Although the compiler does not have a separate preprocessor, the directives described in this section are processed as if there were one. They are used to help in conditional compilation. Unlike C and C++ directives, you cannot use these directives to create macros....
In C programming, you can instruct the preprocessor whether to include a block of code or not. To do so, conditional directives can be used. It's similar to aifstatement with one major difference. Theifstatement is tested during the execution time to check whether a block of code should ...
which would result in 1 * 5 being evaluated before the addition, not after. Oops! It is also possible to write simply 1 #define [identifier name] which defines [identifier name] without giving it a value. This can be useful in conjunction with another set of directives that allow con...
This modification is done according to the preprocessor directives that are included in the source files. The directives are easily distinguished from other programming code in that they start with a hash sign (#). They must always appear as the first non-whitespace character on a line, and ...
That’s common to all the preprocessor directives. If a line starts with #, that’s taken care by the preprocessor.ConditionalsOne of the things we can do is to use conditionals to change how our program will be compiled, depending on the value of an expression....
For example, you can find include directives (#include) at the beginning of most source files. The preprocessor is a system that rewrites the source before the actual compiler sees it. Clearly, this is a very powerful tool—the downside is that you could accidentally shoot yourself in the ...
9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook preprocessor Encyclopedia Wikipedia pre·proc·ess (prē-prŏs′ĕs′, -prō′sĕs′) tr.v.pre·proc·essed,pre·proc·ess·ing,pre·proc·ess·es ...
9.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。 10.Speech Synthesis must text preprocessor, which is the only one of the revenue code. ...
The GNU C preprocessor is used by the gcc compiler to preprocess the source files.In the preceding link, you can find how the preprocessor parses the directives and how it creates the parse tree. The document also provides an explanation of the different macro expansion algorithms. While it ...
Location directives are the same as in OCaml and are echoed in the output. They consist of a line number optionally followed by a file name: #123#456"source" Messages Warnings and error messages can be produced by the preprocessor: