將鍊錶所寫通訊錄存入檔案儲存

#include #include #include #include struct person				//定義結構體，儲存聯絡人資訊

;struct people
;typedef struct person person;
typedef struct person * link;
typedef struct people people;
typedef struct people * plink;
void release(link* head) //清空通訊錄（釋放頭結點以外的所有結點）
}int create_node(link * newnode) //創立結點
}while(!*newnode);
return -1; 
}void createlink(link * head) //建立帶表頭結點的鍊錶
(*head)->next = null;
}void add(link head, link newnode) //新增聯絡人
else
p = p->next;
} while(strlen(newnode->tel) != 11)
newnode->tel[11] = '\0'; }}
void delete(link head) //刪除聯絡人
q = p;
p = p->next;
} if(p == null) 
}void find(link head) //查詢聯絡人
return;
} if(p == null) }
void modify(link head) //修改聯絡人
p = p->next;
} if(p = null) 
}int length(link head) //計算聯絡人個數
return count;
}void sort(link head) //根據姓名大小，用冒泡法排序
p = p->next;
q = q->next;
} }}void display(link head) //顯示排序後的所有聯絡人資訊
else }
}void menu() //功能選單
void function(char ch, link head, link newnode) //各選項對應的功能呼叫
else if(strcmp(ch,"2") == 0 )
else if(strcmp(ch,"3") == 0)
else if(strcmp(ch,"4") == 0)
else if(strcmp(ch,"5") == 0)
else if(strcmp(ch,"6") == 0) }
void read_to_link(link head)
fseek(fp,0,seek_end);
i = ftell(fp);
fseek(fp,0,seek_set);
num = i / sizeof(people); //獲取聯絡人個數
people str[100];
ret = fread(str,sizeof(people),num,fp);
if(!ret)
while(num-- > 0)
strcpy(q->name, str[j].name);
strcpy(q->tel, str[j].tel);
strcpy(q->addr, str[j].addr);
p->next = q;
q->next = null;
p = q;
j++;
} fclose(fp);
}void write_to_file(link head, int len)
while(p != null)
p = p->next;
i++;
} fclose(fp);
}int main()
if(strcmp(ch,"1") < 0 || strcmp(ch,"7") > 0) 
}return 0;
}

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