Visual Basic(簡稱VB)是Microsoft公司開發的一種通用的基于對象的程序設計語言,為結構化的、模塊化的、面向對象的、包含協助開發環境的事件驅動為機制的可視化程序設計語言。是一種可用于微軟自家產品開發的語言。 [1] “Visual” 指的是開發圖形用戶界面 (GUI) 的方法——不需編寫大量代碼去描述界面元素的外觀和位置,而只要把預先建立的對象add到屏幕上的一點即可。 “Basic”指的是 BASIC (Beginners All-Purpose Symbolic Instruction Code) 語言,是一種在計算技術發展歷史上應用得最為廣泛的語言。
標簽: VB精選
上傳時間: 2019-03-06
上傳用戶:Yingshangling
在包 hugeinteger 中創建功能類 HugeInteger,該類用來存放和操作一個不超過 40 位的大整數。 (1) 定義一個構造函數,用來對大整數進行初始化。參數為一個字符串。 (2) 定義 input 成員函數,實現大整數的重新賦值。參數為一個字符串,無返回 值。 (3) 定義 output 成員函數,將大整數輸出到屏幕上。無參數無返回值。 (4) 定義 add 成員函數,實現兩個大整數的加法。參數為一個 HugeInteger 對 象,無返回值,例如: HugeInteger A = new HugeInteger("12345"); HugeInteger B = new HugeInteger("1234"); A.add(B); 此時,A 為 13579,B 為 1234。 (5) 定義 sub 成員函數,實現兩個大整數的減法。參數和返回值同 add 函數。 (6) 定義若干大整數關系運算的成員函數,包括 isEqualTo(等于,=)、 isNotEqualTo(不等于,≠)、isGreaterThan(大于,>)、isLessThan(小 于,<)、isGreaterThanOrEqualTo(大于等于,≥)和 isLessThanOrEqualTo (小于等于,≤)。這些函數的參數為一個 HugeInteger 對象,返回值為一個 布爾類型,表示關系運算的結果,例如: HugeInteger A = new HugeInteger("12345"); HugeInteger B = new HugeInteger("1234"); 那么此時 A.isGreaterThan(B)的結果應當為 True,表示 12345>1234。
上傳時間: 2019-06-01
上傳用戶:idealist
keil C51 v6.12 完全解密版的安裝說明 安裝方法是先將V6.12安裝程序復制到某個目錄下,如復制到D:\keilC51 然后執行D:\keilC51\setup\setup.exe 安裝程序,選擇安裝Eval Version版進 行安裝。 注冊碼:K199U-20071-12A9U 當出現Please insert the add-on disk的提示畫面,可按next按鈕(不用 插入軟盤)。 安裝好之后就可以使用,沒有代碼大小的限制,這是完全版,比 Eval版增 加浮點庫等內容。
上傳時間: 2020-03-20
上傳用戶:mimeme
At present, there is a strong worldwide push toward bringing fiber closer to indi- vidual homes and businesses. Fiber-to-the-Home/Business (FTTH/B) or close to it networks are poised to become the next major success story for optical fiber com- munications. In fact, FTTH connections are currently experiencing double-digit or even higher growth rates, e.g., in the United States the annual growth rate was 112% between September 2006 and September 2007, and their presence can add value of U.S. $4,000–15,000 to the selling price of a home.
標簽: Technologies Broadband Networks Access
上傳時間: 2020-05-26
上傳用戶:shancjb
This book is intended for RF planners, to serve as a practical tool in their daily work designing indoor radio distribution systems. Based on feedback from readers of the first edition it was clear to me that I needed to add more material and in depth description of the basics of indoor systems based on using repeaters; this has grown into a new Section 4.7. There was also a strong demand to add more detail and dedicate a full chapter to radio planning in tunnels, for both rail and road tunnels; and redundancy principles in the design focus for solving the challenge of handover zones. An entire Chapter 11 is now dedicated to tunnel radio planning.
上傳時間: 2020-05-27
上傳用戶:shancjb
Developers, manufacturers and marketers of products incorporating short- range radio systems are experts in their fields—security, telemetry, medical care, to name a few. Often they add a wireless interface just to eliminate wires on an existing wired product. They may adapt a wireless subsystem, which is easy to integrate electrically into their system, only to find that the range is far short of what they expected, there are frequent false alarms, or it doesn’t work at all. It is for these adapters of wireless subsystems that this book is primarily intended.
