Expressions and Operators - Illustrated C# 2005 - page 184

Relational and Equality Comparison Operators
The relational and equality comparison operators are binary operators that compare their
operands and return a value of type bool . These operators are listed in Table 8-8.
The relational and equality operators are binary and left-associative.

Table 8-8. The Relational and Equality Comparison Operators

Operator Name Description

< true if first operand is less than second operand; false

otherwise

Less than

> true if first operand is greater than second operand; false

otherwise

Greater than

<= true if first operand is less than or equal to second oper-

and; false otherwise

Less than or equal to

>= true if first operand is greater than or equal to second

operand; false otherwise

Greater than or equal to

== true if first operand is equal to second operand; false

otherwise

Equal to

!= true if first operand is not equal to second operand; false

otherwise

Not equal to

A binary expression with a relational or equality operator returns a value of type bool .

■ Note Unlike C and C++, numbers in C# do not have a Boolean interpretation.

int x = 5;
if( x ) // Wrong. x is of type int, not type boolean.
...
if( x == 5 ) // Fine, since expression returns a value of type boolean
...

When printed, the Boolean values true and false are represented by the string output val-
ues True and False .

int x = 5, y = 4;
Console.WriteLine("x == x is {0}", x == x);
Console.WriteLine("x == y is {0}", x == y);