#include <stdio.h> #include <stdlib.h> typedef struct Node {     int data;     struct Node *next; } Node; void getInfo(Node * node); int printNodes(Node *node); void saveToFile(Node * node, char * filename); void readFromFile(char * filename, int n); Node nodes[20]; int main() {     Node *first = (Node *) malloc(sizeof(Node));     first->data = 1;     first->next = NULL;     getInfo(first);     int numbers = printNodes(first);     saveToFile(first, "D:/123123");     readFromFile("D:/123123", numbers);     return 1; } void getInfo(Node * node) {     Node *last = node;     char ch = 0;     while ((ch = getchar()) != 'x') {         Node *newNode = (Node *) malloc(sizeof(Node));         newNode->data = ch - 'a';         newNode->next = NULL;         last->next = newNode;         last = newNode;     } } int printNodes(Node * node) {     int i = 1;     Node *p = node;     while (p != NULL ) {         printf("%d,", p->data);         p = p->next;         i++;     }     return i; } void saveToFile(Node * node, char * filename) {     Node *p = node;     FILE *fp;     if ((fp = fopen(filename, "wb")) == NULL ) {         return;     } else {         while (p != NULL ) {             fwrite(p, sizeof(Node), 1, fp);             p = p->next;         }     }     fclose(fp); } void readFromFile(char * filename, int n) {     int i = 1;     FILE *fp;     if ((fp = fopen(filename, "rb")) == NULL ) {         return;     } else {         while (i < n) {             Node *newNode = (Node *) malloc(sizeof(Node));             fread(newNode, sizeof(Node), 1, fp);             printf("--%d,",newNode->data);             i++;         }     } }