计算机专业英语(软件4).ppt
计算机专业英语,张起荣,Unit Two Software,Keywords：compiler 编译器maximum最大值procedural 过程化的low-levele低级，底层assembly language汇编语言cross-platform跨平台source code源代码,Passage Four C Language,Unit Two Software,Keywords：embedded system 嵌入式系统code portability 代码移植性system resource 系统资源interpreted languages解释型语言stability稳定性availability可用性,Passage Four C Language,Unit Two Software,Keywords：machine-specific针对于特定机器的 abstraction抽取，解析overhead 开销algorithm算法struct结构体union联合体enum枚举,Passage Four C Language,Unit Two Software,Keywords：variable变量function函数operand操作数operator操作符syntax语法loop 循环libraries库文件comment 注释,Passage Four C Language,Unit Two Software,Keywords：terminate结束load加载eidt编辑run运行equal相等，等于default缺省,Passage Four C Language,Word-building：super-前缀，意思为超级的。例如：supercomputer 超级计算机 supermarket 超级市场,Passage Four C Language,Unit Two Software,Word-building：动词+ment=名词 例如：implement实现（v）implementation实现（n）move移动(v)movement移动(n),Passage Four C Language,Unit Two Software,Word-building：动词+ation=名词例如：compute实现（v）computation实现（n）initialize 初始化（v）initialization初始化（n）,Passage Four C Language,Unit Two Software,Word-building：ability，后缀，指的能力，可性。例如：portability可移植性availability可用性 stability 稳定性expandability可扩展性maintainability可维护性,Passage Four C Language,Unit Two Software,Word-building：dis-,前缀，表示破坏或者否定例如：continue 继续 discontinue中断,中止 connect 连接 disconnect 切断,断开,Passage Four C Language,Unit Two Software,Sentences：It was designed to be compiled using a relatively straightforward compiler,to provide low-level access to memory,to provide language constructs that map efficiently to machine instructions,and to require minimal run-time support.,Passage Four C Language,Unit Two Software,Sentences：C was therefore useful for many applications that had formerly been coded in assembly language.,Passage Four C Language,Unit Two Software,Sentences：One consequence of Cs wide acceptance and efficiency is that compilers,libraries,and interpreters of other programming languages are often implemented in C.,Passage Four C Language,Unit Two Software,Sentences：Due to its thin layer of abstractionand low overhead,C allows efficient implementations of algorithms and data structures,which is useful for programs that perform a lot of computations.,Passage Four C Language,Unit Two Software,Sentences：First,if the variable count were initially set to any number greater than 5,the statements within the loop would not be executed at all,so it is possible to have a while loop that never is executed.,Passage Four C Language,Unit Two Software,Sentences：In nearly any context in C,a simple statement can be replaced by a compound statement that will be treated as if it were a single statement as far as program control goes.,Passage Four C Language,Unit Two Software,Sentences：The following is a program that generates a list of centigrade and Fahrenheit temperatures and printsa message out at the freezing point of water and another at the boiling point of water.,Passage Four C Language,Unit Two Software,Sentences：You will also notice that the printf statements that are in the if statements within the big for loop are indented three additional spaces because they are part of another construct.,Passage Four C Language,Unit Two Software,
