C语言：分享一下自己写的简单的学生管理系统。

深藏阁楼爱情的钟 2023-10-02 18:09 4阅读 0赞

>     #include<stdio.h>
>     #include<stdlib.h>
>     #include<string.h>
>     struct student
>     {
>     	int num;
>     	char name[20];
>     	char sex[10];
>     	int year;
>     	float score;
>     	struct student* next;
>     };
>     int n;
>     struct student* h;
>     int main()
>     {
>     	void log();//登录函数
>     	void record();//目录
>     	struct student* creat();//输入函数
>     	void print(struct student* head); //输出函数
>     	void dels(); //删除全操作
>     	void adds(); //添加全操作 
>     	struct student *refers(struct student *h1);//查询操作 
>     	struct student *change(struct student *hl); //更改操作 
>     
>     	int in1, in2;
>     
>     	log();
>     	while (1)
>     	{
>     		printf("\n请输入你的操作命令：");
>     		do {
>     			scanf("%d", &in1);
>     		} while (in1 != 1 && in1 != 2 && in1 != 3 && in1 != 4 && in1 != 5 && in1 != 6);
>     		if (in1 == 1 || in1 == 2 || in1 == 3 || in1 == 4 || in1 == 5)
>     		{
>     			printf("\n未储存有数据！\n请输入数据！");
>     			break;
>     		}
>     		else {
>     			printf("你已退出！欢迎使用！");
>     			break;
>     		}
>     	}
>     	h = creat();
>     	print(h);
>     A:	{
>     	printf("\n**********************************************************");
>     	printf("\n1、返回界面  2、添加  3、删除  4、更改  5、查询  6、退出");
>     	printf("\n请输入你的操作命令：");
>     	scanf("%d", &in2);
>     	switch (in2)
>     	{
>     	case 1: {log();
>     		break;
>     	}
>     	case 2: {adds();
>     		goto A;
>     		break;
>     	}
>     	case 3: {dels();
>     		goto A;
>     		break;
>     	}
>     	case 4: {change(h);
>     		goto A;
>     		break;
>     	}
>     	case 5: {refers(h);
>     		goto A;
>     		break;
>     	}
>     	case 6: {printf("\n你已退出！欢迎使用！");
>     		break;
>     	}
>     	default:printf("\n输入错误！"); printf("\n你已退出！欢迎使用！"); break;
>     	}
>     }
>     }
>     void log() //登录函数
>     {
>     	int i;
>     	void record();
>     	printf("      学生管理系统 \t");
>     	printf("\n\t1、登录\n\t2、退出\t");
>     
>     	while (1) //循环输入，判断
>     	{
>     		printf("\n\n请输入你要执行的操作：");
>     		do {
>     			scanf("%d", &i);
>     		} while (i != 1 && i != 2);
>     
>     		if (i == 1)
>     		{
>     			record();
>     			break;
>     		}
>     		else
>     		{
>     			printf("\n你已退出，欢迎使用！");
>     			break;
>     		}
>     	}
>     }
>     void record() //显示目录
>     {
>     	printf("\n\t1、显示学生信息");
>     	printf("\n\t2、添加学生信息");
>     	printf("\n\t3、删除学生信息");
>     	printf("\n\t4、更改学生信息");
>     	printf("\n\t5、查询学生信息");
>     	printf("\n\t6、退出学生系统");
>     }
>     struct student* creat() //输入数据 
>     {
>     	struct student* head;
>     	struct student* p1, * p2;
>     	p1 = (struct student*)malloc(sizeof(struct student));
>     	p2 = p1;
>     	printf("\n请输入学生学号、姓名、性别、年龄、成绩 ：");
>     	scanf("%d%s%s%d%f", &p1->num, &p1->name, &p1->sex, &p1->year, &p1->score);
>     	head = NULL;
>     	n = 0;
>     	while (p1->num != 0)
>     	{
>     		n++;
>     		if (n == 1)
>     		{
>     			head = p1;
>     		}
>     		else
>     		{
>     			p2->next = p1;
>     		}
>     		p2 = p1;
>     		p1 = (struct student*)malloc(sizeof(struct student));
>     		printf("请输入学生学号、姓名、性别、年龄、成绩 ：");
>     		scanf("%d%s%s%d%f", &p1->num, &p1->name, &p1->sex, &p1->year, &p1->score);
