[C++知识库]程序设计基础大作业：学生信息管理系统plus（彩色界面，登录功能，文件操作，多文件）

目录

界面展示

康康代码

stdbill.c：

tool.c

stuact.c

student.c? （最核心的链表操作）

log.c

头文件

main.c

咱们书接上回，之前完成了学生系统的初版，但是奈何学校要答辩，身边的同学都在拼命的卷自己的系统，我自然是不能善罢甘休，

按照老师的要求，我将系统分为了ui层，逻辑业务层，功能实现层

然后又自己加了一点其他的功能，什么彩色显示啊，什么将数据存储在表格里啊，，，，

奈何最后提交的文档实在太拉跨，可以说是学的教训了

界面展示

话不多说，上图

?

?

?

?

查看分数统计

?

打印学生成绩单

?

康康代码

因为是多文件写成的代码，我会将代码与文件名一同注明

stdbill.c：

#define _CRT_SECURE_NO_WARNINGS 1//用来防止vs的莫名其妙的报错
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#include<windows.h>
#include"student.h"
#include"sys.h"
#include"log.h"
void sowhmess()//通用提示信息
{
	printf("对不起，您的输入有误......\n");
	printf("操作完毕，返回主菜单继续......\n");
}


//学生查看
void query(pstd heads)
{
	system("cls");
	printf("学生信息查看......\n");
	check_mains();
	int c = 0;
	scanf("%d", &c);
	switch (c)
	{
	case 1:system("cls"); sort_byname(heads); out(heads); break;//
	case 2:system("cls"); sort_byid(heads); out(heads); break;//
	case 3:system("cls"); showmajor(heads); break;//
	case 4:system("cls"); sort_s1(heads); out(heads); break;//
	case 5:system("cls"); sort_s2(heads); out(heads); break;//
	case 0:system("cls"); printf("退出查看。\n"); break;//
	default:system("cls"); printf("输入错误,退出当前界面。。。。\n");break;//
	}
	printf("操作完毕，返回主菜单继续......\n");
	system("pause");
}
//删除
void deletestu(pstd heads)
{
	system("cls");
	printf("学生信息删除......\n");
	fund_mains();
	int c = 0;
	scanf("%d", &c);
	switch (c)
	{
	case 1:deletes(heads, fundname(heads)); break;
	case 2:deletes(heads, fundid(heads)); break;
	case 0:system("cls"); printf("退出。\n"); break;
	default:printf("输入错误,退出当前界面。。。。\n"); break;
	}
	printf("操作完毕，返回主菜单继续......\n");
	system("pause");
	system("cls");

}
//分类查询
void querystu(pstd heads)
{
	system("cls");
	printf("学生分类查询......\n");
	fund_mains();
	int c = 0;
	scanf("%d", &c);
	switch (c)
	{
	case 1:system("cls"); outone(fundname(heads)); break;
	case 2:system("cls"); outone(fundid(heads)); break;
	case 0:system("cls"); printf("退出查询。\n"); break;
	default:system("cls"); printf("输入错误,退出当前界面。。。。\n"); break;
	}
	

	printf("操作完毕，返回主菜单继续......\n");
	system("pause");
	system("cls");

}
//更新
void updute(pstd heads)
{
	system("cls");
	printf("学生信息修改......\n");
	fund_mains();
	int c = 0;
	scanf("%d", &c);
	switch (c)
	{
	case 1:change(fundname(heads)); break;
	case 2:change(fundid(heads)); break;
	case 0:system("cls"); printf("退出修改。\n"); break;
	default:printf("输入错误,退出当前界面。。。。"); break;
	}
	

	printf("操作完毕，返回主菜单继续......\n");
	system("pause"); 
	system("cls");

}
//账号验证
int is_user(char* usera, char* userp)
{
	if (ismgid(usera,userp)==1)
	{
		printf("\t\t欢迎进入管理员端系统，请稍等.........\n");
		Sleep(1000);
		return 1;
	}
	else if (isstuid(usera,userp)==1)
	{
		printf("\t\t欢迎进入学生端系统，请稍等.........\n");
		Sleep(1000);
		return 2;
	}
		return 0;
}

tool.c

#define _CRT_SECURE_NO_WARNINGS 1
#include<windows.h> 
//引用的是函数库定义好了的函数，这里进行了封装，如果有兴趣的话可以去查查windows.h的文档
void color(char x)
{
	if (x >= 0 && x <= 15)
		SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), x);
	else
		SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 9);
}

