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Unit 6 THE COMPUTERPROGRAMMING LANGUAGES Lesson 20 Visual Basic Visual Basic VB is a fast visual procedure developingsoftware that Microsoft produced. Supported by the monopoly ofMicrosoft in the Operating System and office software Visual Basicsweeps across the whole world within a few years. Visual Basic is theextremely characteristic and powerful software mainly showing inthe following aspects: the interface design of WYSWYG object-oriented design method extremely short development periodformulation code relatively apt to maintain. BASIC is an acronym for Beginners’ All-purpose SymbolicInstruction Code. BASIC was developed in the early 1960s atDartmouth College by John Kemeny and Thomas Kurtz as a teachinglanguage. It largely remained as a teaching language until theintroduction of microcomputer systems in the mid-1970s.BASIC was selected as the high-level language for such systems dueto its simplicity and “compactness” in memory compared to otherHigh-Level Language. The rapid growth of microcomputer systemssince the late 1970s has now resulted in BASIC being very likely themost widely used computer language in the world. Such popularity has been at the expense of uniformity. ANSIdeveloped a standard BASIC however most microcomputer systemsuse their own particular implementation of BASIC. Visual Basic isjust the most widespread version of BASIC. This is largely becausemicrocomputer technology has advanced at a very rapid rate and thelanguage has been changed to take advantage of the capabilities ofthe hardware. The result is that someone being able to program in theBASIC used by one computer system such as Apple may be unableto program in the BASIC used by another computer system such asIBM. The basic means of computation in BASIC is the modificationof variables. It is based on statements assignments in particular thatinfluence subsequent computation by changing the value of memory.Word Bankmonopoly n.垄断 垄断者 专利权 专利事业sweep v.扫 打扫 清扫 席卷 冲光 扫过 掠 过WYSWY: “what you see what you get”,所见即所得object-oriented adj.面向对象的apt adj.易于…的 有…倾向的 灵敏的 灵 巧的 适当的 切题的 敏捷 倾向是maintain vt.维持 维修 继续 供养 主张all-purpose adj.通用的 多用途的Symbolic Instruction 符号指令code n.代码 代号 密码 编码 v.编码remain vi.保持 逗留 剩余 残存High-Level Language 高级语言due to 由于 应归于simplicity n.简单简易朴素直率compactness n.紧密 简洁result in 导致at the expense of 归…付费 在损害…的情况下uniformity n.同样 一式 一致 均匀ANSI 美国国家标准化组织particular n.细节 详细 adj.特殊的 特别的 独特的 详细的 精确的 挑剔implementation n.执行widespread adj.分布广泛的 普遍的advance n.前进 提升 预付款 v.前进 提前 预付 adj.前面的 预先的take advantage of 利用variable n.【数】变数 可变物 adj.可变的 【数】变量的statement n.声明 陈述 综述assignment n.分配 委派 任务 课外作业influence n.影响 感化 有影响的人或事 vt.影 响 改变subsequent adj.后来的 并发的 Notes1.BASIC was selected as the high-level language for such systems due to its simplicity and “compactness” in memory compared to other high-level language. BASIC被选作这种系统的高级语 言,是因为它