這是我的插入排序代碼,經由節點的CString成員排序。當前的代碼只在頭部之前插入。封裝在註釋中的代碼是我正在嘗試工作的排序插入。我想我必須使用前任和繼任者的指針,但也許這是困惑我的比較。任何幫助,將不勝感激。謝謝!鏈表:字符串插入排序
#include <iostream>
#include "groclist.h"
void insert_item(Grocery_Item_Ptr &head, int quantity, const char name[])
{
bool exists = false;
bool done = false;
Grocery_Item_Ptr temp = NULL;
Grocery_Item_Ptr current = NULL;
Grocery_Item_Ptr pred = NULL;
Grocery_Item_Ptr succ = NULL;
if (head == NULL) {
head = new Grocery_Item;
head->quantity = quantity;
strncpy(head->name, name, MAX_ITEM_NAME_LEN);
head->next = NULL;
return;
}
else {
current = head;
while (current != NULL) {
if (strncmp(current->name, name, MAX_ITEM_NAME_LEN) == 0) {
current->quantity += quantity;
exists = true;
}
current = current->next;
}
if (exists) {
current = NULL;
return;
}
else {
current = head;
}
if (!exists) {
temp = new Grocery_Item;
temp->quantity = quantity;
strncpy(temp->name, name, MAX_ITEM_NAME_LEN);
/*
while (!done || current != NULL) {
if (strncmp(current->name, name, MAX_ITEM_NAME_LEN) < 0) {
pred = current;
succ = current->next;
current->next = temp;
temp->next = succ;
done = true;
}
if (!done) {
current = current->next;
}
}
*/
temp->next = head;
head = temp;
temp = NULL;
}
}
return;
}