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用C语言编通讯录程序（初学者级别的）(4) suc = pre->next;
}
if (suc) {
if (suc->next)
suc->next->pre = pre;
pre->next = suc->next;
free(suc->name);
free(suc->address);
free(suc->phone);
free(suc->zip);
free(suc);
modified = 1;
}
else
printf("Not found !\n");
}
void display( ADDR *ptr )
{
printf("\n\t名 : %s\n", ptr->name);
printf("\t地址 : %s\n", ptr->address);
printf("\t邮编 : %s\n", ptr->zip);
printf("\t电话 : %s\n", ptr->phone);
}
/* 告知命令用法 */
void usage()
{
printf("\n命令表:\n");
printf("i : 插入一条新的通信录.\n");
printf("f : 按输入名寻找通信录.\n");
printf("d : 按输入名删除一条通信录.\n");
printf("s : 浏览通信录.\n");
printf("q : 退出.\n");
}
/* 保存通信录到文件 */
void save(ADDR *head, char *fname)
{
FILE *fp;
ADDR *p;
p = head->next;
if ((fp = fopen(fname, "w")) == NULL) {
fprintf(stderr, "Can't open %s.\n", fname);
return;
}
while (p != NULL) {
fprintf(fp, "%s\n%s\n%s\n%s\n", p->name, p->address, p->zip, p->phone);
p = p->next;
}
fclose(fp);
}
/* 从文件读出通信录，建立双向链表 */
ADDR *load(char *fname)
{
ADDR *p, *h;
h = (ADDR *)malloc(sizeof(ADDR));
h->pre = NULL;
h->next = NULL;
if ((fp = fopen(fname, "r")) == NULL)
return h; /* 原先没有文件，返回空链表 */
while (!feof(fp)) {
p = (ADDR *)malloc(sizeof(ADDR));
if(getstr(fp, &p->name) == 0) {
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