stuact.c

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include"stdbill.h"
#include"student.h"
#include"log.h"
pstd main_mg(int x, pstd heads)
{
	system("cls");
	switch (x){
	case 1:
		system("cls"); heads = input(); system("cls"); break;
	case 2:
		system("cls"); adds(heads); system("pause"); system("cls");break;
	case 3:
		system("cls"); query(heads);  system("cls"); break;
	case 4:
		system("cls"); updute(heads); system("cls"); break;
	case 5:
		system("cls"); precent(heads); outtotal(heads); system("pause"); system("cls"); break;
	case 6:
		system("cls"); querystu(heads); system("cls"); break;
	case 7:
		system("cls"); save(heads); system("pause"); system("cls"); break;
	case 8:
		system("cls"); heads = read(); out(heads); system("pause"); system("cls"); break;
	case 9:
		system("cls"); deletestu(heads); system("cls"); break;
	case 10:
		system("cls"); sort_s2(heads); getmark(heads); system("cls"); break;
	case 0:
		system("cls"); printf("感谢使用\n"); Sleep(1000); system("pause");exit(-1); break;
	default:
		system("cls"); printf("手抖了？\n再试试？\n\n\n"); break;
	}
	return heads;
}
pstd main_stu(int x, pstd heads)
{
	system("cls");
	switch (x){
	case 1:
		system("cls"); query(heads); system("pause"); break;
	case 2:
		system("cls"); querystu(heads); system("pause"); break;
	case 3:
		system("cls"); sort_s2(heads); getmark(heads); system("cls"); break;
	case 0:
		system("cls"); printf("感谢使用\n"); Sleep(1000); system("pause"); exit(-1); break;
	default:
		system("cls"); printf("手抖了？\n再试试？\n\n\n"); break;
	}
	return heads;
}

void addid()
{
	addidhead();
	int x;
	printf("请输入你的选择！");
	scanf("%d", &x);
	if (x == 1){
		addstuid();
	}
	else if (x == 2){
		addmgid();
	}
	else {
		printf("选择错误！");
		return;
	}
}

int logtime(int x)
{
	switch (x){
	case 1:return login();
	case 2:system("cls"); addid(); system("cls"); break;
	default:
		break;
	}
	return -1;
}

int login()
{
	char usera[20], userp[20];
	int i;
	system("cls");
	head();
	printf("\t\t账户：");
	scanf("%s", usera);
	printf("\t\t密码：");
	for (i = 0; i < 20; i++){
		userp[i] = getch();
		if (userp[i] == '\r'){
			break;
		}
		printf("*");
	}
	userp[i] = '\0';
	 return is_user(usera, userp);
	
}

student.c? （最核心的链表操作）

#define _CRT_SECURE_NO_WARNINGS 1
#include"student.h" 
#include<stdio.h>
#include<string.h>
#include<malloc.h>
#include<stdlib.h>
#include<stdbool.h>
#include<windows.h>
#include"tool.h"
pstd input()//创建
{
	int n;
	int i;
	float x;
	char a[10];
	char b[7];
	char sb[7];
	char m[20];
	printf("请输入学生个数：\n");
	scanf("%d", &n);
	pstd ph = (pstd)malloc(sizeof(std));//头指针
	pstd pt = ph;//尾指针
	pt->pnext = NULL;//尾指针为空
	for (i = 1; i <= n; i++)
	{

		//数据输入
		printf("请输入第%d个学生的名字：\n", i);
		scanf("%s", a);
		printf("请输入第%d个学生的学号（6位）：\n", i);
		scanf("%s", b);
		if (i > 1 && haveid(ph, b) == 0) {
			printf("已存在该学生！\n");
			return NULL;
		}
		pstd pn = (pstd)malloc(sizeof(std));//开辟空间
		strcpy(pn->name, a);
		strcpy(pn->id, b);
		printf("请输入第%d个学生专业：\n", i);
		scanf("%s", m); strcpy(pn->major, m);
		printf("请输入第%d个学生的性别：\n", i);
		scanf("%s", sb); strcpy(pn->sex, sb);
		printf("请输入第%d个学生的语文成绩：\n", i);
		scanf("%f", &x); pn->s[0] = x;
		printf("请输入第%d个学生的数学成绩：\n", i);
		scanf("%f", &x); pn->s[1] = x;
		printf("请输入第%d个学生的英语成绩：\n", i);
		scanf("%f", &x); pn->s[2] = x;
		printf("请输入第%d个学生的物理成绩：\n", i);
		scanf("%f", &x); pn->s[3] = x;
		printf("请输入第%d个学生的化学成绩：\n", i);
		scanf("%f", &x); pn->s[4] = x;
		printf("请输入第%d个学生的生物成绩：\n", i);
		scanf("%f", &x); pn->s[5] = x;
		pn->t = pn->s[0] + pn->s[1] + pn->s[2] + pn->s[3] + pn->s[4] + pn->s[5];
		pn->a = pn->t / 6.0;
		pt->pnext = pn;//上次循环之前的尾指针指向新创建的节点
		pn->pnext = NULL;//新节点的指针域为空
		pt = pn;//新节点为尾节点
		system("cls");
	}
	return ph;

