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楼主 |
发表于 2013-5-5 07:22:46
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#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
#define LEN sizeof(struct student) // student结构的大小
struct student *creat(); //创建链表
struct student *del( struct student *head, int num); //del函数用于删除结点, *head即链表
//的头指针, num是要删除的结点num。
void print(struct student *head); //打印链表
struct student
{
int num;
float score;
struct student *next;
};
int n; //全局变量,用来记录存放了多少数据。
void main()
{
struct student *stu, *p;
int n;
stu = creat();
p = stu;
print( p );
printf("Please enter the num to delete: ");
scanf("%d", &n);
print( del(p, n) );
printf("\n\n");
system("pause");
}
struct student *creat()
{
struct student *head;
struct student *p1, *p2;
p1 = p2 = (struct student *)malloc(LEN); // LEN是student结构的大小
printf("Please enter the num :");
scanf("%d", &p1->num);
printf("Please enter the score :");
scanf("%f", &p1->score);
head = NULL;
n = 0;
while( p1->num )
{
n++;
if( 1 == n )
{
head = p1;
}
else
{
p2->next = p1;
}
p2 = p1;
p1 = (struct student *)malloc(LEN);
printf("\nPlease enter the num :");
scanf("%d", &p1->num);
printf("Please enter the score :");
scanf("%f", &p1->score);
}
p2->next = NULL;
return head;
}
void print(struct student *head)
{
struct student *p;
printf("\nThere are %d records!\n\n", n);
p = head;
if( head )
{
do
{
printf("学号为 %d 的成绩是: %f\n", p->num, p->score);
p = p->next;
}while( p );
}
}
struct student *del( struct student *head, int num)
{
struct student *p1, *p2;
if( NULL == head )
{
printf("\nThis list is null!\n");
goto end;
}
p1 = head;
while( p1->num != num && p1->next != NULL)
{
p2 = p1;
p1 = p1->next;
}
if( num == p1->num )
{
if( p1 == head )
{
head = p1->next;
}
else
{
p2->next = p1->next;
}
printf("Delete No: %d succeed!\n", num);
n = n-1;
}
else
{
printf("%d not been found!\n", num);
}
end:
return head;
} |
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