Mastering Go - Second Edition

Calling C code from Go using the same file

The simplest way to call C code from a Go program is to include the C code in your Go source file. This needs special treatment but it is pretty fast and not that difficult.

The name of the Go source file that contains both C and Go code is cGo.go and will be presented in three parts.

The first part is next:

package main 
 
//#include <stdio.h> 
//void callC() { 
//    printf("Calling C code!\n"); 
//} 
import "C" 

As you can see, the C code is included in the comments of the Go program. However, the go tool knows what to do with these kind of comments because of the use of the C Go package.

The second part of the program has the next Go code:

import "fmt" 
 
func main() { 

So, all the other packages should ...