线性表的顺序表示(C语言实现)

#include<stdio.h>
#include<malloc.h>

#define ERROR 0
#define OK 1
#define EQUAL 1
#define OVERFLOW -1
#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10

struct STU{
  char name[20];
  char stuno[10];
  int age;
  int score;
}stu[50];
typedef struct STU ElemType;

struct LIST
{
  ElemType *elem;
  int Length;
  int listsize;
};

typedef struct LIST List;

/*构造一个空的线性表L*/

int init(List *L)
{
  L->elem=(ElemType *)malloc(LIST_INIT_SIZE*sizeof(ElemType));
  if(!L->elem) exit(OVERFLOW);
  L->Length=0;
  L->listsize=LIST_INIT_SIZE;
  return OK;
}/*init */

/*返回L中数据元素的个数*/

int ListLength(List *L)
{
  return L->Length;
}

/*若线性表L存在,1<=i<=L.Length,用e返回L中第i个元素*/
void GetElem(List L,int i,ElemType *e)
{
  *e=L.elem[i];
}

int EqualList(ElemType *e1,ElemType *e2)
{
  if (strcmp(e1->name,e2->name)==0)
    return 1;
  else
    return 0;
}

/*判断元素的大小,通过元素的name字段*/

int Less_EqualList(ElemType *e1,ElemType *e2)
{
  if (strcmp(e1->name,e2->name)<=0)
    return 1;
  else
    return 0;
}

/*若cur_e是L的元素,且不是第一个,则用pre_e返回它的前驱*/

int PriorElem(List *La,ElemType cur_e,ElemType *pre_e)
{
  int i;            
  i=LocateElem(La,cur_e,EQUAL);
  {
     if (i>=1)
     {
       *pre_e=La->elem[i-1];  /*»òдΪLa->elem[i-1]*/
       return OK;
     } 
     else
     {
       return ERROR;
     }
  }
}

/*若cur_e是L的元素,且不是最后一个,则用next_e返回它的后继元素*/

int NextElem(List *La,ElemType cur_e,ElemType *next_e)
{
  int i;         
  if (LocateElem(La,cur_e,i))
  {
     if (i<=La->Length-1)
     {
       *next_e=(*La).elem[i+1];
       return OK;
     } 
     else
     {
       return ERROR;
     }
  }
}

/*返回线性表L中第一个与e满足关系type的位序*/

int LocateElem(List *La,ElemType e,int type)
{
  int i;
  switch (type)
    {
      case EQUAL:
 for(i=0;i<La->Length;i++)
   if(EqualList(&La->elem[i],&e))
     return i;
 break;
      default:
 break;
    }
  return 0;
}

/*从线性表L中删除第i个元素,并且删除的元素赋给e*/

int DeleteElem(List *L,int i,ElemType e)
{
  ElemType *p,*q; 
  if ((i<1) || (i>L->Length)) return ERROR;
  p=&L->elem[i-1];
  e=*p;
  q=L->elem+L->Length-1;  /* Also Write: q=&L->elem[0]+L->Length-1;*/
  for (++p;p<=q;++p)
    *(p-1)=*p;
  --L->Length;
  return OK; 
}

/*清空线性表L*/

void ClearList(List *L)
{
     L->Length=0;
}

/*销毁线性表L*/

int DestroyList(List *L)
{
    int i;
    for (i=0;i<=L->Length-1;i++)
      free(&L->elem[i]);
    L->Length=0;
}   

/*合并线性表La,Lb到Lc*/

void MergeList(List *La,List *Lb,List *Lc)
{
  ElemType *pa,*pb,*pc,*pa_last,*pb_last;
  pa=La->elem;pb=Lb->elem;
  Lc->listsize = Lc->Length = La->Length + Lb->Length;
  pc = Lc->elem = (ElemType *)malloc(Lc->listsize * sizeof(ElemType));
  if(!Lc->elem)   exit(OVERFLOW);
  pa_last = La->elem + La->Length - 1;
  pb_last = Lb->elem + Lb->Length - 1;
  while(pa<=pa_last && pb<=pb_last)
    {
      if(Less_EqualList(pa,pb))   *pc++=*pa++;
      else *pc++=*pb++;
    }
  while(pa<=pa_last) *pc++=*pa++;
  while(pb<=pb_last) *pc++=*pb++;
}

