preprocessor

简明释义

英[/ˈpriːˌprɒsɛsər/]美[/ˈpriːˌprɒsɛsər/]

n. 预处理器；[计] 预处理程序

英英释义

单词用法

同义词

反义词

例句

1.A. This is a directive to the preprocessor, which runs when you call your compiler.

这是给预处理器的一个指示，当你调用编译器的时候运行。

2.More information about C preprocessor macro programming is available in the CPP manual (see the Resources section for a link).

更多有关C 预处理器宏编程的内容可以在CPP手册中看到（请参阅 参考资料一节中的链接）。

3.Source files in the Linux subdirectory could have a code layout with preprocessor directives as follows.

linux子目录中的源文件中可能会有带有预处理程序指示符的代码形式，如下。

4.The contents of an entire OMG IDL file, along with any files brought in through preprocessor directives, form a naming scope.

整个OMGIDL内容和通过预处理器伪指令传入的所有文件共同组成了命名作用域。

5.For example, one model may simply be a preprocessor that produces J2EE 1.4 compatible web service artifacts.

例如，一个模型可以就是产生符合J2EE 1.4的Web服务构件的预处理器。

6.You cannot use preprocessor macros with arguments as value definitions.

不能将具有参数的预处理器宏用作值定义。

7.Using a preprocessor 预处理器 can help manage complex build configurations.

使用预处理器可以帮助管理复杂的构建配置。

8.The preprocessor 预处理器 can optimize the code before it is compiled.

在编译之前，预处理器可以优化代码。

9.A common use of a preprocessor 预处理器 is to include header files in a program.

一个常见的预处理器用途是在程序中包含头文件。

10.In C programming, the preprocessor 预处理器 handles directives like #include and #define.

在C语言编程中，预处理器处理像 #include 和 #define 这样的指令。

11.The preprocessor 预处理器 can remove comments from the source code.

预处理器可以从源代码中删除注释。

作文

In the world of computer programming, efficiency and optimization are key factors that can significantly influence the performance of software applications. One essential tool that programmers often utilize to enhance their code is the preprocessor. A preprocessor is a program that processes source code before it is compiled into an executable file. Its primary function is to prepare the code for compilation by performing various transformations and substitutions. This not only streamlines the coding process but also helps in managing complex projects more effectively.The use of a preprocessor can be particularly beneficial in scenarios where code needs to be reused across multiple files or projects. For instance, in C and C++ programming languages, the preprocessor allows developers to include header files, which contain declarations and macro definitions that can be shared among different source files. By using directives like #include, programmers can avoid redundancy and maintain cleaner code. This modular approach not only saves time but also reduces the chances of errors that may arise from duplicating code.Moreover, a preprocessor can facilitate conditional compilation. This feature enables developers to include or exclude parts of the code based on specific conditions, which can be particularly useful when targeting different platforms or configurations. For example, a programmer might want to compile certain code only for Windows users while excluding it for Linux users. Through the use of directives such as #ifdef and #ifndef, the preprocessor allows for greater flexibility in code management and ensures that the final output is tailored to the intended audience.Another significant advantage of using a preprocessor is its ability to define macros. Macros are essentially shorthand representations of code snippets that can be reused throughout the program. By defining a macro with the #define directive, programmers can write less code and make their programs easier to read and maintain. For instance, instead of writing a long mathematical formula multiple times, a developer can define it once as a macro and use it throughout the code, thereby enhancing clarity and reducing the risk of mistakes.However, while preprocessors offer numerous benefits, they also come with some drawbacks. One of the main concerns is that excessive use of macros can lead to code that is difficult to debug and understand. Since macros are expanded inline during preprocessing, they can obscure the flow of the program and make it hard for other developers to track down issues. Therefore, it is essential to use them judiciously and ensure that the code remains comprehensible.In conclusion, the preprocessor is a powerful tool in the arsenal of any programmer. Its ability to streamline code, facilitate conditional compilation, and define macros makes it invaluable for optimizing software development. However, like any tool, it should be used wisely to avoid complications. Understanding the role of the preprocessor and its functionalities can significantly enhance a programmer's effectiveness and contribute to the overall quality of software applications. As technology continues to evolve, the importance of mastering tools such as the preprocessor will remain paramount in the pursuit of efficient and robust programming practices.

在计算机编程的世界中，效率和优化是可以显著影响软件应用程序性能的关键因素。程序员经常利用的一种重要工具是预处理器。预处理器是一种在源代码编译成可执行文件之前处理源代码的程序。它的主要功能是在编译之前通过执行各种转换和替换来准备代码。这不仅简化了编码过程，还帮助更有效地管理复杂项目。在需要在多个文件或项目中重用代码的情况下，使用预处理器特别有益。例如，在C和C++编程语言中，预处理器允许开发人员包含头文件，这些头文件包含可以在不同源文件之间共享的声明和宏定义。通过使用像#include这样的指令，程序员可以避免冗余并保持代码更整洁。这种模块化的方法不仅节省了时间，而且减少了因重复代码而可能出现的错误。此外，预处理器能够促进条件编译。这一特性使得开发人员能够根据特定条件包含或排除部分代码，这在针对不同平台或配置时尤为有用。例如，程序员可能希望仅为Windows用户编译某些代码，同时将其从Linux用户中排除。通过使用像#ifdef和#ifndef这样的指令，预处理器允许更大的灵活性来管理代码，并确保最终输出符合预期受众的需求。使用预处理器的另一个显著优势是它能够定义宏。宏本质上是代码片段的简写表示，可以在整个程序中重用。通过使用#define指令定义宏，程序员可以编写更少的代码，使程序更易于阅读和维护。例如，开发人员可以将一个冗长的数学公式定义为宏，而不是多次编写，从而提高了清晰度并减少了错误的风险。然而，虽然预处理器提供了许多好处，但它们也带来了一些缺点。主要的担忧之一是过度使用宏可能导致代码难以调试和理解。由于宏在预处理期间内联扩展，它们可能会模糊程序的流程，使其他开发人员难以追踪问题。因此，有必要明智地使用它们，以确保代码保持可理解性。总之，预处理器是任何程序员工具箱中的强大工具。它简化代码、促进条件编译和定义宏的能力使其在优化软件开发方面不可或缺。然而，像任何工具一样，应该明智地使用它，以避免复杂情况。理解预处理器的角色及其功能可以显著提高程序员的工作效率，并有助于软件应用程序的整体质量。随着技术的不断发展，掌握像预处理器这样的工具的重要性将在追求高效和稳健的编程实践中保持重要。