C# 0 The Complete Reference

x

 to 

x

 and assigns this result to 

y

. The value of 

x

 is incremented 

after its value has been obtained. However, the statement

y = x + ++x;

obtains the value of 

x

, increments 

x

, and then adds that value to the original value of 

x

.

The result is assigned to 

y

. As the output shows, simply changing 

++x

 to 

x++

 changes the 

number series from even to odd.

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PART I

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PART IPART I

One other point about the preceding example: Don’t let expressions like

x + ++x

intimidate you. Although having two operators back-to-back is a bit unsettling at first 

glance, the compiler keeps it all straight. Just remember, this expression simply adds the 

value of 

x

 to the value of 

x

 incremented.

Relational and Logical Operators

In the terms 

relational operator

 and 

logical operator, relational

 refers to the relationships that 

values can have with one another, and 

logical

 refers to the ways in which true and false values 

can be connected together. Since the relational operators produce true or false results, they 

often work with the logical operators. For this reason they will be discussed together here.

The relational operators are as follows:

Operator

Meaning

= =

Equal to

!=

Not equal to

>

Greater than

<

Less than

>=

Greater than or equal to

<=

Less than or equal to

The logical operators are shown next:

Operator

Meaning

&

AND

|

OR

^

XOR (exclusive OR)

||

Shor t-circuit OR

&&

Shor t-circuit AND

!

NOT

The outcome of the relational and logical operators is a 

bool

 value.

In general, objects can be compared for equality or inequality using