C语言实现学生信息管理系统（附原码）-创新互联

本人的C语言学习完后，用所学的知识自己实现了一个学生管理系统，新手一个，代码还有待完善，欢迎大家在评论区指出错误！

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二、函数的目录 

三、程序介绍 

1.主要功能：添加学生信息、打印学生信息、查找学生信息、添加学生信息、修改学生信息、计算学生成绩、删除学生信息。

2.实现思路：本系统用的是链表(个人感觉链表很好用)来实现添加、查找、添加等操作，没用使用数据库，所有数据都放在了堆区。

3.文件介绍：本系统中使用了三个文件 main.c、Func.c、Func.h。

四、系统原码

main.c介绍

main函数这里只调用了login();这个函数

#define _CRT_SECURE_NO_WARNINGS 1
#include#include#include#include "Func.h"


int main()
{
	//账号登陆
	login();

	system("pause");
	return 0;
}

Func.h介绍

主要就是函数还有结构体的声明

#pragma once
#define MAX 64 //将数组大小统一

typedef struct user //管理员的id 和 密码
{
	char id[MAX];
	char password[MAX];
}User;

typedef struct student
{
	char name[MAX];    //学生姓名
	char sex[MAX];     //学生性别
	char num[MAX];     //学生学号
	int Chinese;       //语文成绩
	int Mathematics;   //数学成绩
	int English;       //英语成绩
	int Computer;      //计算机成绩
}STU;

//学生链表
struct stu_LinkList
{
	//数据域
	STU student;
	//指针域
	struct stu_LinkList* next;
};

//主函数声明

//登陆函数
extern void login();
//打印主界面
extern void print_manu();
//添加学生信息
extern struct stu_LinkList* input_information();
//打印学生信息
extern void print_information();
//查找学生信息
extern void search_information();
//添加学生信息
extern void increase_information();
//修改学生信息
extern void modify_information();
//计算学生成绩
extern void calc();
//删除学生信息
extern void del_information();
//退出程序
extern void exit_project();


/
//自定义函数声明

//表头
extern void print_table();
//总成绩表头
extern void print_table_add();
//平均数表头
extern void print_table_ave();


/
//查询子函数声明

//姓名查询
extern void search_by_name();
//性别查询
extern void search_by_sex();
//学号查询
extern void search_by_num();

//
//计算子函数声明

//计算总成绩
extern void calc_sum();
//计算平均数
extern void calc_ave();

//
//删除子函数声明

//删除单个学生
extern void del_priv_stu();
//删除所有学生
extern void del_all_stu();

Func.c介绍

这里主要是函数效果的实现

#define _CRT_SECURE_NO_WARNINGS 1
#pragma warning(disable : 6031) //消除c6031警告，C6031返回值被忽略：“scanf”解决办法
#include#include#include#include "Func.h"

//学生链表头节点(全局变量)
struct stu_LinkList* Header = NULL;
//登陆函数
void login()
{
	//初始化管理员的id和密码
	User user[2] = { { "Leo", "123456" }, {"bob", "123456"} };

	char password[MAX] = {0}; //密码
	char id[MAX] = {0}; //用户名
	int num = 1; //记录登录次数
	int chance = 3; //机会次数
	while (1)
	{
		int isTrue = 0; //用来判断是否登录成功

		printf("----------  请输入用户名  ----------\n");
		scanf("%s", id);
		getchar();

		printf("----------  请输入密码  ----------\n");
		scanf("%s", password);
		getchar();

		if (num<= 3)
		{
			for (int i = 0; i< sizeof(user) / sizeof(user[0]); i++)
			{
				if (strcmp(user[i].id, id) == 0 && strcmp(user[i].password, password) == 0)
				{
					printf("登陆成功！\n");
					//打印界面
					print_manu();
					isTrue = 1;
				}
			}
			if (isTrue != 1)
			{
				num++;
				
				printf("输入错误，您还有%d次机会\n", --chance);
				if (chance == 0)
				{
					printf("三次均输入失败，退出程序\n");
					break;
				}
			}
			else
			{
				break;
			}
		}
		printf("按回车重新输入\n");
		getchar();
		system("cls");
	}
}