}
void out(pstd p)//输出
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	int i = 1;
	pstd pr = p->pnext;
	while (pr)
	{
		color(2);
		printf("序号：%d\n", i++);
		color(3);
		printf("姓名：%s ", pr->name);
		printf("学号：%s ", pr->id);
		printf("专业：%s ", pr->major);
		printf("性别：%s ", pr->sex);
		color(6);
		printf("\n");
		printf("语文：%5.2f ", pr->s[0]);
		printf("数学：%5.2f ", pr->s[1]);
		printf("英语：%5.2f ", pr->s[2]);
		printf("物理：%5.2f ", pr->s[3]);
		printf("化学：%5.2f ", pr->s[4]);
		printf("生物：%5.2f ", pr->s[5]);
		printf("\n");
		color(5);
		printf("总分：%5.2f", pr->t);
		printf("平均：%5.2f", pr->a);
		color(7);
		printf("\n");
		pr = pr->pnext;
	}
}
void sort_s1(pstd p)//低到高
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pur, cur, next, end;
	end = NULL;
	while (p->pnext != end)
	{
		for (pur = p, cur = pur->pnext, next = cur->pnext; next != end; pur = pur->pnext, cur = cur->pnext, next = next->pnext)
		{
			if (cur->t > next->t)
			{
				pur->pnext = next;
				cur->pnext = next->pnext;
				next->pnext = cur;
				pstd m = cur;
				cur = next;
				next = m;
			}
		}
		end = cur;
	}
}
void sort_s2(pstd p)//高到低
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	{
		pstd pur, cur, next, end;
		end = NULL;
		while (p->pnext != end)
		{
			for (pur = p, cur = pur->pnext, next = cur->pnext; next != end; pur = pur->pnext, cur = cur->pnext, next = next->pnext)
			{
				if (cur->t < next->t)
				{
					pur->pnext = next;
					cur->pnext = next->pnext;
					next->pnext = cur;
					pstd m = cur;
					cur = next;
					next = m;
				}
			}
			end = cur;
		}
	}
}
void sort_byname(pstd p)//姓名排序
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pur, cur, next, end;
	end = NULL;
	while (p->pnext != end)
	{
		for (pur = p, cur = pur->pnext, next = cur->pnext; next != end; pur = pur->pnext, cur = cur->pnext, next = next->pnext)
		{
			if (strcmp(cur->name, next->name) > 0)
			{
				pur->pnext = next;
				cur->pnext = next->pnext;
				next->pnext = cur;
				pstd m = cur;
				cur = next;
				next = m;
			}
		}
		end = cur;
	}
}
void sort_byid(pstd p)//学号排序
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pur, cur, next, end;
	end = NULL;
	while (p->pnext != end)
	{
		for (pur = p, cur = pur->pnext, next = cur->pnext; next != end; pur = pur->pnext, cur = cur->pnext, next = next->pnext)
		{
			if (strcmp(cur->id, next->id) > 0)
			{
				pur->pnext = next;
				cur->pnext = next->pnext;
				next->pnext = cur;
				pstd m = cur;
				cur = next;
				next = m;
			}
		}
		end = cur;
	}
}
void outone(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
	}
	else
	{
		pstd pr = p;
		color(3);
		printf("姓名：%s ", pr->name);
		printf("学号：%s ", pr->id);
		printf("专业：%s ", pr->major);
		printf("性别：%s ", pr->sex);
		color(6);
		printf("\n");
		printf("语文：%5.2f ", pr->s[0]);
		printf("数学：%5.2f ", pr->s[1]);
		printf("英语：%5.2f ", pr->s[2]);
		printf("物理：%5.2f ", pr->s[3]);
		printf("化学：%5.2f ", pr->s[4]);
		printf("生物：%5.2f ", pr->s[5]);
		printf("\n");
		color(5);
		printf("总分：%5.2f", pr->t);
		printf("平均：%5.2f", pr->a);
		color(7);
		printf("\n");
	}
}
pstd fundname(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return NULL;
	}
	int f = 0;
	int l = 0;
	char n[10];
	printf("请输入您要查找的名字：\n");
	scanf("%s", n);
	pstd pr = p->pnext;
	while (pr != NULL)
	{
		if (strcmp(pr->name, n) == 0)
		{
			f++;
			return pr;
		}
		pr = pr->pnext;
	}
	if (f == 0)
		printf("对不起查无此人\n");
	return NULL;
}
pstd fundid(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return NULL;
	}
	int f = 0;
	int l = 0;
	char i[7];
	printf("请输入您要查找的学号：\n");
	scanf("%s", i);
	pstd pr = p->pnext;
	while (pr != NULL)
	{
		if (strcmp(pr->id, i) == 0)
		{
			f++;
			return pr;
		}
		pr = pr->pnext;
	}
	if (f == 0)
		printf("对不起，查无此人\n");
	return NULL;
}
void showmajor(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	int f = 0;
	int l = 0;
	char m[20];
	printf("请输入您要查找的专业：\n");
	scanf("%s", m);
	pstd pr = p->pnext;
	while (pr != NULL)
	{
		if (strcmp(pr->major, m) == 0)
		{
			f++;
			outone(pr);
		}
		pr = pr->pnext;
	}
	if (f == 0)
		printf("对不起查无此人\n");
	return;
}
void deletes(pstd p, pstd ps)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pr = p;
	while (pr->pnext != ps)
	{
		pr = pr->pnext;
	}
	pstd pt = pr->pnext;
	pr->pnext = ps->pnext;
	free(pt);
	pt = NULL;
}
void adds(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd ph = p->pnext;
	while (ph->pnext != NULL)
	{
		ph = ph->pnext;
	}
	int n;
	int i;
	float x;
	char a[10];
	char b[7];
	char m[20];
	printf("请输入添加学生个数：\n");
	scanf_s("%d", &n);
	pstd pt = ph;//尾指针
	pt->pnext = NULL;//尾指针为空
	for (i = 1; i <= n; i++)
	{

