鸿蒙OS-Number-树叶云鸿蒙OS教程 (鸿蒙OSnext和鸿蒙OS一样吗)

教程大全 2025-07-15 12:45:09 浏览

抽象类 Number 是平台类的超类,表示可转换为基本类型 byte、double、float、int、long 和 short 的数值。 从特定 Number 实现的数值到给定基本类型的转换的特定语义由所讨论的 Number 实现定义。 对于平台类,转换通常类似于在《Java™ 语言规范》中定义的用于在原始类型之间进行转换的缩小原始转换或扩展原始转换。 因此,转换可能会丢失有关数值整体大小的信息,可能会丢失精度,甚至可能返回与输入符号不同的结果。


C语言 奇偶性

鸿蒙OSnext和鸿蒙OS一样吗

偶数的二进制末尾肯定是0,奇数的肯定是1,所以如果一个整数和1作位与操作的结果不为0的话就是奇数,反之为偶数(num & 1) 奇数else 偶数

用VB编写的计算器代码哪里有啊?

Private Sub txtDisplay_keyPress(KeyAscii As Integer)Dim ch As Stringch = Chr$(KeyAscii)Select Case chCase Sub DeleteCharacter()Dim txt As StringDim min_len As Integertxt = txtDisplay; Add a decimal point to the display; Thennew_value = 0Elsenew_value = CDbl( = Keep the cursor on the right;CMDNumber_Click 6Case - Remove the last ; Add a number to the display; ThentxtDisplay;cmdNumber_Click 0Case ; Check for unusual Sub cmdClear_Click()cmdClearEntry_ClickStoredValue = 0Operator = opNoneEnd = ;0X。 过几天我还会做出一个来 Sub cmdDecimal_Click()If InStr( & Format$(Index)End IfEnd Sub Check for normal characters;7C, and = Format$(StoredValue)End Sub & txtDisplay;cmdNumber_Click 7Case cEnd _)End SubcmdOperator_Click opAddCase = Left$(txt; Sub Form_KeyPress(KeyAscii As Integer)txtDisplay_KeyPress KeyAsciiEnd Sub, Sub cmdEquals_Click()Dim new_value As DoubleIf Sub Form_KeyUp(KeyCode As Integer;+End IfEnd Sub Perform the previous operation;2, NewEntry = FalseElsetxtDisplay;-, , 1) = Sub cmdClearEntry_Click()txtDisplay;-, vbCr;) ThenBeepElseIf NewEntry ThentxtDisplay, Shift As Integer)txtDisplay_KeyUp KeyCode;; new_valueEnd SelectOperator = opNoneNewEntry = TruetxtDisplay;cmdNumber_Click 4Case Clear the current = Sub txtDisplay_KeyUp(KeyCode As Integer; Remember this operation;cmdOperator_Click opMultiplyCase End IfEnd IfEnd = txtDisplay;cmdNumber_Click 5Case & cmdNumber_Click 9Case Sub cmdNumber_Click(Index As Integer)If NewEntry ThentxtDisplay;;s Left$(txt; Check for normal characters;;, ShiftEnd Sub., vbKeyDeleteDeleteCharacterEnd SelectKeyCode = 0End Sub这是我找的参考; Sub cmdPlusMinus_Click()If NewEntry = Thenmin_len = 2Elsemin_len = 1End IfIf Len(txt) >cmdDecimal_ClickCase Sub txtDisplay_Change() IfEnd Sub Check for unusual Sub txtDisplay_GotFocus()txtDisplay_ChangeEnd Sub5cmdOperator_Click opSubtractCase min_len ThentxtDisplay; Calculate the result of the previous operation, 2)ElsetxtDisplay, Shift As Integer)Select Case KeyCodeCase vbKeyNumpad0cmdNumber_Click 0Case vbKeyNumpad1cmdNumber_Click 1Case vbKeyNumpad2cmdNumber_Click 2Case vbKeyNumpad3cmdNumber_Click 3Case vbKeyNumpad4cmdNumber_Click 4Case vbKeyNumpad5cmdNumber_Click 5Case vbKeyNumpad6cmdNumber_Click 6Case vbKeyNumpad7cmdNumber_Click 7Case vbKeyNumpad8cmdNumber_Click 8Case vbKeyNumpad9cmdNumber_Click 9Case vbKeyMultiplycmdOperator_Click opMultiplyCase vbKeyAddcmdOperator_Click opAddCase vbKeySeparatorcmdEquals_ClickCase vbKeySubtractcmdOperator_Click opSubtractCase vbKeyDecimalcmdDecimal_ClickCase vbKeyDividecmdOperator_Click opDivideCase = _txtDisplay;= Sub cmdOperator_Click(Index As Integer), 1) = cmdNumber_Click 8Case = Right$( = TrueEnd Sub Change the value Keep the cursor on the right;/;; Start a new )End IfSelect Case OperatorCase opNoneStoredValue = new_valueCase opAddStoredValue = StoredValue + new_valueCase opSubtractStoredValue = StoredValue - new_valueCase opMultiplyStoredValue = StoredValue * new_valueCase opDivideStoredValue = StoredValue / = Index*.0, = Len(txtDisplay;cmdClearEntry_ClickEnd SelectKeyAscii = 0End SubcmdNumber_Click 2Case , Len(txt) - 1)ElsetxtDisplay, saved value。 要是要的话加我QQ;cmdNumber_Click 3Case ElseIf Left$(txtDisplay, Prepare to perform an = = Format$(Index)NewEntry = FalseElsetxtDisplay;cmdEquals_ClickCase = ,应该比这个更简单一些的; Clear the current entryOption EXPlicitPrivate StoredValue As DoublePrivate Const opNone = 0Private Const opAdd = 1Private Const opSubtract = 2Private Const opMultiply = 3Private Const opDivide = 4Private Operator As IntegerPrivate NewEntry As BooleancmdNumber_Click 1Case cmdOperator_Click opDivideCase

1.创建一个存储过程,

CREATE PROCEDURE PRO_XSTJ AS select 系部编号, sum(case when sex=男 then 1 else 0 end)as 男生人数, sum(case when sex=女 then 1 else 0 end)as 女生人数 from 表名group by 系部编号

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