macro concatnation example

macro3.c

#include <stdio.h>

struct command {
  char *name;
  void (*function)(void);
};


#define MKCMD(cmd) { #cmd, cmd ## _command }

void quit_command() {
  printf("quit command executed.\n");
}

void help_command() {
  printf("help command executed.\n");
}

int main() {
  struct command commands[] = {
    MKCMD(quit),
    MKCMD(help)
  };
  commands[0].function();
  commands[1].function();
  return 0;
}