//打印主界面
void print_manu()
{
	
	system("cls");
	int num = 0;   //选择要执行的序号
	printf("**********************************************\n");
	printf("***********欢迎使用高校学生管理系统***********\n");
	printf("**********************************************\n");
	printf("\t\t1.输入学生信息\t\t\n");
	printf("\t\t2.查找学生信息\t\t\n");
	printf("\t\t3.打印学生信息\t\t\n");
	printf("\t\t4.添加学生信息\t\t\n");
	printf("\t\t5.修改学生信息\t\t\n");
	printf("\t\t6.计算学生成绩\t\t\n");
	printf("\t\t7.删除学生信息\t\t\n");
	printf("\t\t8.退出系统\t\t\n");
	printf("**********************************************\n");
	printf("**********************************************\n");
	
	printf("请输入您要执行的操作序号：");
	scanf("%d", &num);
	getchar();
	switch (num)
	{
	case 1:
		//添加学生信息
		Header = input_information();
		print_manu();
		break;
	case 2:
		//查找学生信息
		search_information();
		break;
	case 3:
		//打印学生信息
		print_information(Header);
		break;
	case 4:
		//添加学生信息
		increase_information();
		break;
	case 5:
		//修改学生信息
		modify_information();
		break;
	case 6:
		//计算学生成绩
		calc();
		break;
	case 7:
		//删除学生信息
		del_information();
		break;
	case 8:
		//退出系统
		exit_project();
		break;
	default:
		printf("对不起，没有该操作,按回车可以重新选择\n");
		getchar();
		print_manu();
		break;
	}
}

//输入学生信息
struct stu_LinkList* input_information()
{
	
	char isAgain; //用来判断是否继续输入
	//创建一个头节点
	struct stu_LinkList* pHeader = (struct stu_LinkList*)malloc(sizeof(struct stu_LinkList));
	if (pHeader == NULL)
	{
		printf("抱歉，创建失败\n");
		return;
	}
	//初始化头节点
	pHeader->next = NULL;
	memset(&pHeader->student, 0, sizeof(STU));

	//创建一个尾节点指针，用来记录尾节点的位置，方便插尾
	struct stu_LinkList* pTail = pHeader;

	//设置一个学生结构体来接收输入的值
	STU tmp;
	memset(&tmp, 0, sizeof(STU));
again:
	system("cls");
	//输入学生信息
	printf("输入学生姓名：\n");
	scanf("%s", tmp.name);
	getchar();

	printf("输入学生性别：\n");
	scanf("%s", tmp.sex);
	getchar();

	printf("输入学生学号：\n");
	scanf("%s", tmp.num);
	getchar();

	printf("输入学生语文成绩：\n");
	scanf("%d", &tmp.Chinese);
	getchar();

	printf("输入学生数学成绩：\n");
	scanf("%d", &tmp.Mathematics);
	getchar();

	printf("输入学生英语成绩：\n");
	scanf("%d", &tmp.English);
	getchar();

	printf("输入学生计算机成绩：\n");
	scanf("%d", &tmp.Computer);
	getchar();
	
	//创建一个新的学生节点
	struct stu_LinkList* stu_Node = (struct stu_LinkList*)malloc(sizeof(struct stu_LinkList));
	stu_Node->student = tmp;
	stu_Node->next = NULL;
	//建立关系
	pTail->next = stu_Node;
	pTail = stu_Node;

	//是否继续添加学生信息
	printf("继续添加学生信息请按Y\t返回主页面请按N\n");
	scanf("%c", &isAgain);
	if (isAgain == 'Y')
	{
		goto again;
	}
	else if(isAgain == 'N')
	{
		return pHeader;
	}
}

//表头
void print_table()
{
	system("cls");
	printf("+--------+--------+--------+--------+--------+--------+----------+\n");
	printf("|  姓名  |  性别  |  学号  |  语文  |  数学  |  英语  |  计算机  |\n");
	printf("+--------+--------+--------+--------+--------+--------+----------+\n");
}

