/*成绩打印*/
void PrintScore(Lnode *h)
{
 
	Lnode *p = h->next;
	printf("%-14s%-8s%-8s%-8s%-8s%-8s\n","排名", "学号", "姓名", "数学", "英语", "数据结构", "平均绩点");
	while (p != NULL)
	{
		printf("%-14s%-8s%-8d%-8d%-8d%.2f\n", p->ID, p->Name, p->Score[0], p->Score[1], p->Score[2], p->Ave_Sco);
		p = p->next;
	}
}
 
/*成绩修改*/
void ModifyScore(Lnode *h)
{
	Lnode *p = h->next;
	char name[10], id[15];
	int Math, English, Datastruct;
	printf("请输入学生姓名：");
	scanf("%s", name);
	printf("请输入学生学号：");
	scanf("%s", id);
 
	while (p)
	{
		if (strcmp(p->Name, name)==0 && strcmp(p->ID, id)==0)
		{
			printf("当前学生信息:\n");
			printf("%-14s%-8s%-8s%-8s%-8s\n", "学号", "姓名", "数学", "英语", "数据结构");
			printf("%-14s%-8s%-8d%-8d%-8d\n", p->ID, p->Name, p->Score[0], p->Score[1], p->Score[2]);
			printf("请输入更正后的数学成绩：");
			scanf("%d", &Math);
			printf("请输入更正后的英语成绩：");
			scanf("%d", &English);
			printf("请输入更正后的数据结构成绩：");
			scanf("%d", &Datastruct);
			p->Score[0] = Math;
			p->Score[1] = English;
			p->Score[2] = Datastruct;
			break;
		}
		else
		{
			p = p->next;
		}
	}//while循环结束
}
 
/*信息查找*/
void FindInf(Lnode *h)
{
	Lnode *p = h->next;
	char name[10], id[15];
	printf("请输入学生姓名：");
	scanf("%s", name);
	printf("请输入学生学号：");
	scanf("%s", id);
 
	while (p)
	{
		if (strcmp(p->Name, name) == 0 && strcmp(p->ID, id) == 0)
		{
			printf("当前学生信息:\n");
			printf("%-14s%-8s%-8s%-8s%-8s\n", "学号", "姓名", "数学", "英语", "数据结构");
			printf("%-14s%-8s%-8d%-8d%-8d\n", p->ID, p->Name, p->Score[0], p->Score[1], p->Score[2]);
			break;
		}
		else
		{
			p = p->next;
		}
	}//while循环结束
}
 
/*删除*/
void Delete(Lnode *h)
{
	Lnode *p = h, *q;
	q = p->next;
	char name[10], id[15];
	printf("请输入学生姓名：");
	scanf("%s", name);
	printf("请输入学生学号：");
	scanf("%s", id);
 
	while (q)
	{
		if (strcmp(q->Name, name) == 0 && strcmp(q->ID, id) == 0)
		{
			p->next = q->next;
			free(q);    //删除p节点		
			printf("删除成功\n");
			break;
		}
		else
		{
			p = p->next;
			q = q->next;
		}
	}//while循环结束
}
 
/*退出系统*/
void Quit(Lnode *h)
{
	SaveInf(h);    //退出时保存信息
	exit(0);
}
 
/*打开文件*/
void LoadInf(Lnode *h)
{
	Lnode *p = h;
	Lnode *q;   //临时变量 用于保存从文件中读取的信息
	FILE* file = fopen("./Information.dat", "rb");
	if (!file)
	{
		printf("文件打开失败！");
		return ;
	}
 
	/*
		使用feof判断文件是否为结束要注意的问题：
			当读取文件结束时，feof函数不会立即设置标志符为-1，而是
			需要再读取一次后，才会设置。所以要先读一次。
	*/
	q = (Lnode *)malloc(sizeof(Lnode));
	fread(q, sizeof(Lnode), 1, file);
	while (!feof(file))    //一直读到文件末尾
	{
		p->next = q;
		p = q;
		q = (Lnode *)malloc(sizeof(Lnode));
		fread(q, sizeof(Lnode), 1, file);
	} //while循环结束
 
	p->next = NULL;
	fclose(file);
}
 
/*保存信息到文件中*/
void SaveInf(Lnode *h)
{
	Lnode *p = h->next;
	int flag;
	FILE* file = fopen("./Information.dat", "wb");
	if (!file)
	{
		printf("文件打开失败！");
		return;
	}
	while (p != NULL)
	{
		flag = fwrite(p, sizeof(Lnode), 1, file);   //将p的内容写到文件中
		if (flag != 1)
		{
			break;
		}
		p = p->next;
	}
	fclose(file);
}