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带文件保存的简单学生信息管理系统

  1.   信息输入    
  2.   总分            
  3.  平均分     
  4.  最高成绩
  5.  最低成绩
  6.  成绩排序
  7.  删除信息
  8. 查找信息
  9. 按学号姓名修改成绩
  10. 写入二进制文件
  11. 读出二进制文件
  12. 读写TXT文件
  13. 退出

 

​
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define MAXSIZE 2        //初始数组大小
#define MATHSCORE 1       //数学成绩标识
#define CHINESESCORE 2    //语文成绩标识
#define ASC 3             //升序
#define DESC 4            //降序
#define DELETEDATA 7      //删除
#define SEARCHDATA 8      //查找
#define MODIFYDATA 9      //修改

//定义枚举
enum CHOOSE{
	INPUT=1,            //信息输入
	SUMSCORE,           //总分
	AVGSCORE,           //平均分
	MAXSCORE,           //最高成绩
	MINSCORE,           //最低成绩
	SORTSCORE,          //成绩排序
	DELETEMESSAGE,      //删除
	SEARCHMESSAGE,      //查找
	MODIFYSCORE,        //修改
	SAVEFILE,           //保存
	READFILE,           //读取
	WRFILE,             //读写
	EXIT                //退出
};
//定义学生成绩结构体
typedef struct Score_tlg
{
	float ChineseScore;
	float MathScore;
}SCORE;
//定义学生基本信息结构体
typedef struct Student_tlg
{
	long num;
	char name[20];
	SCORE score;
	int Size;   //当前信息最大个数(用于数组扩容判断)
}STUDENT;
void print(STUDENT stu[], int length);          //打印函数声明
void printOne(STUDENT stu);                     //打印一个学生信息函数声明       
void arr_Dilatation(STUDENT* stu, int length);  //数组扩容声明
//查询科目选项
int choose_Course()
{
	int choice;
	printf("请输入您想选择的科目: \n1 --- 数学  2 --- 语文 \n");
	scanf("%d", &choice);
	return choice;
}
//排序顺序选项
int choose_Sorttype()
{
	int choice;
	printf("请输入您想升序还是降序: \n3 --- 升序 4 --- 降序 \n");
	scanf("%d", &choice);
	return choice;
}
//信息输入
void InitMessage(STUDENT *stu,int* length)
{
	if (*length == stu->Size)
	{
		arr_Dilatation(stu, *length);
	}
	printf("请输入学生的学号,姓名,语文成绩,数学成绩信息: \n");
	scanf("%d %s %f %f", &stu[*length].num, stu[*length].name, 
						 &stu[*length].score.ChineseScore, 
						 &stu[*length].score.MathScore);
	(*length)++;   //注意运算的问题
	printf("输入成功!\n");
}
//总分
float agg_Score(STUDENT *stu,int length,int scoretype)  //scoretype成绩类型 传1为数学  传2为语文
{
	float math_sum = 0;
	float chin_sum = 0;
	if (scoretype == MATHSCORE)  //数学
	{
		for (int i = 0; i < length; i++)
		{
			math_sum += stu[i].score.MathScore;
		}
		return math_sum;
	}
	if (scoretype == CHINESESCORE)
	{
		for (int i = 0; i < length; i++)
		{
			chin_sum += stu[i].score.ChineseScore;
		}
		return chin_sum;
	 }
}
//平均分
float avg_Score(STUDENT *stu, int length,int scoretype)
{
	float avg;
	avg = agg_Score(stu, length, scoretype)/length;
	return avg;
}
//交换函数
void swap(STUDENT* a, STUDENT* b)
{
	STUDENT temp = *a;
	*a = *b;
	*b = temp;
}
//成绩高低排序
void sort_Score(STUDENT* stu, int length, int scoretype, int sorttype)  //4  降序  3升序
{
	for (int i = 0; i < length - 1; i++)
	{
		for (int j = 0; j < length - i - 1; j++)
		{
			if (scoretype == MATHSCORE)  //数学
			{
				if (sorttype == ASC)   //升序
				{
					if (stu[j].score.MathScore > stu[j + 1].score.MathScore)
					{
						swap(&stu[j], &stu[j + 1]);
					}
				}
				else   //降序
				{
					if (stu[j].score.MathScore < stu[j + 1].score.MathScore)
					{
						swap(&stu[j], &stu[j + 1]);
					}
				}
			}
			else   //语文
			{
				if (sorttype == ASC)   //升序
				{
					if (stu[j].score.ChineseScore > stu[j + 1].score.ChineseScore)
					{
						swap(&stu[j], &stu[j + 1]);
					}
				}
				else   //降序
				{
					if (stu[j].score.ChineseScore < stu[j + 1].score.ChineseScore)
					{
						swap(&stu[j], &stu[j + 1]);