//打印学生信息
void print_information()
{
	system("cls");
	int isReturn; //是否返回
	
	//判断系统里是否有学生信息（没有输入过信息）
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
	}
	//判断已经进行过信息的输入，但是又将全部数据删除的情况
	if (Header->next == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
	}
	
	print_table();
	struct stu_LinkList* pCurrent = Header->next;
	while (pCurrent != NULL)
	{
		printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d   |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
			pCurrent->student.Chinese, pCurrent->student.Mathematics,
			pCurrent->student.English, pCurrent->student.Computer);
		pCurrent = pCurrent->next;
		printf("+--------+--------+--------+--------+--------+--------+----------+\n");
	}
	printf("返回上一级请输入 1\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		print_manu();
	}
}

//查找学生信息
void search_information()
{
	char isAgain;
	int num;
	system("cls");
	printf("**********************************************\n");
	printf("**********************************************\n");
	printf("\t\t1.按姓名查询\t\t\n");
	printf("\t\t2.按性别查询\t\t\n");
	printf("\t\t3.按学号查询\t\t\n");
	printf("\t\t4.返回主界面\t\t\n");
	printf("**********************************************\n");
	printf("**********************************************\n");
	printf("请输入您要执行的操作：");
	scanf("%d", &num);
	getchar();
	
	if (num == 1)
	{
		//姓名查询
		search_by_name();
	}
	else if (num == 2)
	{
		//性别查询
		search_by_sex();
	}
	else if (num == 3)
	{
		//学号查询
		search_by_num();
	}
	else if (num == 4)
	{
		print_manu();
	}
	else
	{
		printf("抱歉，没有该选项\n");
		printf("重新选择请按 Y,返回上一级请按 N\n");
		scanf("%c", &isAgain);
		getchar();
		if (isAgain == 'Y')
		{
			search_information();
		}
		else if (isAgain == 'N')
		{
			print_manu();
		}
	}
}

//姓名查询
void search_by_name()
{
	system("cls");
	int isReturn = 0; //是否返回
	int isLive = 0; //该学生是否存在
	char name[MAX];
	
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按1\t返回上一级请按2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			search_information();
		}
	}
	printf("请输入您要查询的姓名：\n");
	scanf("%s", name);
	getchar();
	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	print_table();
	while (pCurrent != NULL)
	{
		//判断时候有该姓名的学生
		
		if (strcmp(name, pCurrent->student.name) == 0)
		{
			printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d   |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
				pCurrent->student.Chinese, pCurrent->student.Mathematics,
				pCurrent->student.English, pCurrent->student.Computer);
			printf("+--------+--------+--------+--------+--------+--------+----------+\n");
			isLive++;
		}
		pCurrent = pCurrent->next;
	}
	if (isLive == 0)
	{
		system("cls");
		printf("抱歉，并未找到该学生\n");
	}
	//结束返回
	printf("重新查找请按 1\t返回上一级请按 2\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		search_by_name();
	}
	else if (isReturn == 2)
	{
		search_information();
	}
}

//按照性别查询
void search_by_sex()
{
	system("cls");
	int isReturn = 0; //是否返回
	int isLive = 0; //该学生是否存在
	char sex[MAX];
	
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按1\t返回上一级请按2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			search_information();
		}
	}
	printf("请输入您要查询的性别：\n");
	scanf("%s", sex);
	getchar();
	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	print_table();//打印表头
	while (pCurrent != NULL)
	{
		//判断时候有该性别的学生
		if (strcmp(sex, pCurrent->student.sex) == 0)
		{
			
			printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d   |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
				pCurrent->student.Chinese, pCurrent->student.Mathematics,
				pCurrent->student.English, pCurrent->student.Computer);
			printf("+--------+--------+--------+--------+--------+--------+----------+\n");
			isLive++;
		}
		pCurrent = pCurrent->next;
	}
	if (isLive == 0)
	{
		system("cls");
		printf("抱歉，并未找到该学生\n");
	}
	//结束返回
	printf("重新查找请按 1\t返回上一级请按 2\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		search_by_sex();
	}
	else if (isReturn == 2)
	{
		search_information();
	}
}