標簽: Communication Short-range Wireless
上傳時間: 2020-06-01
上傳用戶:shancjb
The mature CMOS fabrication processes are available in many IC foundries. It is cost-effective to leverage the existing CMOS fabrication technologies to implement MEMS devices. On the other hand, the MEMS devices could also add values to the IC industry as the Moore’s law reaching its limit. The CMOS MEMS could play a key role to bridge the gap between the CMOS and MEMS technologies. The CMOS MEMS also offers the advantage of monolithic integration of ICs and micro mechanical components.
標簽: TECHNOLOGY CMOS MEMS KEY
上傳時間: 2020-06-06
上傳用戶:shancjb
【實例簡介】 一、Delphi程序啟動Word 采用CreateOleObjects的方法來啟動Word,調用VBA代碼,具體實現過程為: 首先使用GetActiveOleObject('Word.Application')判斷當前內存中是否存在Word程序,如果存在,則直接連接,如果沒有Word程序,則使用CreateOleObject('Word.Application')啟動Word 二、Delphi程序新建Word文稿 格式:WordDocuments.Add(Template,NewTemplate,DocumentType,Visible) Template: 使用模板的名稱, NewTemplate: 新建文檔的類型,True表示為模板,False表示為文檔 DocumentType: 文檔類型,默認為空白文檔 Visible: 打撈的窗口是否可見
標簽: deljosdfsd
上傳時間: 2021-01-12
上傳用戶:
This texts contemporary approach focuses on the concepts of linear control systems, rather than computational mechanics. Straightforward coverage includes an integrated treatment of both classical and modern control system methods. The text emphasizes design with discussions of problem formulation, design criteria, physical constraints, several design methods, and implementation of compensators.Discussions of topics not found in other texts--such as pole placement, model matching and robust tracking--add to the texts cutting-edge presentation. Students will appreciate the applications and discussions of practical aspects, including the leading problem in developing block diagrams, noise, disturbances, and plant perturbations. State feedback and state estimators are designed using state variable equations and transfer functions, offering a comparison of the two approaches. The incorporation of MATLAB throughout the text helps students to avoid time-consuming computation and concentrate on control system design and analysis
標簽: 控制系統
上傳時間: 2021-12-15
上傳用戶:
一博科技PCB設計指導書VER1.0. 66頁常見信號介紹 1.1 數字信號 1.1.1 CPU 常稱處理器,系統通過數據總線、地址總線、控制總線實現處理器、控制芯片、存 儲器之間的數據交換。 地址總線:ADD* (如:ADDR1) 數據總線:D* (如:SDDATA0) 控制總線:讀寫信號(如:WE_N),片選信號(如:SDCS0_N),地址行列選擇信 號(如:SDRAS_N),時鐘信號(如:CLK),時鐘使能信號(如:SDCKE)等。 與CPU對應的存儲器是SDRAM,以及速率較高的DDR存儲器: SDRAM:是目前主推的PC100和PC133規范所廣泛使用的內存類型,它的帶寬為64位, 支持3.3V電壓的LVTTL,目前產品的最高速度可達5ns。它與CPU使用相同的時鐘頻 率進行數據交換,它的工作頻率是與CPU的外頻同步的,不存在延遲或等待時間。 SDRAM與時鐘完全同步。 DDR:速率比SDRAM高的內存器,可達到800M,它在時鐘觸發沿的上、下沿都能進行 數據傳輸,所以即使在133MHz的總線頻率下的帶寬也能達到2.128GB/s。它的地址 與其它控制界面與SDRAM相同,支持2.5V/1.8V的SSTL2標準. 阻抗控制在50Ω±10 %. 利用時鐘的邊緣進行數據傳送的,速率是SDRAM的兩倍. 其時鐘是采用差分方 式。 1.1.2 PCI PCI總線:PCI總線是一種高速的、32/64位的多地址/數據線,用于控制器件、外圍 接口、處理器/存儲系統之間進行互聯。PCI 的信號定義包括兩部份(如下圖):必 須的(左半部份)與可選的(右半部份)。其中“# ”代表低電平有效。
標簽: pcb設計
上傳時間: 2022-02-06
上傳用戶:得之我幸78