					}
				}
			}
		}
	}
	print(stu, length);
}
//最高成绩
STUDENT max_Score(STUDENT stu[], int length, int scoretype)
{
	STUDENT studentMax = stu[0];
	if (scoretype == MATHSCORE)  //数学最高
	{
		for (int i = 1; i < length; i++)
		{
			if (studentMax.score.MathScore < stu[i].score.MathScore)
			{
				studentMax = stu[i];
			}
		}
	}
	else
	{
		for (int i = 1; i < length; i++)
		{
			if (studentMax.score.ChineseScore < stu[i].score.ChineseScore)
			{
				studentMax = stu[i];
			}
		}
	}
	return studentMax;
}
//最低成绩
STUDENT min_Score(STUDENT stu[], int length, int scoretype)
{
	STUDENT studentMin = stu[0];
	if (scoretype == MATHSCORE)  //数学最低
	{
		for (int i = 1; i < length; i++)
		{
			if (studentMin.score.MathScore > stu[i].score.MathScore)
			{
				studentMin = stu[i];
			}
		}
	}
	else
	{
		for (int i = 1; i < length; i++)
		{
			if (studentMin.score.ChineseScore > stu[i].score.ChineseScore)
			{
				studentMin = stu[i];
			}
		}
	}
	return studentMin;
}
//根据姓名删除信息
void delete_Message(STUDENT* stu,int* length,char* name)
{
	for (int i = 0; i < *length; i++)
	{
		if (strcmp(stu[i].name,name) == 0)  //找到学生
		{
			for (int j = i; j < *length; j++)
			{
				stu[j] = stu[j + 1];  //元素覆盖
			}
			//stu[*length - 1] = (STUDENT){ 0 };  //将最后一个元素置为空
			(*length)--;
			printf("该学生信息已经删除\n");
			break;
		}
	}
}
//按姓名查找
void seek_Message(STUDENT* stu, int* length, char* name)
{
	for (int i = 0; i < *length; i++)
	{
		if (strcmp(stu[i].name, name) == 0)  //找到学生
		{
			printOne(stu[i]);
			break;
		}
	}
}
//数组扩容
void arr_Dilatation(STUDENT* stu,int length)
{
	(STUDENT*)realloc(stu,sizeof(STUDENT)*length * 2);
	stu->Size = 2 * length;
} 
//按照学号姓名修改成绩
void modify_Score(STUDENT* stu, int length, char* name, int scoretype)
{
	for (int i = 0; i < length; i++)
	{
		if (strcmp(stu[i].name, name) == 0)  //找到学生
		{
			float math = 0;
			float chinese = 0;
			if (scoretype == MATHSCORE)  //修改数学
			{
				printf("请输入您想修改%s数学成绩: ", stu[i].name);
				scanf("%f", &math);
				stu[i].score.MathScore = math;
			}
			else if (scoretype == CHINESESCORE)  //修改语文
			{
				printf("请输入您想修改%s语文成绩: ", stu[i].name);
				scanf("%f", &chinese);
				stu[i].score.ChineseScore = chinese;
			}
			else     //均修改
			{
				printf("请输入您想修改%s数学和语文成绩: ", stu[i].name);
				scanf("%f %f", &math,&chinese);
				stu[i].score.MathScore = math;
				stu[i].score.ChineseScore = chinese;
			}
		}
	}
}
//打印所有信息
void print(STUDENT stu[], int length)
{
	for (int i = 0; i < length; i++)
	{
		printf("学号: %d\t姓名: %s\t数学成绩: %.2f\t\t语文成绩: %.2f\n", 
		stu[i].num, stu[i].name, stu[i].score.MathScore, stu[i].score.ChineseScore);
	}
}
//打印一个学生的信息
void printOne(STUDENT stu)
{
		printf("学号: %d\t姓名: %s\t数学成绩: %.2f\t\t语文成绩: %.2f\n",
		stu.num, stu.name, stu.score.MathScore, stu.score.ChineseScore);
}
//写入二进制文件
void saveFile(STUDENT* stu,int length)
{
	FILE* fp = fopen("./student.data", "wb");   //二进制写入
	if (NULL == fp)
	{
		printf("文件打开失败!\n");
		return;
	}
	fwrite(stu, sizeof(STUDENT), length, fp);
	fclose(fp);
	printf("数据写入文件成功!");
}
//从文件中读取二进制文件
void readFile(STUDENT* stu,int length)
{
	FILE* fp = fopen("./student.data", "r");
	if (NULL == fp)
	{
		printf("文件打开失败!\n");
		return;
	}
	do
	{
		fread(stu + length, sizeof(STUDENT), length, fp);
		if (feof)  //是否到文件末尾
		{
			break;
		}
		length++;
	} while (1);
	fclose(fp);
}
//读写TXT文件
void rwFile(STUDENT* stu, int* length)
{
	FILE* fp = fopen("./student.txt", "w+");
	if (NULL == fp)
