鏈表在main函數裏寫是一回事,封裝成獨立函數會有新問題…
#include<bits/stdc++.h>
using namespace std;
struct Node ///(結點形式)
{
int data; ///數據域
struct Node * next; ///指針域
};
typedef struct Node def;
def * CreateLink(int LinkNumber, int data[])
{
///建立第一個結點(絕非 so-called “頭結點”,所謂的”頭結點“不是結點,是指針!)
def * start = new def;
///結點沒有名字,賦值時只能 對 指向它的指針“解引用”來賦值
start -> data = data[0];
start -> next = NULL;
def * head, * pre;///我們暫且稱其“頭指針”、“前指針”
head = start;///賦址,頭指針指向第一個結點(永恆不變)
for (int i = 1; i < LinkNumber; ++i)
{
pre = start;///下一步是建立新結點,我們把新節點稱爲“當前結點”,所以此時pre指向的是前一結點
start = new Node;
pre -> next = start;///前一結點指針指向當前結點
start -> data = data[i];///當前結點數據賦值
if(i == LinkNumber - 1)
start -> next = NULL;///尾結點置空
}
return head;
}
int main()
{
int a[3] = {10, 20, 30};
def * p = CreateLink(3, a);
for( ; p -> next != NULL; p = p -> next)
cout << p -> data << '\n';
cout << p -> data << '\n';
return 0;
}