//按学号查询
void search_by_num()
{
	system("cls");
	int isReturn = 0; //是否返回
	int isLive = 0; //该学生是否存在
	char num[MAX];
	
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按1\t返回上一级请按2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			search_information();
		}
	}
	printf("请输入您要查询的学号：\n");
	scanf("%s", num);
	getchar();
	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	print_table();
	while (pCurrent != NULL)
	{
		//判断时候有该性别的学生
		if (strcmp(num, pCurrent->student.num) == 0)
		{
			printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d   |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
				pCurrent->student.Chinese, pCurrent->student.Mathematics,
				pCurrent->student.English, pCurrent->student.Computer);
			printf("+--------+--------+--------+--------+--------+--------+----------+\n");
			isLive++;
		}
		pCurrent = pCurrent->next;
	}
	if (isLive == 0)
	{
		system("cls");
		printf("抱歉，并未找到该学生\n");
	}
	//结束返回
	printf("重新查找请按 1\t返回上一级请按 2\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		search_by_num();
	}
	else if (isReturn == 2)
	{
		search_information();
	}
}

//添加学生信息
void increase_information()
{
	system("cls");
	int isReturn = 0; //是否返回
	char isAgain; //用来判断是否继续输入
	if (Header == NULL)
	{
		printf("请先输入学生信息！\n");
		printf("返回主页面请按1\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
	}

	//创建一个尾节点指针，用来记录尾节点的位置，方便插尾
	struct stu_LinkList* pTail = Header;
	//输入要添加的学生信息
	STU tmp;
	memset(&tmp, 0, sizeof(STU));
again:
	system("cls");
	//输入学生信息
	printf("输入学生姓名：\n");
	scanf("%s", tmp.name);
	getchar();

	printf("输入学生性别：\n");
	scanf("%s", tmp.sex);
	getchar();

	printf("输入学生学号：\n");
	scanf("%s", tmp.num);
	getchar();

	printf("输入学生语文成绩：\n");
	scanf("%d", &tmp.Chinese);
	getchar();

	printf("输入学生数学成绩：\n");
	scanf("%d", &tmp.Mathematics);
	getchar();

	printf("输入学生英语成绩：\n");
	scanf("%d", &tmp.English);
	getchar();

	printf("输入学生计算机成绩：\n");
	scanf("%d", &tmp.Computer);
	getchar();

	//进行信息比对，如果有重复信息输入，将会提示
	struct stu_LinkList* pCurrent = Header->next;
	while (pCurrent != NULL)
	{
		if (strcmp(tmp.name, pCurrent->student.name) == 0 && strcmp(tmp.sex, pCurrent->student.sex) == 0 && strcmp(tmp.num, pCurrent->student.num) == 0)
		{
			printf("抱歉，系统已有该同学信息\n");
			printf("重新输入请按 Y\t返回主界面请按 N\n");
			scanf("%c", &isAgain);
			getchar();
			if (isAgain == 'Y')
			{
				increase_information();
			}
			else if (isAgain == 'N')
			{
				print_manu();
			}
		}
		pCurrent = pCurrent->next;
	}

	//遍历链表找到尾节点
	while (pTail->next != NULL)
	{
		pTail = pTail->next;
	}
	//创建一个新的学生节点
	struct stu_LinkList* stu_Node = (struct stu_LinkList*)malloc(sizeof(struct stu_LinkList));
	stu_Node->student = tmp;
	stu_Node->next = NULL;
	//建立关系
	pTail->next = stu_Node;
	pTail = stu_Node;

	//是否继续添加学生信息
	printf("继续添加学生信息请按 Y，返回主界面请按 N\n");
	scanf("%c", &isAgain);
	if (isAgain == 'Y')
	{
		goto again;
	}
	else if (isAgain == 'N')
	{
		print_manu();
	}
}