		//数据输入
		printf("请输入第%d个添加学生的名字：\n", i);
		scanf("%s", a);
		printf("请输入第%d个添加学生的学号（6位）：\n", i);
		scanf("%s", b);
		if (haveid(p, b) == 0) {
			printf("已存在该学生！\n");
			system("pause");
			return;
		}
		pstd pn = (pstd)malloc(sizeof(std));//开辟空间
		strcpy(pn->id, b);
		strcpy(pn->name, a);
		printf("请输入第%d个学生专业：\n", i);
		scanf("%s", m); strcpy(pn->major, m);
		printf("请输入第%d个学生的性别：\n", i);
		scanf("%s", b); strcpy(pn->sex, b);
		printf("请输入第%d个添加学生的语文成绩：\n", i);
		scanf("%f", &x); pn->s[0] = x;
		printf("请输入第%d个添加学生的数学成绩：\n", i);
		scanf("%f", &x); pn->s[1] = x;
		printf("请输入第%d个添加学生的英语成绩：\n", i);
		scanf("%f", &x); pn->s[2] = x;
		printf("请输入第%d个添加学生的物理成绩：\n", i);
		scanf("%f", &x); pn->s[3] = x;
		printf("请输入第%d个添加学生的化学成绩：\n", i);
		scanf("%f", &x); pn->s[4] = x;
		printf("请输入第%d个添加学生的生物成绩：\n", i);
		scanf("%f", &x); pn->s[5] = x;
		pn->t = pn->s[0] + pn->s[1] + pn->s[2] + pn->s[3] + pn->s[4] + pn->s[5];
		pn->a = pn->t / 6.0;
		pt->pnext = pn;//上次循环之前的尾指针指向新创建的节点
		pn->pnext = NULL;//新节点的指针域为空
		pt = pn;//新节点为尾节点
		system("cls");
	}

}
void precent(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pr = p->pnext;
	int a = 0, b = 0, c = 0, d = 0, e = 0;
	float t;
	while (pr)
	{
		if (pr->s[0] >= 90)
			a++;
		else if (pr->s[0] >= 80 && pr->s[0] < 90)
			b++;
		else if (pr->s[0] >= 70 && pr->s[0] < 80)
			c++;
		else if (pr->s[0] >= 60 && pr->s[0] < 70)
			d++;
		else
			e++; pr = pr->pnext;
	}
	t = a + b + c + d + e;
	printf("语文：\n优秀：%d人 %.2f%% 良好：%d人 %.2f%% 中等：%d人 %.2f%% 及格：%d人 %.2f%% 不及格：%d人 %.2f%% \n", a, a * 100.0 / t, b, b * 100.0 / t, c, c * 100.0 / t, d, d * 100.0 / t, e, e * 100.0 / t);
	a = 0; b = 0; c = 0; d = 0; e = 0;
	pr = p->pnext;
	while (pr)
	{
		if (pr->s[1] >= 90)
			a++;
		else if (pr->s[1] >= 80 && pr->s[1] < 90)
			b++;
		else if (pr->s[1] >= 70 && pr->s[1] < 80)
			c++;
		else if (pr->s[1] >= 60 && pr->s[1] < 70)
			d++;
		else
			e++; pr = pr->pnext;
	}
	t = a + b + c + d + e;
	printf("数学：\n优秀：%d人 %.2f%% 良好：%d人 %.2f%% 中等：%d人 %.2f%% 及格：%d人 %.2f%% 不及格：%d人 %.2f%% \n", a, a * 100.0 / t, b, b * 100.0 / t, c, c * 100.0 / t, d, d * 100.0 / t, e, e * 100.0 / t);
	a = 0; b = 0; c = 0; d = 0; e = 0;
	pr = p->pnext;
	while (pr)
	{
		if (pr->s[2] >= 90)
			a++;
		else if (pr->s[2] >= 80 && pr->s[2] < 90)
			b++;
		else if (pr->s[2] >= 70 && pr->s[2] < 80)
			c++;
		else if (pr->s[2] >= 60 && pr->s[2] < 70)
			d++;
		else
			e++; pr = pr->pnext;
	}
	t = a + b + c + d + e;
	printf("英语：\n优秀：%d人 %.2f%% 良好：%d人 %.2f%% 中等：%d人 %.2f%% 及格：%d人 %.2f%% 不及格：%d人 %.2f%% \n", a, a * 100.0 / t, b, b * 100.0 / t, c, c * 100.0 / t, d, d * 100.0 / t, e, e * 100.0 / t);
	a = 0; b = 0; c = 0; d = 0; e = 0;
	pr = p->pnext;
	while (pr)
	{
		if (pr->s[3] >= 90)
			a++;
		else if (pr->s[3] >= 80 && pr->s[3] < 90)
			b++;
		else if (pr->s[3] >= 70 && pr->s[3] < 80)
			c++;
		else if (pr->s[3] >= 60 && pr->s[3] < 70)
			d++;
		else
			e++; pr = pr->pnext;
	}
	t = a + b + c + d + e;
	printf("物理：\n优秀：%d人 %.2f%% 良好：%d人 %.2f%% 中等：%d人 %.2f%% 及格：%d人 %.2f%% 不及格：%d人 %.2f%% \n", a, a * 100.0 / t, b, b * 100.0 / t, c, c * 100.0 / t, d, d * 100.0 / t, e, e * 100.0 / t);
	a = 0; b = 0; c = 0; d = 0; e = 0;
	pr = p->pnext;
	while (pr)
	{
		if (pr->s[4] >= 90)
			a++;
		else if (pr->s[4] >= 80 && pr->s[4] < 90)
			b++;
		else if (pr->s[4] >= 70 && pr->s[4] < 80)
			c++;
		else if (pr->s[4] >= 60 && pr->s[4] < 70)
			d++;
		else
			e++;
		pr = pr->pnext;
	}
	t = a + b + c + d + e;
	printf("化学：\n优秀：%d人 %.2f%% 良好：%d人 %.2f%% 中等：%d人 %.2f%% 及格：%d人 %.2f%% 不及格：%d人 %.2f%% \n", a, a * 100.0 / t, b, b * 100.0 / t, c, c * 100.0 / t, d, d * 100.0 / t, e, e * 100.0 / t);
	a = 0; b = 0; c = 0; d = 0; e = 0;
	pr = p->pnext;
	while (pr)
	{
		if (pr->s[5] >= 90)
			a++;
		else if (pr->s[5] >= 80 && pr->s[5] < 90)
			b++;
		else if (pr->s[5] >= 70 && pr->s[5] < 80)
			c++;
		else if (pr->s[5] >= 60 && pr->s[5] < 70)
			d++;
		else
			e++; pr = pr->pnext;
	}
	t = a + b + c + d + e;
	printf("生物：\n优秀：%d人 %.2f%% 良好：%d人 %.2f%% 中等：%d人 %.2f%% 及格：%d人 %.2f%% 不及格：%d人 %.2f%% \n", a, a * 100.0 / t, b, b * 100.0 / t, c, c * 100.0 / t, d, d * 100.0 / t, e, e * 100.0 / t);
	printf("\n\n\n");

