products.c

#include <stdio.h>
#include <stdlib.h>

typedef enum supermarket_t {
  COLES, WOOLIES, ALDI
} supermarket_t;

typedef struct product_t {
  char *name;
  float price;
  supermarket_t shop;
  struct product_t *goes_nice_with;
} product_t;

int main(int argc, char const *argv[]) {
  product_t cheese, crackers, wine;

  cheese.name = "Camembert";
  cheese.price = 5.60;
  cheese.shop = COLES;
  cheese.goes_nice_with = &crackers;

  crackers.name = "Savoy";
  crackers.price = 1.20;
  crackers.shop = COLES;
  crackers.goes_nice_with = &cheese;

  wine.name = "Merlot";
  wine.price = 6.90;
  wine.shop = ALDI;
  wine.goes_nice_with = &cheese;

  printf("%s goes nice with %s\n", cheese.name, cheese.goes_nice_with->name);
  printf("%s goes nice with %s\n", crackers.name, crackers.goes_nice_with->name);
  printf("%s goes nice with %s\n", wine.name, wine.goes_nice_with->name);

  return 0;
}