CGO is the tool that makes it possible to run C code in a Go application. This feature has been around since Go reached version 1.0 in 2009 and allowed us to use existing C libraries when there were fewer packages available outside the standard library than today.
The C code is accessed through the C pseudo package, and it is accessed and called using the package name followed by the identifier, for instance, C.print.
The import declaration is preceded by a series of special comments, which specify what C source file the application should import:
package example
// #include <stdio.h>
import "C"
This statement can also be a multiline comment, which can contain more include directives, like the one from the example earlier, and even actual C code directly:
package example
/*
#include <stdio.h>
#include <stdlib.h>
#include <...