//修改学生信息
void modify_information()
{
	system("cls");
	char isAgain; //用来判断是否继续输入
	int isReturn = 0; //是否返回
	//判断系统里是否有学生信息
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
	}

	//输入要修改的学生信息
	STU tmp;
again:
	system("cls");
	printf("请输入你要查找的学生信息\n");
	printf("输入学生姓名：\n");
	scanf("%s", tmp.name);
	getchar();

	printf("输入学生性别：\n");
	scanf("%s", tmp.sex);
	getchar();

	printf("输入学生学号：\n");
	scanf("%s", tmp.num);
	getchar();

	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	//该信息的位置
	struct stu_LinkList* information_pos = NULL;
	while (pCurrent != NULL)
	{
		if (strcmp(tmp.name, pCurrent->student.name) == 0 && strcmp(tmp.sex, pCurrent->student.sex) == 0 && strcmp(tmp.num, pCurrent->student.num) == 0)
		{
			printf("找到该同学信息\n");
			printf("打印学生信息Y\t不打印N\n");
			scanf("%c", &isAgain);
			if (isAgain == 'Y')
			{
				print_table();
				printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d   |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
					pCurrent->student.Chinese, pCurrent->student.Mathematics,
					pCurrent->student.English, pCurrent->student.Computer);
				printf("+--------+--------+--------+--------+--------+--------+----------+\n");
			}
			else if (isAgain == 'N')
			{
				system("cls");
			}
			
			//记录信息位置
			information_pos = pCurrent;
		}
		pCurrent = pCurrent->next;
	}
	if (information_pos == NULL)
	{
		system("cls");
		printf("未找到该同学信息\n");
		//是否继续修改学生信息
		printf("继续修改学生信息Y\t返回主界面N\n");
		scanf("%c", &isAgain);
		getchar();
		if (isAgain == 'Y')
		{
			goto again;
		}
		else if (isAgain == 'N')
		{
			print_manu();
		}
	}
	printf("请修改学生信息\n");
	printf("输入学生姓名：\n");
	scanf("%s", tmp.name);
	getchar();

	printf("输入学生性别：\n");
	scanf("%s", tmp.sex);
	getchar();

	printf("输入学生学号：\n");
	scanf("%s", tmp.num);
	getchar();

	printf("输入学生语文成绩：\n");
	scanf("%d", &tmp.Chinese);
	getchar();

	printf("输入学生数学成绩：\n");
	scanf("%d", &tmp.Mathematics);
	getchar();

	printf("输入学生英语成绩：\n");
	scanf("%d", &tmp.English);
	getchar();

	printf("输入学生计算机成绩：\n");
	scanf("%d", &tmp.Computer);
	getchar();

	//修改学生信息
	information_pos->student = tmp;
	printf("修改成功！\n");
	printf("继续修改学生信息Y\t返回主界面N\n");
	scanf("%c", &isAgain);
	getchar();
	if (isAgain == 'Y')
	{
		goto again;
	}
	else if (isAgain == 'N')
	{
		print_manu();
	}
}

//总成绩表头
void print_table_add()
{
	system("cls");
	printf("+--------+--------+--------+--------+--------+--------+----------+----------+\n");
	printf("|  姓名  |  性别  |  学号  |  语文  |  数学  |  英语  |  计算机  |  总成绩  |\n");
	printf("+--------+--------+--------+--------+--------+--------+----------+----------+\n");
}

//平均数表头
void print_table_ave()
{
	system("cls");
	printf("+--------+--------+--------+--------+--------+--------+----------+----------+\n");
	printf("|  姓名  |  性别  |  学号  |  语文  |  数学  |  英语  |  计算机  |  平均数  |\n");
	printf("+--------+--------+--------+--------+--------+--------+----------+----------+\n");
}

