代码如下：
#include <stdio.h>
#include <malloc.h>
struct student
{
    char num[13];char name[10];char sex[10];
    struct student *next;
};
struct student *Input(int n)
{
    int i;
    struct student *r,*s,*head;
    r=s=(struct student*)malloc(sizeof(struct student));
    for(i=0;i<n;i++)
    {
        printf("请输入第%d个学生的学号:",i+1);
        scanf("%s",&s->num);
        printf("请输入第%d个学生的姓名:",i+1);
        scanf("%s",&s->name);
        printf("请输入第%d个学生的性别:",i+1);
        scanf("%s",&s->sex);
        if(n==0)
            head=r;
        if(n>0)
        {
            r->next=s;
        }
        r=s;
        s=(struct student*)malloc(sizeof(struct student));
    }
    r->next=NULL;
    return head;
}

void Output(struct student *x,int n)
{
    int count=1;
    printf("请输入要调出信息的学生序号:");
    scanf("%d",&n);
    while(count<n)
    {
        x=x->next;
        count++;
    }
    if(count==n)
    {
        printf("信息如下:\n");
        printf("学号为:%s\n",x->num);
        printf("姓名为:%s\n",x->name);
        printf("性别为:%s\n",x->sex);
    }
}

int main()
{
    struct student *head;int n,m;
    printf("请输入学生个数:");
    scanf("%d",&n);
    head=Input(n);
    Output(head,m);
    return 0;
}
输入了要输出的序号之后就崩溃了。。。

Output(head,m); 这时的m是什么