Julia: variables

Variable is a named memory location that points to a value.

julia> firstName="Hari Krishna"
"Hari Krishna"

julia> lastName="Gurram"
"Gurram"

julia> age=27
27

Observe above code snippet, it define three variables firstName, lastName and age. Variable firstName, lastName are of type string and age of type integer.

julia> typeof(firstName)
ASCIIString

julia> typeof(lastName)
ASCIIString

julia> typeof(age)
Int64

Since Julia is a dynamic language, you can assign any type of value to a variable.

julia> x=10
10

julia> typeof(x)
Int64

julia> x=10.234
10.234

julia> typeof(x)
Float64

julia> x=true
true

julia> typeof(x)
Bool

julia> x="Krishna"
"Krishna"

julia> typeof(x)
ASCIIString

Variable names are case sensitive, i.e, myName, MyName, myname are three different variables.

julia> myName="Krishna"
"Krishna"

julia> myname="hari"
"hari"

julia> MyName="gopi"
"gopi"

julia> myName
"Krishna"

julia> MyName
"gopi"

julia> myname
"hari"

You can construct a variable name using any Unicode characters.

julia> 名称="Hari Krishna"
"Hari Krishna"

julia> 年龄=27
27

julia> 名称
"Hari Krishna"

julia> 年龄
27

Naming conventions for a variable

a.   Variable name must begin with a character a-z, A-Z, _(underscore) (or) a subset of Unicode code points greater than 00A0.

b.   Subsequent characters (after first character) include ! and digits 0-9.

c.    Variable names are in lower case as per convetion.

d.   Separate long variable names with underscore(_) like my_name, my_age, my_salary.

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