//计算学生成绩
void calc()
{
	char isAgain;//是否继续
	int num;
	system("cls");
	printf("**********************************************\n");
	printf("**********************************************\n");
	printf("\t\t1.计算总成绩\t\t\n");
	printf("\t\t2.计算平均数\t\t\n");
	printf("\t\t3.返回主界面\t\t\n");
	printf("**********************************************\n");
	printf("**********************************************\n");
	printf("请输入您要执行的操作：");
	scanf("%d", &num);
	getchar();

	if (num == 1)
	{
		//计算总成绩
		calc_sum();
	}
	else if (num == 2)
	{
		//计算平均数
		calc_ave();
	}
	else if (num == 3)
	{
		print_manu();
	}
	else
	{
		printf("抱歉，没有该选项\n");
		printf("重新选择请按 Y,返回主界面请按 N\n");
		scanf("%c", &isAgain);
		getchar();
		if (isAgain == 'Y')
		{
			calc();
		}
		else if (isAgain == 'N')
		{
			print_manu();
		}
	}
}

//计算总成绩
void calc_sum()
{
	system("cls");
	int sum = 0;//总成绩变量
	int isReturn = 0; //是否返回
	//判断系统里是否有学生信息
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\t返回上一级请按 2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			calc();
		}
	}
	
	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	print_table_add();
	while (pCurrent != NULL)
	{
		sum = pCurrent->student.Chinese + pCurrent->student.Mathematics + pCurrent->student.English + pCurrent->student.Computer;
		printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d     | %5d    |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
			pCurrent->student.Chinese, pCurrent->student.Mathematics,
			pCurrent->student.English, pCurrent->student.Computer, sum);
		printf("+--------+--------+--------+--------+--------+--------+----------+----------+\n");
		pCurrent = pCurrent->next;
	}
	printf("返回主页面请按 1\t返回上一级请按 2\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		print_manu();
	}
	else if (isReturn == 2)
	{
		calc();
	}
}

//计算平均数
void calc_ave()
{
	system("cls");
	float ave = 0;//平均数变量

	int isReturn = 0; //是否返回
	//判断系统里是否有学生信息
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\t返回上一级请按 2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			calc();
		}
	}

	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	print_table_ave();
	while (pCurrent != NULL)
	{
		ave = ((float)(pCurrent->student.Chinese + pCurrent->student.Mathematics + pCurrent->student.English + pCurrent->student.Computer)) * (float)0.25;
		printf("|%5s   |%5s   |%5s   |%5d   |%5d   |%5d   |%5d    |%5.2lf     |\n", pCurrent->student.name, pCurrent->student.sex, pCurrent->student.num,
			pCurrent->student.Chinese, pCurrent->student.Mathematics,
			pCurrent->student.English, pCurrent->student.Computer, ave);
		printf("+--------+--------+--------+--------+--------+--------+----------+----------+\n");
		pCurrent = pCurrent->next;
	}
	printf("返回主页面请按 1\t返回上一级请按 2\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		print_manu();
	}
	else if (isReturn == 2)
	{
		calc();
	}
}

//删除学生信息
void del_information()
{
	char isAgain;//是否继续
	int num;
	system("cls");
	printf("**********************************************\n");
	printf("**********************************************\n");
	printf("\t\t1.删除单个学生\t\t\n");
	printf("\t\t2.删除全部学生\t\t\n");
	printf("\t\t3.返回主界面\t\t\n");
	printf("**********************************************\n");
	printf("**********************************************\n");
	printf("请输入您要执行的操作：");
	scanf("%d", &num);
	getchar();

	if (num == 1)
	{
		//删除单个学生
		del_priv_stu();
	}
	else if (num == 2)
	{
		//删除所有学生
		del_all_stu();
	}
	else if (num == 3)
	{
		print_manu();
	}
	else
	{
		printf("抱歉，没有该选项\n");
		printf("重新选择请按 Y,返回主界面请按 N\n");
		scanf("%c", &isAgain);
		getchar();
		if (isAgain == 'Y')
		{
			del_information();
		}
		else if (isAgain == 'N')
		{
			print_manu();
		}
	}
}

//删除单个学生
void del_priv_stu()
{
	int isReturn = 0; //是否返回
	int isExist = 0;//判断信息是否存在
	char isAgain = 0;//是否继续删除
	//判断系统里是否有学生信息
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\t返回上一级请按 2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			del_information();
		}
	}
	
