#include<stdio.h>
#include<string.h>
#define maxsize 100
struct student{
	int num;
	char name[20];
	char sex[20];
	int age;
	int math,chin,eng;
	int average;
};

int count = 0;
void average(struct student students[])
{
	int i;
	for (i = 0; i < count; i++)
	{
		students[i].average = (students[i].eng + students[i].math + students[i].chin) / 3;

	}



}
void new_students(struct student students[])
{
	int i, n;
	if (count == maxsize){
		printf("the number isfull");
		return;
	}
	printf("the number is n");
	scanf("%d", &n);
	for (i = 0; i < n; i++){
		printf("the student's num");
		scanf("%d", &students[i].num);
		printf("the student's name");
		scanf("%s",&students[i].name);
		printf("the student's math");
		scanf("%d", &students[i].math);
		printf("the student's chin");
		scanf("%d", &students[i].chin);
		printf("the student's eng");
		scanf("%d", &students[i].eng);
		printf("the student's age");
		scanf("%d", &students[i].age);
		printf("the student's sex");
		scanf("%s", &students[i].sex);
		
		count++;
	}
	average(students);
}
void out_input(struct student students[])
{
	int i;
	if (count == 0){
		printf("count of students is 0");
		return;
	}
	
	printf("num\t name\t math\t chin\t eng\t average\t age\t sex\t\n");
	for (i = 0; i < count; i++){
		printf("num:%d  ", students[i].num);
		printf("name:%s ", students[i].name);
		printf("math:%d ", students[i].math);
		printf("chin:%d ", students[i].chin);
		printf("eng:%d ", students[i].eng);
		printf("average:%d ", students[i].average);
		printf("age:%d ", students[i].age);
		printf("sex:%s ", students[i].sex);
		printf("\n");




	}
	getchar();
	
}


void sort(struct student s[])
{
	struct student temp;
	int i,  j;
	for (i = 0; i < count; i++)
	{
		for (j = 0; j < i - j - 1; j++)
		if (s[j].average>s[j + 1].average){
			temp = s[j];
			s[j] = s[j + 1];
			s[j + 1] = temp;

		}
	}

}
void modify(struct student *p)
{
	int num, score=1, i;
	printf("input the new student");
	scanf("%d", &num);
	for (i = 0; i < count; i++, p++)
	{
		if (p->num = num)
		{
			printf("请输入你的id\n");
			scanf("%d", &p->num);
			printf("请输入你的名字\n");
			scanf("%s", p->name);
			printf("请输入你的数学\n");
			scanf("%d",&p->math);
			printf("请输入你的中文\n");
			scanf("%d", &p->chin);
			printf("请输入你的英文\n");
			scanf("%d", &p->eng);
			printf("请输入你的性别\n");
			scanf("%s", p->sex);
			
		}
		else
			score++;
	}
	average(p);
	if (score > count)
	{
		printf("查无此人 请重新输入");
	}
	
}
void save(struct student students[])
{
	FILE *pFile = fopen("StudnetMessageSystem.txt", "w+");
	for (int i = 0; i < count; i++)
	{
		fprintf(pFile, "名字%s\t学号%d\t性别%s\t数学%d\t中文%d\t英文%d\t年龄%d\t平均成绩%d\t   \n", students[i].name,students[i].num,students[i].sex,students[i].math,students[i].chin,students[i].eng,students[i].age,students[i].average);
	}
	fclose(pFile);
	printf("保存成功");
}
void search_student(struct student students[])
{
	int i, flag = 0, a;
	int num,age;
	char name[20];
	char sex[20];
	printf("输入你的查询方式1.学号2.名字3.性别4.年龄");
	scanf("%d", &a);
	switch (a)
	{
	case 1:printf("请输入学号");
		scanf("%d", &num);
		for (i = 0; i < count; i++)
	{
			   if (students[i].num == num)
			   {
				   flag = 1;
				   
