UC知道C语言基本问题
来源：百度知道 编辑：UC知道 时间：2024/06/03 15:18:43
以-1作为结束标志，编写一个创建链表的函数。请看下面问题
#include<stdio.h>
#include<stdlib.h>
struct student
{
int num;
float score;
char a;
char b;
struct student *link;
};
struct student *creat()
{
struct student *head,*p,*q;
int number;
head=0;
printf("%d",sizeof(struct student));
scanf("%d",&number);
while(number!=-1)
{
q=(struct student *)malloc(sizeof(struct student));
q->num=number;
scanf("%f",&q->score);
if(head==0)
head =q;
else
p->link=q;
p=q;//这里可以不可以改成head=q?
scanf("%d",&number);
}
if(head!=0)
p->link=0;
return(head);
}
#include<stdio.h>
#include<stdlib.h>
struct student
{
int num;
float score;
char a;
char b;
struct student *link;
};
struct student *creat()
{
struct student *head,*p,*q;
int number;
head=0;
printf("%d",sizeof(struct student));
scanf("%d",&number);
while(number!=-1)
{
q=(struct student *)malloc(sizeof(struct student));
q->num=number;
scanf("%f",&q->score);
if(head==0)
head =q;
else
p->link=q;
p=q;//这里可以不可以改成head=q?
scanf("%d",&number);
}
if(head!=0)
p->link=0;
return(head);
}
head是指针，不能和0比，也不能用0赋值；
而且那个地方也不能改为：head=q;
你的程序有点错，我改了一下(应该注意缩进)：
#include<stdio.h>
#include<stdlib.h>
struct student
{
int num;
float score;
char a;
char b;
struct student *link;
};
struct student *creat()
{
struct student *head,*p,*q;
int number;
head=NULL;
printf("%d",sizeof(struct student));
scanf("%d",&number);
while(number!=-1)
{
q=(struct student *)malloc(sizeof(struct student));
q->num=number;
scanf("%f",&(*q).score);
if(head==0)
head =q;
else
p->link=q;
p=q;//这里不可以改成head=q
scanf("%d",&number);
}
if(head!=0)
p->link=0;
return(head);
}
不能
head 是链表头指针,如果再指向q.几次循