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楼主 |
发表于 2002-11-2 16:08:13
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it's complied in Mandrake linux,gcc 3.2
i alaways in the Mandrake .
代码 for now,i correct in my opinion and some of you advise,:
#include <stdio.h>
/*#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;
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)
{struct student *p;
printf("\nNow,These %d records are:\n",n);
p=head;
if(head != NULL)
do
{printf("%ld,%f\n",p->num,p->score);
p=p->next;
}while(p != NULL);
}
struct student * del(struct student *head,long num)
{ struct student *p1,*p2;
if(head == NULL){printf("\nlist null!\n");return(head);}
p1=head;
while(num !=p1->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:%ld\n",num);
n=n-1;
}
else printf("%ld not been found! \n",num);
return(head);
}
struct student * insert(struct student *head,struct student *stud)
{ struct student *p0,*p1,*p2;
p1=head;
p0=stud;
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(head == p1)head=p0;
else p2->next=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);
}
}
AND WHEN I "gcc -o lianbiao lianbiao.c"
IT'S ALL RIGHT!
but WHEN
[smallmantou@Smallmantou linuxC]$ ./lianbiao
input records:
99101,99
99103,87
99105,77
0
Now,These 3 records are:
99101,99.000000
99103,87.000000
99105,77.000000
input the deleted number:99103
delete:99103
Now,These 2 records are:
99101,99.000000
99105,77.000000
input the deleted number:0
input the inserted record:99111,66
Now,These 3 records are:
input the inserted record:99112,12
Segmentation fault
WHY??
Segmentation fault ,WHY ,THERE IS IT?
i have check for long time,help me correct it! |
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IP卡
狗仔卡
发表于 2002-11-2 14:33:18
显身卡