沒(méi)前言
單鏈表的初始化 1.結(jié)構(gòu)體鏈表的節(jié)點(diǎn)需要一個(gè)數(shù)據(jù)域和一個(gè)指針域,指針用來(lái)連接各節(jié)點(diǎn)
typedef struct Linklist
{int key;
struct Linklist* next;
}List;
2.初始化初始化需要一個(gè)頭節(jié)點(diǎn)(List* head),通過(guò)它來(lái)連接多個(gè)節(jié)點(diǎn).
先分配空間(malloc),再對(duì)相應(yīng)的參數(shù)賦值(NULL,key).(頭節(jié)點(diǎn)可以不用存儲(chǔ)數(shù)據(jù))
List* Initlist(List*head,int key)
{head = (List*)malloc(sizeof(List));
head->next = NULL;
head->key = key;
return head;
}
單鏈表節(jié)點(diǎn)的建立鏈表的建立首先需要建立新的節(jié)點(diǎn),用頭插和尾插兩種方式插入到鏈表中,建立的函數(shù)需要
一個(gè)數(shù)(key)和頭節(jié)點(diǎn).
List* setList(List* head, int key)
{List* node = (List*)malloc(sizeof(List));
node->key = key;
}
上述這是兩種建立(或插入)的通用的方式,接下來(lái)詳細(xì)分別介紹這兩種插入方式
1.尾插尾插是按照順序頭節(jié)點(diǎn)依次往下建立,需要一個(gè)工具指針(end)隨新節(jié)點(diǎn)建立而移動(dòng)
從而保證頭指針不動(dòng)(尾指針使用全局變量即可).下面是使用processon作圖表示鏈
接過(guò)程(用箭頭表示指針,省略數(shù)據(jù))
end->next = node; //
node->next = NULL;
end = node;
頭插和尾插不同之處在于頭插不需要移動(dòng)的指針(end),插入的節(jié)點(diǎn)從頭結(jié)點(diǎn)開(kāi)始
(node2為新節(jié)點(diǎn)node)
node->next = head->next;
head->next = node;
查找查找需要頭節(jié)點(diǎn)(head)和所要查找的數(shù)據(jù)(key),返回類型int為該數(shù)據(jù)在鏈表的位置
int find(List* head,int key)
{int i = 0;
while(head!=NULL)
{if(head->key)
{ return i;
}
head = head->next;
i++;
}
return -1;
}
修改修改操作需要一步查找操作,
List* modify(List* head,int key,int data)//key需要替換成data.
{int index = find(head,key);
if(index == -1)
{ printf("Not Found");
return;
}
else
{List* temp = head;
for(int i = 0; i< index; i++)
{ head = head->next;
}//指針移動(dòng)到目標(biāo)節(jié)點(diǎn).
head->key = data;
return temp;
}
}
刪除List* delete_node(List* head,int key)
{int index = find(head,key);
if(index == -1)
{ printf("Not Found");
return;
}
else
{if(head->key == key)
{ List* temp = head->next;
free(head);
return temp;
}
else
{ List* temp = head;
while(temp->next!=NULL)//移動(dòng)到目標(biāo)節(jié)點(diǎn)前一個(gè)節(jié)點(diǎn)
{if(temp->next->key == key)
{break;
}
temp = temp->next;
}
List* free_node = temp->next;
temp->next = temp->next->next;
free(free_node);
return head;
}
}
}
添加在某數(shù)據(jù)后添加一個(gè)新節(jié)點(diǎn)
List* insert(List* head,int key,int data)
{int index = find(head,key);
if(index == -1)
{ printf("Not Found");
return;
}
else
{ List* temp = head;
for(int i = 0; i< index; i++)
{ head = head->next;
}//指針移動(dòng)到目標(biāo)節(jié)點(diǎn).
List* node = (List*)malloc(sizeof(List));
node->next = head->next;
head->next = node;
node->key = data;
return temp;
}
}
打印void print(List* head)
{while(head!=NULL)
{printf("%d ",head->key);
head = head->next;
}
printf("\n");
}
代碼呈現(xiàn)#include#includetypedef struct Linklist
{int key;
struct Linklist* next;
}List;
List* end;
List* Initlist(List* head, int key);
List* setList(List* head, int key);
int find(List* head, int key);
List* modify(List* head, int key, int data);
void print(List* head);
List* insert(List* head, int key, int data);
List* delete_node(List* head, int key);
int main(void)
{List* head = {NULL};
head = Initlist(head,1);
head = setList(head, 2);
head = setList(head, 3);
head = setList(head, 4);
head = setList(head, 5);
head = setList(head, 6);
print(head);
head = insert(head, 5, 99);
print(head);
head = delete_node(head, 5);
print(head);
head = modify(head, 6, 666);
print(head);
}
List* Initlist(List* head, int key)
{head = (List*)malloc(sizeof(List));
head->next = NULL;
head->key = key;
end = head;
return head;
}
List* setList(List* head, int key)
{List* node = (List*)malloc(sizeof(List));
node->key = key;
node->next = NULL;
end->next = node;
end = node;
return head;
}
int find(List* head, int key)
{int i = 0;
while (head != NULL)
{if(head->key==key)
{ return i;
}
head = head->next;
i++;
}
return -1;
}
List* modify(List* head, int key, int data)//key需要替換成data.
{int index = find(head, key);
if (index == -1)
{printf("Not Found");
return;
}
else
{List* temp = head;
for (int i = 0; i< index; i++)
{ head = head->next;
}//指針移動(dòng)到目標(biāo)節(jié)點(diǎn).
head->key = data;
return temp;
}
}
void print(List* head)
{while (head != NULL)
{printf("%d ", head->key);
head = head->next;
}
printf("\n");
}
List* insert(List* head, int key, int data)
{int index = find(head, key);
if (index == -1)
{printf("Not Found");
return;
}
else
{List* temp = head;
for (int i = 0; i< index; i++)
{ head = head->next;
}//指針移動(dòng)到目標(biāo)節(jié)點(diǎn).
List* node = (List*)malloc(sizeof(List));
node->next = head->next;
head->next = node;
node->key = data;
return temp;
}
}
List* delete_node(List* head, int key)
{int index = find(head, key);
if (index == -1)
{printf("Not Found");
return;
}
else
{if (head->key == key)
{ List* temp = head->next;
free(head);
return temp;
}
else
{ List* temp = head;
while(temp->next != NULL)//移動(dòng)到目標(biāo)節(jié)點(diǎn)前一個(gè)節(jié)點(diǎn)
{ if (temp->next->key == key)
{break;
}
temp = temp->next;
}
List* free_node = temp->next;
temp->next = temp->next->next;
free(free_node);
return head;
}
}
}
運(yùn)行結(jié)果為
新人第一次寫博客,如有錯(cuò)誤,可以聯(lián)系作者改正,如有更好的方式,也歡迎交流(?′?`?)
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