# Preprocessing \(in C/C\+\+ language\)

Preprocessing \(in C/C\+\+ language\)\. The mechanism which reviews the input "\.c/\.cpp" file, executes the preprocessor's directives in it, includes the content of other files listed in \#include directives into it etc\. As the result you get a file which does not contain the preprocessor's directives, all the used macros are opened and instead of \#include directives the content of the corresponding files is substituted\. The file with the result of preprocessing usually has "\.i" suffix\. The result of preprocessing is called a translation unit\.

## References

1. Brian W\. Kernighan and Dennis M\. Ritchie\. [ The C programming Language\. Appendix A12](https://en.wikipedia.org/wiki/The_C_Programming_Language)