第二章 线性表-顺序表示-基本操作

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<algorithm>
#include<iostream>
#include<math.h>
using namespace std;
#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10
typedef int ElemType;
typedef struct{
    ElemType *elem;
    int length;
    int listsize;
    int incrementsize;
}SqList;
void InitList(SqList &L,int maxsize=LIST_INIT_SIZE,int incresize=LISTINCREMENT);
void DestoryList(SqList &L);
void increment(SqList &L);
void ClearList(SqList &L);
bool ListEmpty(SqList L);
int  ListLength(SqList &L);
void GetElem(SqList &L,int i,ElemType &e);
int  LocateELem(SqList &L,ElemType &e);
void PriorElem(SqList &L,ElemType cur_e,ElemType &pre_e);
void NextElem(SqList &L,ElemType cure_e,ElemType &next_e);
void ListInsert(SqList &L,int i,ElemType e);
void ListDelete(SqList &L,int i,ElemType &e);
void visit(ElemType e);
void ListTraverse(SqList L,void (*vi)(ElemType));
int main()
{
   SqList L;
   InitList(L);
   ElemType e1,e2;
   for(int i=1;i<=5;i++)
    ListInsert(L,i,i);                                            //ListInsert(),ListTraverse(),visit()
   cout<<"插入从五个元素后"<<endl;
   ListTraverse(L,visit);
   cout<<endl;
   int l=ListLength(L);                                          //ListLength()
   cout<<"线性表长度："<<l<<endl;
   cout<<"是否为空：";
   cout<<ListEmpty(L)<<endl;                                      //ListEmpty()
   ClearList(L);                                                  //ClearList()
   cout<<"清空之后是否为空:";
   cout<<ListEmpty(L)<<endl;
   for(int i=1;i<=5;i++)
    ListInsert(L,i,i);
   PriorElem(L,2,e1);                                             //PriorElem()
   cout<<" 2 的前驱:"<<e1<<endl;
   NextElem(L,2,e2);                                              //NextElem()
   cout<<" 2 的后继:"<<e2<<endl;
   ListDelete(L,2,e1);                                            //ListDelete()
   cout<<"删除第二个元素之后"<<endl;
   ListTraverse(L,visit);
   return 0;
}
void InitList(SqList &L,int maxsize,int incresize)
{
    L.elem=new ElemType[maxsize];
    if(!L.elem)
    {
        cout<<"no enough memory!"<<endl;
        exit(0);
    }
    L.length=0;
    L.listsize=maxsize;
    L.incrementsize=incresize;
}
void DestoryList(SqList &L)
{
    delete [ ]L.elem;
    L.elem=NULL;
    L.length=0;
    L.listsize=0;
}
void increment(SqList &L)
{
    ElemType *a;
    a=new ElemType[L.listsize+L.incrementsize];
    for(int i=0;i<L.length;i++)
        a[i]=L.elem[i];
    delete[] L.elem;
    L.elem=a;
    L.listsize+=L.incrementsize;
}
void ClearList(SqList &L)
{
    L.length=0;
}
bool ListEmpty(SqList L)
{
    if(!L.length)
        return true;
    else
        return false;
}
int ListLength(SqList &L)
{
    return L.length;
}
void  GetElem(SqList &L,int i,ElemType &e)
{
    if(i<1 || i>L.length)
    {
        cout<<"error"<<endl;
        exit(0);
    }
    e=L.elem[i];
}
int LocateELem(SqList &L,ElemType &e)
{
    int i=1;
    ElemType *p=L.elem;
    while(i<=L.length && *p++!=e) ++i;
    if(i<L.length) return i;
    else return 0;
}
void PriorElem(SqList &L,ElemType cur_e,ElemType &pre_e)
{
    if(*L.elem==cur_e)
    {
        cout<<"first element, no previous element"<<endl;
        return ;
    }
    else
    {
        int i=2;
        ElemType *p=L.elem+1;
        while(i<=L.length && cur_e!=*p)
        {
            p++;
            i++;
        }
        if(i>L.length)
        {
            cout<<"error"<<endl;
            return ;
        }
        else
        {
            pre_e=*--p;
        }
    }
}
void NextElem(SqList &L,ElemType cure_e,ElemType &next_e)
{
    int i=1;
    ElemType *p=L.elem;
    while(i<L.length && *p!=cure_e)
    {
        p++;
        i++;
    }
    if(i==L.length)
    {
        cout<<"error"<<endl;
        return ;
    }
    else
        next_e=*++p;
}
void ListInsert(SqList &L,int i,ElemType e)
{
    //i<=i<=L.length+1
    if(i<1 || i>L.length+1)
    {
        cout<<"i值不合法"<<endl;
        return ;
    }
    if(L.length>=L.listsize) increment(L);
    ElemType *q=&(L.elem[i-1]);
    ElemType *p=L.elem;
    for(p=&(L.elem[L.length-1]);p>=q;--p)
        *(p+1)=*p;
    *q=e;
    ++L.length;
}
void ListDelete(SqList &L,int i,ElemType &e)
{
    //在线性表中删除第i个元素，并用e返回其值
    //i的合法值为1<=i<=L.length
    ElemType *p=&(L.elem[i-1]);
    e=*p;
    ElemType *q=L.elem+L.length-1;
    for(++p;p<=q;++p)
        *(p-1)=*p;
    --L.length;
}
void visit(ElemType e)
{
    cout<<e<<"  ";
}
void ListTraverse(SqList L,void (*vi)(ElemType))
{
    ElemType *p;
    int i;
    p=L.elem;
    for(i=1;i<=L.length;i++)
        vi(*p++);
}