}
void save(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pr = p->pnext;
	if (pr == NULL)
		return;
	FILE* fp;
	if ((fp = fopen("xdzn.xls", "wt")) == NULL)
	{
		printf("储存失败\n");
		return;
	}
	while (pr)
	{
		fprintf(fp, "%s\t%s\t%s\t%s\t%f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\n",
			pr->name, pr->id, pr->sex, pr->major, pr->s[0], pr->s[1], pr->s[2], pr->s[3], pr->s[4], pr->s[5], pr->t, pr->a);
		pr = pr->pnext;
	}
	fclose(fp);
	fp = NULL;
}
pstd read()
{
	int end;
	pstd ph = (pstd)malloc(sizeof(std));
	pstd pt = ph;
	pt->pnext = NULL;
	FILE* fp;
	if ((fp = fopen("xdzn.xls", "r+")) == NULL)
	{
		printf("读取失败\n");
		return NULL;
	}

	while (1)
	{
	
		pstd pn = (pstd)malloc(sizeof(std));
		end = fscanf(fp, "%s\t%s\t%s\t%s\t%f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\n", &pn->name, &pn->id, &pn->sex, &pn->major, &pn->s[0], &pn->s[1], &pn->s[2], &pn->s[3], &pn->s[4], &pn->s[5], &pn->t, &pn->a);
		if (end == EOF)
		{
			free(pn);
			pn = NULL;
			return ph;
		}
		pt->pnext = pn;
		pn->pnext = NULL;
		pt = pn;
	}
	free(fp);
	fp = NULL;
	printf("读取成功\n");
	return ph;

}
pstd change(pstd p)
{
	if (p == NULL)
		return p;
	pstd pn = p;
	float x;
	char sb[6];
	char m[20];
	printf("请输入待修改学生专业：\n");
	scanf("%s", m); strcpy(pn->major, m);
	printf("请输入待修改学生的性别：\n");
	scanf("%s", sb); strcpy(pn->sex, sb);
	printf("请输入待修改学生的语文成绩：\n");
	scanf("%f", &x); pn->s[0] = x;
	printf("请输入待修改学生的数学成绩：\n");
	scanf("%f", &x); pn->s[1] = x;
	printf("请输入待修改学生的英语成绩：\n");
	scanf("%f", &x); pn->s[2] = x;
	printf("请输入待修改学生的物理成绩：\n");
	scanf("%f", &x); pn->s[3] = x;
	printf("请输入待修改学生的化学成绩：\n");
	scanf("%f", &x); pn->s[4] = x;
	printf("请输入待修改学生的生物成绩：\n");
	scanf("%f", &x); pn->s[5] = x;
	pn->t = pn->s[0] + pn->s[1] + pn->s[2] + pn->s[3] + pn->s[4] + pn->s[5];
	pn->a = pn->t / 6.0;
	return p;
}
void pai(pstd p, pstd pr)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	if (pr == NULL)
	{
		return;
	}
	int c = 0;
	sort_s2(p);
	pstd pt = p;
	while (pt != pr)
	{
		pt = pt->pnext;
		c++;
	}
	if (pt->pnext != NULL) {
		printf("排名：%d\n", c);
		outone(pr);
		return;
	}
}
void outtotal(pstd p)
{
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	float n = 0;
	float c = 0;
	pstd pr = p->pnext;//
	while (pr)
	{
		n += pr->s[0];
		c++;
		pr = pr->pnext;
	}
	printf("语文总分为%5.2f  平均分为%5.2f\n", n, n / c);

