Include
External code is pasted into a program using the #include directive.
Contents
Description
To re-use external code in a program, the corresponding header file must be pasted in. This is handled by the compiler when it reaches an #include directive.
To include a standard library file, try #include <foo.h>.
#include <stdio.h>
int main() {
printf("Hello World!\n");
return 0;
}To include a user-created file, try #include "foo/bar.h". The compiler searches for this file in the current directory first, then scans search paths.