顺序线性表的删除算法 C语言版

顺序线性表的删除算法:

算法部分:

Status ListDelete_Sq ( SqList &L, int i, ElemType &e ) {

// 在顺序线性表L中删除第 i 个元素，并用 e 返回其值，1≤i ≤ListLength_Sq (L)

if ( ( i < 1 ) || ( i > L.length ) ) return ERROR; // i 值不合法

p = &( L.elem [ i-1 ] ); // p 为被删除元素的位置

e = *p; // 被删除元素的值赋给 e

q = L.elem + L.length – 1; // 表尾元素的位置

for ( ++p; p <= q; ++p ) *(p-1) = *p; // 被删除元素之后的元素左移

--L.length; // 表长减 1

return OK;

} // ListDelete_Sq

C程序源代码部分:

//ListDelete_Sq.cpp
//Delete the NO.i Element of Sq_List and get the value

#include <stdlib.h>
#include <iostream.h>
#include <conio.h>
#include <stdio.h>

//#define LIST_INIT_LENGTH 10  //LIST_INIT_LENGTH is the Init_Define_Length of Sq_List
//int array[LIST_INIT_LENGTH]={5,8,12,18,25,30,37,46,51,89};
			    //array use to assign init value of SqList
#define ElemType int
#define LIST_INIT_SIZE 100
#define LISTINCREMENT 10
typedef struct 
{	int *elem;
	int length;
	int listsize;
}SqList;

int InitList_Sq(SqList &L)                                    //InitList_Sq() function
{   //Inititial a Sq_List
	L.elem=(int *)malloc(LIST_INIT_SIZE *sizeof(int));
	if (!L.elem) return(0);
	L.length=0;
	L.listsize=LIST_INIT_SIZE;
	return(1);
}//end of InitList_Sq() function

void ListDelete_Sq(SqList &L,int i, int &e)            //ListDelete_Sq() function
{
   int *p,*q;
   if((i<1)||(i>L.length))
       { cout<<i<<" is OverFlow !"<<endl;
	 exit(0);
	}
   p=&(L.elem[i-1]);
   e=*p;
   q=L.elem+L.length-1;
   for (++p;p<=q;++p)
      *(p-1)=*p;
   --L.length;
   cout<<"Success to Delete Sq_list !"<<endl;
}//end of ListDelete_Sq() function

void main()                                             //main() function
{
   SqList L;
   int e;
   int i,j;
   //L.elem=array;
   //L.length=LIST_INIT_LENGTH;
   cout<<"ListDelete_Sq.cpp"<<endl<<"================="<<endl<<endl;
   
   InitList_Sq(L);
   cout<<"Please input the Length of Demo SqList L: <eg. 5> ";
   cin>>L.length;
   cout<<"Please input the data of Demo SqList L: <eg. {34,54,30,2,40,...}> "<<endl;
   for(j=0;j<L.length;j++)
     cin>>L.elem[j];
	 
   cout<<endl;
   cout<<"Success to create a SqList:"<<endl;
   cout<<"Please input the NO.i element of Sq_List to delete:  <eg. 3> ";
   cin>>i;
   ListDelete_Sq(L,i,e);
   cout<<"The SqList After Delete is:  ";
   for(j=0;j<L.length;j++)
      cout<<L.elem[j]<<"  ";
   cout<<endl<<"...OK...!"<<endl;
   getch();
}//end of main() function