			   }
			   if (flag)
			   {
				   printf("num:%d", students[i].num);
				   printf("name:%s", students[i].name);
				   printf("math:%d", students[i].math);
				   printf("chin:%d", students[i].chin);
				   printf("eng:%d", students[i].eng);
				   printf("average:%d", students[i].average);
				   printf("age:%d", students[i].age);
				   printf("sex:%s", students[i].sex);
				   printf("\n");

			   }
			   else
				   printf("no found");
	
	}
		break;
	case 2:printf("请输入名字");
		scanf("%s", &name);
		for (i = 0; i < count; i++)
	{
			   if (!strcmp(students[i].name, name))
			   {
				   flag = 1;
				   
			   }
			   if (flag)
			   {
				   printf("num:%d", students[i].num);
				   printf("name:%s", students[i].name);
				   printf("math:%d", students[i].math);
				   printf("chin:%d", students[i].chin);
				   printf("eng:%d", students[i].eng);
				   printf("average:%d", students[i].average);
				   printf("age:%d", students[i].age);
				   printf("sex:%s", students[i].sex);
				   printf("\n");

			   }
			   else
				   printf("no found");

	}
		break;
	case 3:printf("请输入性别");
		scanf("%s", &sex);
		for (i = 0; i < count; i++)
		{
			if (!strcmp(students[i].name, name))
			{
				flag = 1;
				
			}
			if (flag)
			{
				printf("num:%d", students[i].num);
				printf("name:%s", students[i].name);
				printf("math:%d", students[i].math);
				printf("chin:%d", students[i].chin);
				printf("eng:%d", students[i].eng);
				printf("average:%d", students[i].average);
				printf("age:%d", students[i].age);
				printf("sex:%s", students[i].sex);
				printf("\n");

			}
			else
				printf("no found");

		}
		break;
	case 4:printf("请输入年龄");
		   scanf("%d", &age);
		for (i = 0; i < count; i++)
		{
			if (students[i].age == age)
			{
				flag = 1;
				
			}
			if (flag)
			{
				printf("num:%d", students[i].num);
				printf("name:%s", students[i].name);
				printf("math:%d", students[i].math);
				printf("chin:%d", students[i].chin);
				printf("eng:%d", students[i].eng);
				printf("average:%d", students[i].average);
				printf("age:%d", students[i].age);
				printf("sex:%s", students[i].sex);
				printf("\n");
			}
			else
				printf("no found");

		}
		break;
	default:
		break;
	}
	if (count == 0){
		printf("学生数目为零");
		return;
	}

	
}
void delet(struct student students[])
{
	int num;
	printf("输入你想删除学生的学号");
	scanf("%d", &num);
	for (int i = 0; i < count; i++)
	{
		if (students[i].num == num)
		{
			students[i].num = students[i + 1].num;
			strcpy(students[i].name, students[i + 1].name);
			students[i].age = students[i + 1].age;
			strcpy(students[i].sex, students[i + 1].sex);
			students[i].math = students[i + 1].math;
			students[i].chin = students[i + 1].chin;
			students[i].eng = students[i + 1].eng;

		}
	}
	if (count == 1)
		count = 0;
}

void delet(struct student students[]);
void save(struct student students[]);
void new_students(struct student students[]);
void out_input(struct student students[]);
void search_student(struct student students[]);
void modify(struct student *p);
void average(struct student students[]);
void sort(struct student s[]);
int main()
{
	struct student students[maxsize];
	
	while (1)
	{
		int a;
		printf("输入1：输入学生2：修改信息；3：查询信息；4：显示基本信息5:保存信息6:删除学生信息0:关闭\n");
		printf("请输入指令");
		scanf("%d", &a);
		switch (a)
		{
		case 1:new_students(students);
			   average(students);
			break;
		case 2:modify(students);
			break;
		case 3:search_student(students);
			break;
		case 4:out_input(students);
			break;
		case 5:save(students);
			break;
		case 6:delet(students);
			break;
		case 0:
			return 0;
			break;
		default:
			printf("输出错误指令");
			break;
		}
	}
	
	
	



	return 0;
}