	pr = p->pnext;
	n = 0; c = 0;
	while (pr)
	{
		n += pr->s[1];
		c++;
		pr = pr->pnext;
	}
	printf("数学总分为%5.2f  平均分为%5.2f\n", n, n / c);
	
	pr = p->pnext;
	n = 0; c = 0;
	while (pr)
	{
		n += pr->s[2];
		c++;
		pr = pr->pnext;
	}
	printf("英语总分为%5.2f  平均分为%5.2f\n", n, n / c);
	
	pr = p->pnext;
	n = 0; c = 0;
	while (pr)
	{
		n += pr->s[3];
		c++;
		pr = pr->pnext;
	}
	printf("物理总分为%5.2f  平均分为%5.2f\n", n, n / c);
	pr = p->pnext;
	n = 0; c = 0;
	while (pr)
	{
		n += pr->s[4];
		c++;
		pr = pr->pnext;
	}
	printf("化学总分为%5.2f  平均分为%5.2f\n", n, n / c);
	
	pr = p->pnext;
	n = 0; c = 0;
	while (pr)
	{
		n += pr->s[5];
		c++;
		pr = pr->pnext;
	}
	printf("生物总分为%5.2f  平均分为%5.2f\n", n, n / c);

}
int haveid(pstd p, char* id)
{
	pstd pt = p;
	while (pt->pnext != NULL)
	{
		if (strcmp(id, pt->id) == 0)
		{
			return 0;
		}
		pt = pt->pnext;
	}
	return 1;
}
void getmark(pstd p)
{
	int i=1;
	if (p == NULL)
	{
		printf("无学生数据\n");
		return;
	}
	pstd pr = p->pnext;
	if (pr == NULL)
		return;
	FILE* fp;
	if ((fp = fopen("成绩单.xls", "wt")) == NULL)
	{
		printf("打印失败\n");
		system("pause");
		return;
	}
	fprintf(fp, "排名\t姓名\t学号\t性别\t专业\t语文\t数学\t英语\t物理\t化学\t生物\t总分\t平均分\n");
	while (pr)
	{
		fprintf(fp, "第%d名\t%s\t%s\t%s\t%s\t%f\t%f\t%f\t%f\t%f\t%f\t%f\t%f\n",i,pr->name, pr->id, pr->sex, pr->major, pr->s[0], pr->s[1], pr->s[2], pr->s[3], pr->s[4], pr->s[5], pr->t, pr->a);
		pr = pr->pnext;
		i++;
	}
	fclose(fp);
	fp = NULL;
	printf("打印成功！\n");
	system("pause");
}

log.c

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include "log.h"
#include<stdlib.h>
//这里使用的是将密码存储在全局变量中，别问，问就是懒
idkey mg[100];//管理员密码
idkey ss[100];//学生密码
int markmg[100] = {0};
int marks[100] = {0};

void log()
{
	head();
	printf("\n\n\n");
	printf("\t\t用户登录，请输入账号，密码,......\n");
}
//管理员密码操作
void addmgid()//注册
{
	char id[20]; char key[20];
	printf("请输入账号:\n");
	scanf("%s",id);
	printf("请输入密码:\n");
	scanf("%s", key);
	if (strlen(id) <= 1) {
		printf("格式错误！\n");
		system("pause");
		return;
	}
	for (int i = 0; i < 100; i++){
		if (strcmp(mg[i].id, id) == 0)
		{
			printf("此账号已被注册！\n");
			system("pause");
			return;
		}
		else if (markmg[i] == 0) 
		{
			strcpy(mg[i].id, id);
			strcpy(mg[i].key, key);
			markmg[i] = 1;
			FILE* fp;
			if ((fp = fopen("mgid", "a")) == NULL)
			{
				return;
			}
			fprintf(fp, "%s %s\n", id, key);
			printf("管理员注册成功\n");
			system("pause");
			fclose(fp);
			return;
		}
	}
}
void readmgid()//读取
{
	FILE* fp;
	int x;
	if ((fp = fopen("mgid", "r+")) == NULL)
		return;
	int end;
	for (int i = 0; i < 100; i++){
		if (markmg[i] != 1){
			end = fscanf(fp, "%s %s\n", &mg[i].id, &mg[i].key);
			markmg[i] = 1;
			if (end == EOF)
			{
				fclose(fp);
				return;
			}
		}
	}
	return;
}
int ismgid(char id[], char key[])//验证
{
	if (strlen(id) <= 1){
		printf("格式错误！\n");
		return 0;
	}
	for (int i = 0; markmg[i] == 1; i++){
		if (strcmp(id, mg[i].id) == 0 && strcmp(key, mg[i].key) == 0){
			return 1;
		}
	}
	return 0;
}

