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在以下两个程序的基础上,写一个函数del,用来删除动态链表中

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在以下两个程序的基础上,写一个函数del,用来删除动态链表中指定的结点。<br /> ①&nbsp;<br /> <pre class="prettyprint lang-html"># include &lt;stdio.h&gt;&nbsp; # include &lt;stdlib.h&gt;&nbsp; # define LEN sizeof(struct Student)&nbsp; struct Student&nbsp; {long num; float score; struct Student*next; };&nbsp; int n; //n为全局变量,本文件模块中各函数均可使用它 struct Student *creat(void) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//定义函数。此函数返回一个指向链表头的指针 {struct Student*head; struct Student*p1,*p2; n=0;&nbsp; p1=p2=(struct Student*)malloc(LEN); //开辟一个新单元 scanf("%ld,%f”,&amp;p1-&gt;num,&amp;p1-&gt;score); //输入第1个学生的学号和成绩 head=NULL; while(p1-&gt;num!=0)&nbsp; {n=n+1; if(n==1)head=p1; else p2-&gt;next=p1; p2=p1; P1=(struct Student*)maloc(LEN); //开辟动态存储区,把起始地址赋给p1&nbsp; scanf("%ld,%f”,&amp;p1-&gt;num,&amp;p1-&gt;score); //输入其他学生的学号和成绩 }&nbsp; p2-&gt;next=NULL; return(head); }&nbsp;</pre> 可以写一个main 函数,调用这个creat函数:<br /> <pre class="prettyprint lang-html">int main() (struct Student *pt; pt=creat(); //函数返回链表第一个结点的地址 printf(“\nnum:%ld\nscore:%5.1f\n",pt-&gt;num,pt-&gt;score); &nbsp; //输出第1个结点的成员值 return 0; };&nbsp;</pre> ②&nbsp;<br /> <pre class="prettyprint lang-html"># include &lt;stdio.h&gt;&nbsp; # include &lt;stdlib.h&gt;&nbsp; # define LEN sizeof(struct Student)&nbsp; struct Student &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //声明结构体类型struct Student&nbsp; {long num; float score; struct Student * next; };&nbsp; int n; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //全局变量n&nbsp; void print(struct Student* head) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //定义print函数 {struct Student*p; //在函数中定义struct Student类型的变量p&nbsp; printf("\nNow,These%d records are:\n",n); p=head; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//使p指向第1个结点 if(head!=NULL) &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ∥若不是空表 do&nbsp; {printf("%ld%5.1f\n",p-&gt;num,p-&gt;score); //输出一个结点中的学号与成绩 p=p-&gt;next; //p指向下一个结点 }while(p!=NULL); //当p不是“空地址”&nbsp; }&nbsp;</pre> <div> <br /> </div> <stdio.h><stdlib.h><stdio.h><stdlib.h></stdlib.h></stdio.h></stdlib.h></stdio.h>
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#include<stdio.h>

struct student

{1ong num;

float score;

struct student *next;

};

int n;


struct student *del(struct student *head,1ong num)

{struct student *p1,*p2;

if(head==NULL)                       //是空表

{printf("\nlist null!\n");

return(head);

}

p1=head;                //使p1指向一个节点

while(num!=p1->num&&p1->next!=NULL)                //p1指向的不是所要找的结点且后面还有结点*/

{p2=p1;p1=p1->next;}                             //p1后移一个结点

if(num==p1->mum)                             //找到了

if(p1==head)head=p1->next;              //若pl指向的是首结点,把第二个结点地址赋予head*/

else p2->next=p1->next;        //否则将下一结点地址赋给前一结点地址

printf("delete:%1d\n",num);

n=n-1;

}

else printf(%1dnot been found!\n",num);              //找不到该结点

return(head);

}


发表于 2018-03-25 10:35:30 回复(0)