/*将所有在线性表Lb中但不早La中的数据元素插入到La中*/

void UnionList(List *La, List *Lb)
{
  int La_len,Lb_len;
  int i;
  ElemType e;

  La_len=ListLength(La);  Lb_len=ListLength(Lb);
  for(i=0;i<Lb_len;i++)
    {
      GetElem(*Lb,i,&e);
      if(!LocateElem(La,e,EQUAL))
 ListInsert(La,++La_len,e);
    }

}

/*打印线性表L*/

int printlist(List L)
{
  int i;
  printf("name       stuno        age     score\n");
  for(i=0;i<L.Length;i++)
      printf("%-10s %s\t%d\t%d\n",  L.elem[i].name,  L.elem[i].stuno,
   L.elem[i].age,  L.elem[i].score);
  printf("\n");
}

/*将元素e插入线性表L的第i个元素中*/

int ListInsert(List *L,int i,struct STU e)
{
  struct STU *p,*q;
  if (i<1||i>L->Length+1) return ERROR;
  q=&(L->elem[i-1]);
  for(p=&L->elem[L->Length-1];p>=q;--p)
    *(p+1)=*p;
  *q=e;
  ++L->Length;
  return OK;
}/*ListInsert Before i */

main()
{
  struct STU e,t,*k;
  List La,Lb,Lc,*L;
  int i;

  printf("\n\n-------------------List Demo is running...----------------\n\n");
  printf("First is InsertList function.\n");
  init(&La);

  strcpy(e.name,"stu1");
  strcpy(e.stuno,"100001");
  e.age=80;
  e.score=1000;
  ListInsert(&La,1,e);
  strcpy(e.name,"stu3");
  strcpy(e.stuno,"100002");
  e.age=80;
  e.score=1000;
  ListInsert(&La,2,e);

  printlist(La);
  printf("List A length now is  %d.\n\n",La.Length);
  getch();

  strcpy(e.name,"stu5");
  strcpy(e.stuno,"100003");
  e.age=80;
  e.score=1000;
  ListInsert(&La,3,e);

  printlist(La);
  printf("List A length now is  %d.\n\n",La.Length);
  getch();

  strcpy(t.name,"stu5");
  strcpy(t.stuno,"100003");
  t.age=80;
  t.score=1000;
  L=&La;
  i=LocateElem(L,t,EQUAL);
  printf("The position of t is %d\n",i);
 
  PriorElem(L,t,k);
  printf("The prior name is %s\n",k->stuno);
  getch();
 
  DeleteElem(&La,2,e);
  printlist(La);
  getch();
 
  DestroyList(&La);
  printlist(La);
  getch();
  init(&Lb);
  strcpy(e.name,"stu2");
  strcpy(e.stuno,"100001");
  e.age=80;
  e.score=1000;
  ListInsert(&Lb,1,e);
  strcpy(e.name,"stu4");
  strcpy(e.stuno,"100002");
  e.age=80;
  e.score=1000;
  ListInsert(&Lb,2,e);

  strcpy(e.name,"stu6");
  strcpy(e.stuno,"100001");
  e.age=80;
  e.score=1000;
  ListInsert(&Lb,3,e);

  printlist(Lb);
  printf("List B length now is  %d.\n\n",Lb.Length);
  getch();

  MergeList(&La,&Lb,&Lc);
  printlist(Lc);
  getch();

  printf("Second is UnionList function.\n");
  printf("Now union List A and List B.....\n");
  UnionList(&La,&Lb);
  printlist(La);
  printf("List A length now is  %d.\n\n",La.Length);
  getch();
  printf("\n\n\n\n\n\nWelcome to visit http://zmofun.heha.net !\n\n\n\n\n\n\n");
  getch();
}

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