A preprocessor is a program that proccesses a file before it's passed down to the compiler and the linker. It permits to define some variables so that a programmer can change the program just by changing one line of code. It permits to include header files to.
The pre-processor is as its name implies; it changes or processes the source code of the programmer in certain ways before the compiler actually sees the code to compile. For example, if I have the following:
# define VAL 5
if (abc 5)
so it has "pre-processed" the statement before the compiler.
Another common reason for using a pre-processor is to bring in lines of code to describe a feature or function that is used commonly without having to re-write the code over and over. This is the result of using the # include statement.
There are other statements, such as #pragma, #ifdef, etc.,that can cause conditionalized code to be included or not, depending on environment, etc.
The program I work on must compile on multiple platforms; some times parts of the code would only compile under Windows, some times only under certain Unix platforms. The pre-processor allows me to keep a common set of code for all platforms.
A very useful feature ...
It's a command for the preprocessor. This makes perfect sense if you know what a preprocessor is, but otherwise probably not a lot.
In computer science, a preprocessor is a program that reads source code and makes certain changes to it before handing the result off to a compiler. The point of the preprocessor is to make writing code simpler, by allowing people to (for example) include the contents of a different file inside the file actually being processed, or to define a 'shortcut' for some expression that may be used several times in the program, saving the coder from having to write it out in full each time.
Preprocessor: All the preprocessor commands written in a high level language are processed by the preprocessor before compiler takes over.Example: "#define MAX_ROWS 10"Preprocessor finds all the places and replaces MAX_ROWS with 10 in the files of the project.Compiler: This software, converts the code written in high-level language into object file. Compiler converts all the files of a given project at once.
all preprocessor directives start with #(hash) symbol in both c & c++
If you're asking if the c preprocessor supports recursive macros, the answer is no. The preprocessor is single-pass and since the "function" must be defined before it can be referenced, it can not be recursive.
Yes.
#if, #define, #include just to name a few
As it is, PHP does not have a preprocessor; it is a preprocessor that processes form variables and other environmental variables and prints HTML or general text.
Because otherwise the preprocessor would ignore them.
Hypertext Preprocessor is PHP, it is a server side web programming language.
Preprocessor: All the preprocessor commands written in a high level language are processed by the preprocessor before compiler takes over.Example: "#define MAX_ROWS 10"Preprocessor finds all the places and replaces MAX_ROWS with 10 in the files of the project.Compiler: This software, converts the code written in high-level language into object file. Compiler converts all the files of a given project at once.
PHP: Hypertext Preprocessor
"PHP: Hypertext Preprocessor".
all preprocessor directives start with #(hash) symbol in both c & c++
Yes, it often does.
PreProcessor Hyptertext
You can use the preprocessor directive #define, or you can describe a variable in the body of main(). With the preprocessor directive you can make the variable accessible even out of your current project.
If you're asking if the c preprocessor supports recursive macros, the answer is no. The preprocessor is single-pass and since the "function" must be defined before it can be referenced, it can not be recursive.
Yes.