics”)
O Output:
O Mathematics
O Program 5:
O This program will display the addition of three
digits.
O Code: Print (“2+2+3”)
O Output:
O 2+2+3

8. Thanks you…..