#include <stdio.h> #include <malloc.h> #include <string.h> struct address { 	int a; 	int b; 	char c; 	struct address *next; }; void SaveToFile(struct address *p, FILE *fp) { 	if(p != NULL) 	{ 		do 		{ 			fwrite(p, sizeof(struct address), 1, fp); 			p = p->next; 		} while(p != NULL); 	} } int load(FILE *fp, struct address **head){	int n=0; 	struct address *p1,*p2; 	*head = (struct address *) malloc(sizeof(struct address)); 	memset(*head, 0, sizeof(struct address)); 	if( fread(*head, sizeof(struct address), 1, fp) != 1) 	{ 		free(*head); 		*head = NULL; 		return(0); 	} 	p2 = *head; 	n++; 	while( !feof(fp)) 	{ 		p1 = (struct address *) malloc(sizeof(struct address)); 		fread(p1, sizeof(struct address), 1, fp); 		p2->next = p1; 		p2 = p1; 		n++; 	} 	p2->next = NULL; 	return(n); } void main() { 	struct address *head; 	struct address *Test[10] = {0}; 	int i = 0; 	FILE *fp = NULL; 	for(i=0; i < 10; i++) 	{ 		Test[i] = (struct address *)malloc(sizeof(struct address)); 		if(Test[i] != NULL) 		{ 			memset(Test[i], 0, sizeof(struct address)); 			Test[i]->a = 65 + i; 			Test[i]->b = 65 + i; 		} 	} 	for(i = 0; i < 10; i++) 	{ 		if(i < 10) 		{ 			Test[i]->next = Test[i+1];		} 	} 	if((fp = fopen("addrbook.txt", "wb")) != NULL) 	{ 		SaveToFile(Test[0], fp); 		fclose(fp); 	} 	if((fp = fopen("addrbook.txt", "rb")) != NULL) 	{ 		load(fp, &head); 	} }