void addstuid()
{
	char id[20]; char key[20];
	printf("请输入账号:\n");
	scanf("%s", id);
	printf("请输入密码:\n");
	scanf("%s", key);
	if (strlen(id) <= 1) {
		printf("格式错误！\n");
		system("pause");
		return;
	}
	for (int i = 0; i < 100; i++)
	{
		if (strcmp(ss[i].id, id) == 0)
		{
			printf("此账号已被注册！\n");
			system("pause");
			return;
		}
		else if (marks[i] == 0)
		{
			strcpy(ss[i].id, id);
			strcpy(ss[i].key, key);
			marks[i] = 1;
			FILE* fp;
			if ((fp = fopen("studentid", "a")) == NULL){
				return;
			}
			fprintf(fp, "%s %s\n", id, key);
			printf("学生账号注册成功\n");
			system("pause");
			fclose(fp);
			return;
		}
	}
}
void readstuid()
{
	FILE* fp;
	int x;
	if ((fp = fopen("studentid", "r+")) == NULL)
		return;
	int end;
	for (int i = 0; i < 100; i++)
	{
		if (marks[i] != 1)
		{
			end = fscanf(fp, "%s %s\n", &ss[i].id, &ss[i].key);
			marks[i] = 1;
			if (end == EOF){
				fclose(fp);
				return;
			}
		}
	}
	return;
}
int isstuid(char id[], char key[])
{
	if (strlen(id) <= 1)
	{
		printf("格式错误！\n");

		return 0;
	}
	for (int i = 0; marks[i] == 1; i++)
	{
		if (strcmp(id, ss[i].id) == 0 && strcmp(key, ss[i].key) == 0)
		{
			return 1;
		}
	}
	return 0;

}

sys.c

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include "tool.h"
#define HEAD_ONE 30
#define HEAD_TWO 28
#define HEAD_THREE 30
#define HEAD_FOUR 30
void welcome()
{
	printf("\n\n\n");
	color(1);
	printf("\t***************************************************************\n\n");
	color(2);
	printf("\t            * 帅哥美女们，欢迎使用信息管理系统 *\n\n");
	color(3);
	printf("\t        *<<<< <swpu程序设计课程组光宗耀组为您服务> >>>>*\n\n");
	color(4);
	printf("\t                *       *           *       *\n");
	color(5);
	printf("\t              *   *   *   *       *   *   *   *            \n");
	color(6);
	printf("\t  *         *   ^   *   ^   *   *   ^   *   ^   *          *\n ");
	color(7);
	printf("\t **        *                 * *                 *         **\n");
	color(8);
	printf("\t**************************************************************\n");
	color(9);
	printf("\t **          *             *     *             *           **\n");
	color(2);
	printf("\t  *           *     ^     *       *     ^     *            *\n");
	color(3);
	printf("\t                *       *           *       *               \n");
	color(4);
	printf("\t                   * *                 * *                    ");
	color(5);
	printf("\t                     \n");
	color(6);
	printf("\t                                         ——————光宗耀组！！！");
	color(7);
	printf("\n\n\n\t");
}
void mains_mg()
{
	

	color(1);
	printf("____________________________________________________________\n"); color(2);
	printf("|1.录入学生信息                                             |\n"); color(3);
	printf("|2.添加学生信息                                             |\n"); color(4);
	printf("|3.查看学生信息                                             |\n"); color(5);
	printf("|4.修改学生信息                                             |\n"); color(6);
	printf("|5.查看分数统计                                             |\n"); color(7);
	printf("|6.查找学生信息                                             |\n"); color(8);
	printf("|7.存储学生信息                                             |\n"); color(9);
	printf("|8.读取学生信息                                             |\n"); color(8);
	printf("|9.删除学生信息                                             |\n"); color(6);
	printf("|10.打印学生成绩                                            |\n"); color(5);
	printf("|0.退出学生系统                                             |\n"); color(4);
	printf("|___________________________________________________________|\n");
	color(4);
	printf("请输入您的选择:\n");
	color(7);

}
void head()
{
	color(8);
	printf("	            _____          			\n");
	printf("  	  	 \\\\/,---<   欢迎使用！！！！！			\n");
	printf("                  ( )@ @(      _ 			\n");
	printf("		    C __>/    |/ )			\n");
	printf("		     \\\\//     |_/			\n");
	color(5);
	printf("		   ,- >o<-.__/ /			\n");
	printf("		  /   \\/  ____/			\n");
	printf("		 / /|  | |					\n");
	printf("		/ \'--/_| |					\n");
	printf("		`----\\_) |					\n");
	printf("		    |____|					\n");
	color(1);
	printf("		    |  | |					\n");
	printf("		    |  | |					\n");
	printf("		    |  | |					\n");
	printf("		    |__|_|					\n");
	printf("		    (____)_)				\n");
	printf("\n\n\n\n\n\n\n");

	color(4);
	printf("              <<--__请登录__-->>\n");
	color(7);

}
void check_mains()
{
	

	color(1);
	printf(" |____________________________________ \n");
	color(2);
	printf(" |1.按照姓名查看                      |\n");
	color(3);
	printf(" |2.按照学号查看                      |\n");
	color(4);
	printf(" |3.按照专业查看                      |\n");
	color(5);
	printf(" |4.按照成绩顺序查看                  |\n");
	color(6);
	printf(" |5.按照成绩逆序查看                  |\n");
	printf(" |0.退出查看                          |\n");
	color(7);
	printf(" |____________________________________|\n");
	color(8);
	printf("请输入您的选择:\n");
	color(7);

}
void fund_mains()
{
	

	color(1);
	printf("|_______________________ \n");
	color(2);
	printf("|1.通过姓名查找         |\n");
	color(3);
	printf("|2.通过学号查找         |\n");
	color(4);
	printf("|_______________________|\n");
	color(7);
	printf("请输入您的查找方式：\n");

