6 5 鏈式表操作集

2021-10-09 09:58:41 字數 2563 閱讀 7678

本題要求實現鏈式表的操作集。

position find

( list l, elementtype x )

;list insert

( list l, elementtype x, position p )

;list delete

( list l, position p )

;

其中list結構定義如下:

typedef

struct lnode *ptrtolnode;

struct lnode

;typedef ptrtolnode position;

typedef ptrtolnode list;

各個操作函式的定義為:

position find( list l, elementtype x ):返回線性表中首次出現x的位置。若找不到則返回error;

list insert( list l, elementtype x, position p ):將x插入在位置p指向的結點之前,返回鍊錶的表頭。如果引數p指向非法位置,則列印「wrong position for insertion」,返回error;

list delete( list l, position p ):將位置p的元素刪除並返回鍊錶的表頭。若引數p指向非法位置,則列印「wrong position for deletion」並返回error。

#include

#include

#define error null

typedef

int elementtype;

typedef

struct lnode *ptrtolnode;

struct lnode

;typedef ptrtolnode position;

typedef ptrtolnode list;

position find

( list l, elementtype x )

;list insert

( list l, elementtype x, position p )

;list delete

( list l, position p )

;int

main()

scanf

("%d"

,&n)

;while

( n--)}

l =insert

(l, x,

null);

if( l==error )

printf

("wrong answer\n");

else

printf

("%d is inserted as the last element.\n"

, x)

; p =

(position)

malloc

(sizeof

(struct lnode));

tmp =

insert

(l, x, p);if

( tmp!=error )

printf

("wrong answer\n");

tmp =

delete

(l, p);if

( tmp!=error )

printf

("wrong answer\n");

for( p=l; p; p = p->next )

printf

("%d "

, p->data)

;return0;

}/* 你的**將被嵌在這裡 */

position newnode

(elementtype x)

;position find

(list l, elementtype x)

return error;

}list insert

(list l, elementtype x, position p)

else

} pnew->next = p;

ptemp->next = pnew;}}

else

//l==null && p==null的情況

l = pnew;

return l;

}list delete

(list l, position p)

position ptemp = l;

if(p == l)

else

} ptemp->next = p->next;

}free

(p);

return l;

}position newnode

(elementtype x)

}

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