	//输入要修改的学生信息
	STU tmp;
	system("cls");
	printf("请输入你要删除的学生信息\n");
	printf("输入学生姓名：\n");
	scanf("%s", tmp.name);
	getchar();

	printf("输入学生性别：\n");
	scanf("%s", tmp.sex);
	getchar();

	printf("输入学生学号：\n");
	scanf("%s", tmp.num);
	getchar();

	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	//记录上一个节点的位置
	struct stu_LinkList* pPrev = Header;
	while (pCurrent != NULL)
	{
		if (strcmp(tmp.name, pCurrent->student.name) == 0 && strcmp(tmp.sex, pCurrent->student.sex) == 0 && strcmp(tmp.num, pCurrent->student.num) == 0)
		{
			pCurrent = pCurrent->next;
			free(pPrev->next);
			pPrev->next = NULL;
			//建立关系
			pPrev->next = pCurrent;
			isExist++;
			break;
		}
		pPrev = pCurrent;
		pCurrent = pCurrent->next;
	}
	if (isExist == 0)
	{
		system("cls");
		printf("未找到该同学信息\n");
		//是否继续删除学生信息
		printf("继续删除学生信息 Y\t返回上一级 N\n");
		scanf("%c", &isAgain);
		getchar();
		if (isAgain == 'Y')
		{
			del_priv_stu();
		}
		else if (isAgain == 'N')
		{
			del_information();
		}
	}
	if (isExist == 1)
	{
		system("cls");
		printf("删除成功\n");
		printf("继续删除学生信息 Y\t返回上一级 N\n");
		scanf("%c", &isAgain);
		getchar();
		if (isAgain == 'Y')
		{
			del_priv_stu();
		}
		else if (isAgain == 'N')
		{
			del_information();
		}
	}
}

//删除所有学生
void del_all_stu()
{
	system("cls");
	int isReturn = 0; //是否返回
	//判断系统里是否有学生信息
	if (Header == NULL)
	{
		printf("系统还没有学生信息！\n");
		printf("返回主页面请按 1\t返回上一级请按 2\n");
		scanf("%d", &isReturn);
		getchar();
		if (isReturn == 1)
		{
			print_manu();
		}
		else if (isReturn == 2)
		{
			del_information();
		}
	}
	//进行遍历
	struct stu_LinkList* pCurrent = Header->next;
	//记录下一个节点
	struct stu_LinkList* next_Node = NULL;
	while (pCurrent != NULL)
	{
		next_Node = pCurrent->next;
		free(pCurrent);
		pCurrent = NULL;
		pCurrent = next_Node;
	}
	Header->next = NULL;

	printf("删除成功\n");
	printf("返回上一级请按 1\n");
	scanf("%d", &isReturn);
	getchar();
	if (isReturn == 1)
	{
		del_information();
	}
}

//退出程序
void exit_project()
{
	system("cls");
	if (Header == NULL)
	{
		printf("感谢您的使用，已退出！\n");
		exit(0);
	}
	else if (Header->next == NULL)
	{
		//释放头节点
		free(Header);
		Header = NULL;
		printf("感谢您的使用，已退出！\n");
		exit(0);
	}
	else
	{
		//进行遍历
		struct stu_LinkList* pCurrent = Header->next;
		//记录下一个节点
		struct stu_LinkList* next_Node = NULL;
		while (pCurrent != NULL)
		{
			next_Node = pCurrent->next;
			free(pCurrent);
			pCurrent = NULL;
			pCurrent = next_Node;
		}
		Header->next = NULL;
		//释放头节点
		free(Header);
		Header = NULL;
		printf("感谢您的使用，已退出！\n");
		exit(0);
	}
}

五、总结

到这里这个学生管理系统就完成啦！这个当作自己的一个C语言结课作业，在写的过程中有一些逻辑参考了学生信息管理系统这篇文章，希望以上内容可以帮助到大家，如果有错误欢迎大家指出。

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