这段代码为什么执行到最后不输出,就退出了?

Be_envious

#include<stdio.h>
#include<malloc.h>
#define NULL ((void *)0)
#define LEN sizeof(struct student)
struct student
{
long num;
float score;
struct student *next;
};
int n;
struct student *creat(void)
{
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;
p1=p2;
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("\nNow,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);
}
main()
{
creat();
void print(struct student *head);
system("pause");

}

是主函数调用的问题吗?

zfzhuman123

第三行#define NULL ??????
NULL可以定义吗

Be_envious

zfzhuman123 发表于 2011-8-10 19:21

                               
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第三行#define NULL ??????
NULL可以定义吗

可以  和头文件里的一样  就不会提示

响当当

#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>

//#define NULL ((void *)0)

#define LEN sizeof(struct student)

struct student

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

int n;

struct student *creat(void)
{

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++的效率会高一点儿吧if(n==1)

head=p1;

else

p2->next=p1;

p1=p2;

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("\nNow,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);

}
}

main()

{
        struct student *head;
        void print(struct student *head);//这里是函数声明不是调用        head=creat();

        print(head);
        system("pause");


}

响当当

不好意思，那个代码错乱了，但是我是想说明问题的所以特地用了红颜色的，你把那个head=creat()自己移下来吧，好看点儿！

Be_envious

响当当 发表于 2011-8-20 20:15

                               
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#include
#include
#include

灰常感谢,这个问题已经解决了
你指出的问题
我已经改正了
尽管这样
还是很
感谢