关于数据结构的创建列表,输出列表,插入列表,和撤除列表。我的编译通过了,但是有一个警告。而且得不到结果,估计是创建列表有问题。但
程序内容如下:#define NULL 0
#define LEN sizeof(struct student)
struct student
{long num;
float score;
struct student *next;
};
int n;
struct student *creat(void)
{struct student *head,*p1,*p2;
n=0;
head=NULL;
p1=(struct student *)malloc(LEN);
p2=p1;
scanf("%ld,%f",&p1->num,&p1->score);
while(p1->num!=0)
{n=n+1;
if(n==1)
head=p1;
else
p2->next=p1;
p2=p1;
p1=(struct student *)malloc(LEN);
scanf("%ld,%f",&p1->num,&p1->score);
}
p2->next=NULL;
return(head);
}
void print (struct student *head)
{struct student *p;
printf("\n now ,these %d records are :\n",n);
p=head;
if(head!=NULL)
do
{printf("%ld,%5.1f\n",p->num,p->score);
p=p->next;
}
while(p!=NULL);
}
struct student *del(struct student *head,long num)
{struct student *p1,*p2;
p1=head;
while(p1->num!=num&&p1->next!=NULL)
{
p2=p1;
p1=p1->next;
}
if(p1->num==num)
{if(p1==head)
head=p1->next;
else
p2->next=p1->next;
printf("delete :%ld\n",num);
n=n-1;
}
else
printf("%ld not been found!\n",num);
return(head);
}
struct student *insert(struct student *head,struct student *stu)
{struct student *p0,*p1,*p2;
p1=head;
p0=stu;
if(head==NULL)
{
head=p0;
p0->next=NULL;
}
else
{while((p0->num>p1->num)&&(p1->next!=NULL))
{p2=p1;p1=p1->next;}
if(p0->num<p1->num)
{if(p1==head)
{head=p0;p0->next=p1;}
else
{p2=p0;p0->next=p1;}
}
else
{p1->next=p0;p0->next=NULL;}
}
n=n+1;
return(head);
}
main()
{struct student *head,*stu;
long del_num;
printf("input records:\n");
head=creat();
print(head);
printf("\ninput the deleted number:");
scanf("%ld",&del_num);
while(del_num!=0)
{head=del(head,del_num);
print(head);
printf("input the deleted number:");
scanf("%ld",&del_num);
}
printf("\ninput the inserted record:");
stu=(struct student *)malloc(LEN);
scanf("%ld,%f",&stu->num,&stu->score);
while(stu->num!=0)
{head=insert(head,stu);
print(head);
printf("input the inserted record:");
stu=(struct student *)malloc(LEN);
scanf("%ld,%f",&stu->num,&stu->score);
}
}