program10-10.c

// Returning a Pointer from a Function

#include <stdio.h>

struct entry
{
    int value;
    struct entry *next;
};

struct entry *findEntry(struct entry *listPtr, int match)
{

    while (listPtr != (struct entry *) 0)
        if (listPtr->value == match)
            return (listPtr);
        else
            listPtr = listPtr->next;

  return (struct entry *) 0;
}

int main(void)
{
    struct entry *findEntry(struct entry *listPtr, int match);
    struct entry n1, n2, n3;
    struct entry *listPtr, *listStart = &n1;

    int search;

  n1.value = 100;
  n1.next = &n2;

  n2.value = 200;
  n2.next = &n3;

  n3.value = 300;
  n3.next = 0;

  printf("Enter value to locate: ");
  scanf("%i", &search);

  listPtr = findEntry(listStart, search);

  if (listPtr != (struct entry *) 0)
      printf("Found %i.\n", listPtr->value);
  else
      printf("Not found.\n");

  return 0;
}