	{
		printf("文件打开失败!\n");
		return;
	}
	for (int i = 0; i < *length; i++)  //写入文件
	{
		fprintf(fp, "%d\t%s\t%.2f\t%.2f\n", stu[i].num, stu[i].name, 
										 stu[i].score.MathScore, 
										 stu[i].score.ChineseScore);
	}
	printf("文件写入成功!\n");
	//文件读取
	rewind(fp);  //重置文件指针到文件开头
	//开辟缓存空间
	STUDENT* pstu = (STUDENT*)malloc(sizeof(STUDENT)*(*length));
	for (int i = 0; ; i++)
	{
		//文件读取
		int isok = fscanf(fp, "%d\t%s\t%f\t%f", &stu[i].num, stu[i].name, 
												&stu[i].score.MathScore, 
												&stu[i].score.ChineseScore);
		if (isok == EOF)
		{
			break;
		}
		printf("学号: %d\t姓名: %s\t数学成绩: %.2f\t\t语文成绩: %.2f\n",
							stu[i].num, stu[i].name, stu[i].score.MathScore, 
							stu[i].score.ChineseScore);
	}
	fclose(fp);
	free(pstu);
}
//菜单
void menu(STUDENT *stu, int* length)
{
	system("color 02");       //设置控制台背景颜色以及字体颜色
	printf("\n\n");
	printf("\t\t**************************************\n");
	printf("\t\t********** 1--信息输入           *****\n");
	printf("\t\t********** 2--总分               *****\n");
	printf("\t\t********** 3--平均分             *****\n");
	printf("\t\t********** 4--最高成绩           *****\n");
	printf("\t\t********** 5--最低成绩           *****\n");
	printf("\t\t********** 6--成绩排序           *****\n");
	printf("\t\t********** 7--删除信息           *****\n");
	printf("\t\t********** 8--查找信息           *****\n");
	printf("\t\t********** 9--按学号姓名修改成绩 *****\n");
	printf("\t\t********** 10--写入二进制文件    *****\n");
	printf("\t\t********** 11--读出二进制文件    *****\n");
	printf("\t\t********** 12--读写TXT文件       *****\n");
	printf("\t\t********** 13--退出              *****\n");
	printf("\t\t**************************************\n");
	printf("\n\n");
	int choice = 0;
	char name[10] = " ";
	printf("请输入您想执行的操作: \n");
	scanf("%d", &choice);
	switch (choice)
	{
	case INPUT:
		InitMessage(stu, &(*length));
		break;
	case SUMSCORE:
		printf("总分为: %.2f\t\n", agg_Score(stu, *length, choose_Course()));
		break;
	case AVGSCORE:
		printf("平均分为: %.2f\t\n", avg_Score(stu, *length, choose_Course()));
		break;
	case MAXSCORE:
		printOne(max_Score(stu, *length, choose_Course()));
		break;
	case MINSCORE:
		printOne(min_Score(stu, *length, choose_Course()));
		break;
	case SORTSCORE:
		sort_Score(stu, *length, choose_Course(), choose_Sorttype());
		break;
	case DELETEMESSAGE:
		printf("请输入您想删除的学生的姓名: \n");
		scanf("%s", name);
		delete_Message(stu, &(*length), name);
		break;
	case SEARCHMESSAGE:
		printf("请输入您想查找的学生的姓名: \n");
		scanf("%s", name);
		seek_Message(stu, &(*length), name);
		break;
	case MODIFYSCORE:
		printf("请输入您想修改的学生的姓名: \n");
		scanf("%s", name);
		modify_Score(stu, *length, name, choose_Course());
		break;
	case SAVEFILE:
		saveFile(stu, *length);
		break;
	case READFILE:
		readFile(stu, *length);
		break;
	case WRFILE:
		rwFile(stu, &(*length));
		break;
	case EXIT:
		exit(1);
	default:
		printf("输入错误,请重新输入!\n");
		break;
	}
}
int main()
{
	srand((unsigned int)time(NULL));
	STUDENT stu[MAXSIZE] = { 0 };
	stu->Size = MAXSIZE;
	int curSize = 0;   //当前元素个数   改变结构体组成时注意插入数据的结构体结构
	//循环插入元素
	for (int i = 0; i < 10; i++)
	{
		stu[i] = (STUDENT){ rand() % 100 + 401100, "张三", 
							rand() % 60 + (float)40.00,
						    rand() % 60 + (float)40.00 };  //随机生成
		curSize++;
	}
	while (1)
	{
		system("CLS");             //清屏
		menu(stu, &curSize);
		system("pause");
	}

	system("pause");
	return 0;
}

​


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