例9.7&例9.9 实现创建单项动态链表并输出各结点数据

#include
#include

#define LEN sizeof(struct Student)

struct Student
{
	long num;
	float score;
	struct Student *next;
};

int n;

struct Student *creat()		//建立链表的函数
{
	struct Student *head;
	struct Student *p1, *p2;
	n = 0;
	p1 = p2 = (struct Student *)malloc(LEN);
	scanf("%ld,%f", &p1->num, &p1->score);
	head = NULL;
	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)
{
	printf("\nNow, These %d records are:\n",n);
	if(head != NULL)
	{
		do{
			printf("%ld    %5.1f\n",head->num,head->score);
			head = head->next;
		}while(head != NULL);
	}
 } 

//void print(struct Student *head)	//输出链表的函数
//{
//	struct Student *p;
//	printf("\nNow,These %d records are:\n",n);	//records记录
//	p = head;	//p指向第1个结点
//	if (head != NULL)	//若不是空表
//	{
//		do
//		{
//			printf("%ld   %5.1f\n", p->num, p->score);
//			p = p->next;
//		}while (p != NULL);
//	}
//}



int main()
{
	struct Student *head; 
	head= creat();	//调用函数返回链表第1个结点的地址
	print(head);
}