Operator <>（不等于）

• 来源: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgOpNotEqual
• 最后更新: 2016-03-13

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比较两个表达式是否不相等

语法

declare operator <> ( byref lhs as byte, byref rhs as byte ) as integer
declare operator <> ( byref lhs as ubyte, byref rhs as ubyte ) as integer
declare operator <> ( byref lhs as short, byref rhs as short ) as integer
declare operator <> ( byref lhs as ushort, byref rhs as ushort ) as integer
declare operator <> ( byref lhs as integer, byref rhs as integer ) as integer
declare operator <> ( byref lhs as uinteger, byref rhs as uinteger ) as integer
declare operator <> ( byref lhs as longint, byref rhs as longint ) as integer
declare operator <> ( byref lhs as ulongint, byref rhs as ulongint ) as integer

declare operator <> ( byref lhs as single, byref rhs as single ) as integer
declare operator <> ( byref lhs as double, byref rhs as double ) as integer

declare operator <> ( byref lhs as string, byref rhs as string ) as integer
declare operator <> ( byref lhs as zstring, byref rhs as zstring ) as integer
declare operator <> ( byref lhs as wstring, byref rhs as wstring ) as integer

declare operator <> ( byref lhs as T, byref rhs as T ) as integer

declare operator <> ( byref lhs as boolean, byref rhs as boolean ) as boolean

用法

result = lhs <> rhs

参数

lhs

要比较的左侧表达式。

rhs

要比较的右侧表达式。

T

任何指针类型。

返回值

如果表达式不相等，返回负一 (-1)；如果相等，返回零 (0)。

描述

Operator <>（不等于）是一个二元运算符，比较两个表达式的不等关系，并返回结果——主要以 Integer 形式表示的布尔值：真为负一 (-1)，假为零 (0)。仅当左右两侧类型都是 Boolean 时，返回类型才也是 Boolean。参数不会以任何方式被修改。

此运算符也可以重载以接受用户定义类型。

示例

start GeSHi

Dim As String a = "hello", b = "world"
Dim As Integer i = 10, j = i

If (a <> b) Then
  Print a & " does not equal " & b
End If

If (i <> j) Then
  Print "error: " & i & " does not equal " & j
End If

end GeSHi

Operator =（等于）是 Operator <>（不等于）的互补，与 Operator Not（按位取反）组合时功能相同。

start GeSHi

   If (69 <> 420) Then Print "(69 <> 420) is true."
   If Not (69 = 420) Then Print "not (69 = 420) is true."

end GeSHi

方言差异

• 在 -lang qb 方言中，此运算符不能被重载。

与 QB 的区别

• 无

参见

• Operator =（等于）

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