}
void mains_stu()
{
	color(1);
	printf("____________________________________________________________\n");
	color(2);
	printf("|1.查看学生信息                                             |\n");
	color(3);
	printf("|2.查找学生信息                                             |\n");
	color(4);
	printf("|3.打印学生成绩                                             |\n");
	color(5);
	printf("|0.退出学生系统                                             |\n");
	color(6);
	printf("|___________________________________________________________|\n");
	color(7);
	printf("请输入您的选择:\n");
}
void addidhead()
{
	color(1);
	printf("|_______________________ \n");
	color(2);
	printf("|1.注册学生账号         |\n");
	color(3);
	printf("|2.注册教师账号         |\n");
	color(4);
	printf("|_______________________|\n");
	color(7);
}
void logtimehead()
{
	color(1);
	printf("|_______________________ \n");
	color(2);
	printf("|1.登录用户账号         |\n");
	color(3);
	printf("|2.注册用户账号         |\n");
	color(4);
	printf("|_______________________|\n");
	color(7);
}

头文件

stdbill.h

#pragma once
//通用提示信息
void sowhmess();
//排序
void sort();
//查看
void query();
//删除
void deletestu();
//分类查询
void querystu();
//更新
void updute();
//登录验证
int is_user(char* usera, char* userp);
void querystd();

tool.h

#pragma once
void gotoxy(int x, int y);//光标定位 
//颜色
void color(char x);

stuact.h

#pragma once
#include"student.h"
//管理员功能
pstd main_mg(int x, pstd heads);
//学生权限
pstd main_stu(int x, pstd heads);
//密码验证
int login();
//登录/注册实现
int logtime(int x);
//注册实现
void addid();

student.h

#pragma once
typedef struct std
{
	char name[10];//姓名
	char id[7];//学号
	char sex[6];//性别
	char major[20];//专业
	float s[6];//各科分数
	float t;//总分
	float a;//平均
	struct std* pnext;
}std, * pstd;
//创建
pstd input();
//输出所有学生信息
void out(pstd p);
//总分低到高排序
void sort_s1(pstd p);
//总分高到低排序
void sort_s2(pstd p);
//姓名排序
void sort_byname(pstd p);
//学号排序
void sort_byid(pstd p);
//输出单个学生信息
void outone(pstd p);
//姓名查找
pstd fundname(pstd p);
//学号查找
pstd fundid(pstd p);
//专业查找
void showmajor(pstd p);
//删除学生
void deletes(pstd p, pstd ps);
//成绩分析
void precent(pstd p);
//文件储存
void save(pstd p);
//文件读取
pstd read();
//学生添加
void adds(pstd p);
//排名
void pai(pstd p, pstd pr);
//计算总分与平均分
void outtotal(pstd p);
//修改学生信息
void change(pstd p);
//学生学号验证
int haveid(pstd p,char* id);
//打印成绩单
void getmark(pstd p);

log.h

#pragma once
typedef struct idkey
{
	char id[20];
	char key[20];
}idkey;
//因为是多文件所以说要对全局变量使用extern修饰
extern idkey mg[100];//管理员密码
extern idkey ss[100];//学生密码
extern int markmg[100];
extern int marks[100];
void log();
//注册管理员账号
void addmgid();
//读取管理员账号
void readmgid();
//验证管理员账号
int ismgid(char id[], char key[]);
//注册学生账号
void addstuid();
//读取学生账号
void readstuid();
//验证学生账号
int isstuid(char id[], char key[]);

sys.h

#pragma once
//欢迎界面
void welcome();
//管理员界面
void mains_mg();
//登录界面
void head();
//学生界面
void mains_stu();
//查看选项
void check_mains();
//查找选项
void fund_mains();
//注册界面
void addidhead();
//登录/注册界面
void logtimehead();

main.c

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include"sys.h"
#include"stuact.h"
#include"stdbill.h"
#include"log.h"
#include"tool.h"
#include"student.h"

int main() {

	readstuid();
	readmgid();
	int lc = 0;
	pstd heads = NULL;
	welcome();
	system("pause");
	while (lc < 3){
		system("cls");
		int logs;
		logtimehead();
		scanf("%d", &logs);
		int l = logtime(logs);
		if (l == 1){
			int num;
			system("cls");
			printf("\t\t欢迎进入系统，请稍等......\n");
			Sleep(1000);
			do{
				mains_mg();
				scanf("%d", &num);
				heads=main_mg(num, heads);
			} while (1);
		}else if (l == 2){
			heads = read();
			int num;
			system("cls");
			printf("\t\t欢迎进入系统，请稍等......\n");
			Sleep(1000);
			do {
				mains_stu();
				scanf("%d", &num);
				main_stu(num, heads);
			} while (1);
		}else if (l == -1){
			printf(".....\n");
		}else {
			fflush(stdin);
			printf("\n\t\t用户和密码输入错误，按任意键重新输入\n");
			Sleep(100);
			system("pause");
			lc++;
		}
	}
	if (lc == 3){
		printf("\n\t\t连续错误三次，程序即将退出。。。。");
		Sleep(2000);
		exit(-1);
	}
	return 0;
}

最后 最后

一定要写好文档！！！！！！！！！！！！！！！！！！！！！！！！！！！