运行的问题
程序如下#include<stdio.h>
#define NULL 0
#define LEN sizeof(struct student)
struct student
{
long num;
float pay;
struct student *next;
};
int n;
struct student *creat()
{
struct student *head;
struct student *p1,*p2;
n=0;
p1=p2=(struct student *)malloc(LEN);
scanf("%ld,%f",&p1->num,&p1->pay);
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->pay);
}
p2->next=NULL;
return(head);
}
void list(struct student *head)
{
struct student *p;
printf("\n now .the %d records are:\n",n);
p=head;
if(head!=NULL)
do{
printf("%ld %f\n",p->num,p->pay);
p=p->next;
}while(p!=NULL);
}
main()
{
struct student *head;
printf("input records:\n");
head=creat();
list(head);
}
为什么这程序在C++里可运行,但在C里不能呢?在C里只能执行一次,然后就提示错为
“scanf:floating pointformats not linked Abnormalprogram termination”
怎么会这样呢?
还有就是开始的那几句
p1=p2=(struct student *)malloc(LEN);
scanf("%ld,%f",&p1->num,&p1->pay);
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->pay);
}
p2->next=NULL;
return(head);
应该如何理解呢? 第一个问题尚未测试估计是由于你在while中时由于重复分配内存的原因.....
第二个问题该函数实现了链表结构....head代表链表的头....
while循环的工作是添加链表数据....p2最后的指向表示了链表结尾.....
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