C语言版学生管理系统，作者：没牙的狼

原帖及讨论：http://bbs.bc-cn.net/dispbbs.asp?BoardID=5&ID=120391

自己写的小东西,虽然网上有很多了,只为练练手,我有很多不足,希望大家多多指点,赐教.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
/********定义学生结构体********/
typedef struct Link
{
    int number;
    char name[10];
    char sex[4];
    int  Chinese;
    int  English;
    int  Match;
    float  average;
    struct Link *next;
}Student;
int amount=0;;//记录学生个数
/*****************************/
/***********初始化学生表*************/
Student *InitStudent()
{
    Student *Q;
    Q=(Student*)malloc(sizeof(Student));
    if(Q!=NULL)
    {
        Q->next=NULL;
        return Q;
    }
    else
        return NULL;
}
/***********************************/
/**************创建学生数据表*********************/
int CreatStudent(Student *Q)
{
    int flag,n;
    Student *s;
    n=0;
    while(flag)
    {
        s=(Student*)malloc(sizeof(Student));
        if(s==NULL)
        {
            printf("创建失败！");
            return 0;
        }
        printf("请输入学号(输入0退回上一步):");
        scanf("%d",&s->number);
        if(s->number==0)
            goto endp;
        if(n==s->number)
        {
            printf("输入学号已存在!\n");
            goto end;
        }
        while(s->number<0)
        {
            getchar();
            printf("\n学号不能为小于零!");
            printf("\n请输入学号,输入0退回上一步:");
            scanf("%d",&s->number);
        }
        printf("请输入姓名:");
        scanf("%s",s->name);
        printf("请输入性别m/w:");
        scanf("%s",s->sex);
        printf("请输入语文成绩:");
        scanf("%d",&s->Chinese);
        while(s->Chinese>100||s->Chinese<0)
        {
            getchar();
            printf("请输入语文成绩:");
            scanf("%d",&s->Chinese);
        }
        printf("请输入数学成绩:");
        scanf("%d",&s->Match);
        while(s->Match>100||s->Match<0)
        {
            getchar();
            printf("请输入数学成绩:");

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