void insert_func(void) //一插入就比较字符串（2 2想比较很简单） 不是等到全部插完了才比较
{
char s_temp[4];
ptr=(struct student *) malloc(sizeof(struct student));
printf(" Student name : ");
gets(ptr->name);
printf(" Student score: ");
gets(s_temp);
ptr->score = atoi(s_temp);//把字符串转化为 整数  为什么不直接把成绩存在ptr->score ？？？

sort_func();
}

/*以分数高低由大到小排列*/
void sort_func(void)
{
//插入数据
prev = head;
current = head->next;
while ((current != NULL) && (current->score > ptr->score))
{
prev = current;
current = current->next;
}
ptr->next = current;
prev->next = ptr;
}

void delete_func(void)
{
char del_name[20];
printf(" Delete student name: ");
gets(del_name);

prev = head;
current = head->next;
while ((current != NULL) && (strcmp(current->name , del_name)!=0))//用到了strcmp 比较字符串
{
prev = current;
current = current->next;
}
if (current != NULL)
{
prev->next = current->next;
free(current);
printf(" %s student record deleted\n",del_name);
}
else
printf(" Student %s not found\n",del_name);

anykey_func();
}

void modify_func(void)
{
char n_temp[20],s_temp[4];
printf(" Modify student name: ");
gets(n_temp);//这样输入姓名
current=head->next;

while ((current != NULL) && (strcmp(current->name , n_temp)!=0))
{
prev = current;
current = current->next;
}
if (current != NULL)
{
printf(" **************************\n");
printf("  Student name : %s\n",current->name);
printf("  Student score: %d\n",current->score);
printf(" **************************\n");
printf(" Please enter new score: ");
gets(s_temp);
current->score = atoi(s_temp);
printf(" %s student record modified\n",n_temp);
}
else
printf(" Student %s not found\n",n_temp);

anykey_func();
}

void display_func(void)
{
int count=0;
system("cls");
if(head->next == NULL)
{
printf(" No student record\n");
}
else
{
printf("  NAME                SCORE\n");
printf(" ---------------------------\n");
current=head->next;
while(current != NULL)
{
printf("  %-20s %3d\n", current->name, current->score);
count++;
current=current->next;
if(count % 20 == 0) getch();
}
printf(" ---------------------------\n");
printf(" Total %d record(s) found\n", count);
}
anykey_func();
}

void anykey_func(void)//任何键继续
{
printf(" Press any key to continue...");
getch();
printf("\n");
}

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