3
3
.
.
2
2
V
V
a
a
r
r
i
i
a
a
b
b
l
l
e
e
s
s
I
I
n
n
f
f
o
o
Scalars hold single value and can be: Constants, Variables, Optionals.
Scalars
val value1 : Int = 65 //CONSTANT (value)
var value2 : Int = 65 //VARIABLE (variable)
O
O
p
p
t
t
i
i
o
o
n
n
a
a
l
l
s
s
If Scalar can have null value it is called Optional (indicated by a question mark '?').
Optional Scalars
val value3 : Int? = null //OPTIONAL CONSTANT ('?' indicates that constant might not have value)
var value3 : Int? = null //OPTIONAL VARIABLE ('?' indicates that variable might not have value)
