#include<stdio.h>
#include<string.h>
typedef struct student
{
        char name[10];
        int num;
        float score;
        struct student *next;
}student;
void namesearch(student *h,char n[])
{
        student *p;
        ;
        for(p=h;p!=NULL;p=p->next)
        {
                if(0==strcmp(p->name,n))
                        
                break;

        }
        if(p=NULL)
                printf("该同学不存在！");
        else
        {
                printf("%s\t%d\t%f\n",p->name,p->num,p->score);
        }
}

int main()
{
        student *h,s1={"wang",001,98},s2={"li",002,99},s3={"xu",003,78};
        h=&s1;
        s1.next=&s2;
        s2.next=&s3;
        s3.next=NULL;
        namesearch(h,"li");
        
}

怎么p-name是一个错误的指针

if(p=NULL)改为if(p==NULL)

#include<stdio.h>
#include<string.h>
typedef struct student
{
    char name[10];
    int num;
    float score;
    struct student *next;
} student;
void namesearch(student *h,char n[])
{
    student *p;
    for(p=h; p!=NULL; p=p->next)
    {
        if(0==strcmp(p->name,n))

            break;
    }
    if(p==NULL)//原程序缺少一等号，相当于把NULL赋值给p，故无法正常输出
        printf("该同学不存在！");
    else
    {
        printf("%s\t%d\t%f\n",p->name,p->num,p->score);
    }
}

int main()
{
    student *h,s1= {"wang",001,98},s2= {"li",002,99},s3= {"xu",003,78};
    h=&s1;
    s1.next=&s2;
    s2.next=&s3;
    s3.next=NULL;
    namesearch(h,"li");
return 0;
}

这个指针没有问题！

if(p=NULL)这个判断问题吧，p->name可以用，你的编译器报错了？

只需要改下p==NULL