double links....baoyuzuoye

Posted by Cww97 on 2016-03-22

版权声明:本文为博主原创文章,未经博主允许不得转载。原文所在http://blog.csdn.net/cww97 https://blog.csdn.net/cww97/article/details/50959162
这里写图片描述

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#include<cstdio>//cww double links
#include<iostream>
using namespace std;
struct node{
int data;
node *next;
node *last;
node(){int data=0;node *next=NULL;node *last=NULL;}
}*head,*rear;

void append(int x){//push_back
node* p=new node;
p->data=x;//fill in the number
p->last=rear->last;
p->last->next=p;
rear->last=p;
p->next=rear;//该链的链上
}
//===============orders=====================
void build(){
head=new node;
rear=new node;
head->next=rear;
rear->last=head;
//now the links is empty
printf("How many numbers at the beginning:");
int n,x;scanf("%d",&n);
for (;n--;){
scanf("%d",&x);
append(x);//push_back
}
}
node* Find(node* head,int x){//find.....
node *p=head->next;
for (;p!=NULL;p=p->next){
if (p->data==x)return p;
}//just find ,nothing else
return NULL;
}
//===============get order====================
char getorder(){//获取指令
while (1){
printf("Select command and press<Enter>:");
char ch; cin>>ch;
if (ch=='f'||ch=='b'||ch=='q'||ch=='Q')return ch;
//ps:it's not a bad idea to add more fuctions
//such as insert....I'm lazy
puts("Please enter a valid command :");
puts("[b]build a new double link = =");
puts("[f]find x in the link you built");
puts("[Q]uit =======Bazinga!=========");
}//交互式的程序好烦
}
//===============main=fuction===============
bool solve(char ch){
if (ch=='q'||ch=='Q')return 0;//quit
if (ch=='b'){build();}//creat a new links
if (ch=='f'){//find
printf("Tell me what you want to find:");
int x;scanf("%d",&x);
node *p=new node;
p=Find(head,x); //find x
if (p=NULL)puts("Nowhere to be found");
else printf("%x\n",&p);//question:print what?
}
return 1;
}
//============cww=2016=3=22=22:17=============
int main(){
while (solve(getorder())){}
return 0;
}