programming-for-dummies

546
Using Operators
Relational operators compare two values and return a True or False value.
The six relational operators available are shown in Table 2-5.
Table 2-5
Relational Operators
Relational Operator
Purpose
== Equal
!= Not equal
< Less than
Greater than
>= Greater than or equal to
The relational operator in Java/C# is two equal sign symbols (==) whereas
the relational operator in other programming languages is just a single equal
sign symbol (=). If you only use a single equal sign to compare two values in
Java/C#, your program will work but not the way it’s supposed to.
Logical operators compare two Boolean values (True or False) and return
a single True or False value, as shown in Table 2-6.
Table 2-6
Logical Operator
&&
Logical Operators
Truth Table
True && True = True
True && False = False
False && True = False
False && False = False
|| True || True = True
True || False = True
False || True = True
False || False = False
! !True = False
!False = True
Increment and decrement operators
Both Java and C# have a special increment (++) and a decrement (--) operator,
which simply adds or subtracts 1 to a variable. Typically, adding 1 to a
variable looks like this:
j = 5;
i = j + 1;