题：编写程序实现单链表的插入。【美国某著名计算机嵌入式公司2005年面试题】
答案：完整代买如下：
// P167_example1.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <conio.h>
typedef struct student
{
int data;
struct student *next;
}node;
//建立单链表
node* create()
{
node *head,*p,*s;
int x, cycle = 1;
head = (node *)malloc(sizeof(node));
p = head;
while(cycle)
{
std::cout<<"please input the data: ";
std::cin>>x;
std::cout<<std::endl;
if(x != 0)
{
s = (node *)malloc(sizeof(node));
s->data = x;
p->next = s;
p = s;
}
else
cycle = 0;
}
head = head->next;
p->next = NULL;
return head;
}
//单链表测长
int length(node *head)
{
int n = 0;
node *p;
p = head;
while(p != NULL)
{
p = p->next;
n++;
}
return n;
}
//单链表打印
void print(node *head)
{
node *p;
int n;
n = length(head);
std::cout<<"Now, These "<<n<<" records are: "<<std::endl;
p = head;
if(p != NULL)
{
while(p != NULL)
{
std::cout<<p->data<<" -> ";
p = p->next;
}
std::cout<<std::endl;
}
}
//单链表删除结点
node* del(node *head, int num)
{
node *p1,*p2;
p1 = head;
while(num != p1->data && p1->next != NULL)
{
p2 = p1;
p1 = p1->next;
}
if(num == p1->data)
{
if(p1 == head)
{
head = p1->next;
free(p1);
}
else
{
p2->next = p1->next;
free(p1);
}
}
else
{
std::cout<<num<<" could not been found"<<std::endl;
}
return head;
}
//插入结点
node* insert(node *head, int num)
{
node *p0,*p1,*p2;
p1 = head;
p0 = (node *)malloc(sizeof(node)); //待插入的结点
p0->data= num;
while(p0->data > p1->data && p1->next != NULL)
{
p2 = p1;
p1 = p1->next;
}
if(p0->data < p1->data)
{
if(p1 == head)
{
p0->next = p1;
head = p0;
}
else
{
p0->next = p1;
p2->next = p0;
}
}
else
{
p1->next = p0;
p0->next = NULL;
}
return head;
}
int _tmain(int argc, _TCHAR* argv[])
{
node *head;
head = create();
print(head);
//删除结点
int num;
std::cin>>num;
head = del(head, num);
print(head); //打印删除后的单链表
//插入结点
std::cin>>num;
head = insert(head, num);
print(head);
return 0;
}
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