>     	}
>     	p2->next = NULL;
>     	return head;
>     }
>     void print(struct student* hl) //输出数据 
>     {
>     	struct student* p;
>     	p = hl;
>     	if (hl != NULL)
>     	{
>     		printf("\n\t学号:\t姓名:\t性别:\t年龄:\t成绩:");
>     		do {
>     			printf("\n\t%d\t%s\t%s\t%d\t%.2f", p->num, p->name, p->sex, p->year, p->score);
>     			p = p->next;
>     		} while (p != NULL);
>     	}
>     }
>     void dels() //删除全操作 
>     {
>     	struct student* del(struct student* h, int sum);
>     	void print(struct student* head);
>     
>     	int sum;
>     	int ch;
>     
>     	while (1)
>     	{
>     		printf("\n你是否需要删除数据(Y/N)：");
>     		do
>     		{
>     			ch = getchar();
>     		} while (ch != 'Y' && ch != 'N');
>     
>     		if (ch == 'Y')
>     		{
>     			printf("请输入你要删除的数据：");
>     			scanf("%d", &sum);
>     			h = del(h, sum);
>     			print(h);
>     		}
>     		else
>     		{
>     			break;
>     		}
>     	}
>     
>     	printf("删除完毕！最终数据为：\n");
>     	print(h);
>     
>     }
>     struct student* del(struct student* hl, int sum) //删除关键操作 
>     {
>     	struct student* p1, * p2;
>     	p2 = p1 = hl;
>     
>     	while (p1->num != sum && p1->next != NULL)
>     	{
>     		p2 = p1;
>     		p1 = p1->next;
>     	}
>     	if (p1->num == sum)
>     	{
>     		if (p1 == h)
>     		{
>     			hl = p1->next;
>     		}
>     		else
>     		{
>     			p2->next = p1->next;
>     		}
>     	}
>     	else
>     	{
>     		printf("未找到数据！");
>     	}
>     	return h;
>     }
>     void adds() //添加全操作 
>     {
>     	struct student* add(struct student** h, int num, char name[20], char sex[10], int year, float score);
>     	void print(struct student* h);
>     
>     	int num;
>     	char name[20];
>     	char sex[10];
>     	int year;
>     	float score;
>     	int ch;
>     
>     	while (1)
>     	{
>     		printf("\n你是否需要添加数据：");
>     		do {
>     			ch = getchar();
>     		} while (ch != 'Y' && ch != 'N');
>     
>     		if (ch == 'Y')
>     		{
>     			printf("\n请输入学生学号、姓名、性别、年龄、成绩 ：");
>     			scanf("%d%s%s%d%f", &num, &name, &sex, &year, &score);
>     			h = add(&h, num, name, sex, year, score);
>     		}
>     		else
>     		{
>     			break;
>     		}
>     	}
>     
>     	printf("添加完毕！");
>     	printf("最终数据为：\n");
>     	print(h);
>     
>     }
>     struct student* add(struct student** hl, int num, char name[20], char sex[10], int year, float score) //添加关键操作 
>     {
>     	struct student* p1, * p2, * New;
>     	p1 = *hl;
>     	p2 = NULL;
>     
>     	while (p1 != NULL && p1->num < num)
>     	{
>     		p2 = p1;
>     		p1 = p1->next;
>     	}
>     
>     	New = (struct student*)malloc(sizeof(struct student));
>     
>     	New->num = num;
>     	strcpy(New->name, name);
>     	strcpy(New->sex, sex);
>     	New->year = year;
>     	New->score = score;
>     	New->next = p1;
>     
>     	if (p2 == NULL)
>     	{
>     		*hl = New;
>     	}
>     	else
>     	{
>     		p2->next = New;
>     	}
>     
>     	return *hl;
>     }
>     struct student *refers(struct student *hl) //查询全操作 
>     {
>     	struct student* p1, * p2, * p0;
>     	int num;
>     	int ch;
>     	p0 = NULL;
>     	while (1)
>     	{
>     		p1 = p2 = hl;
>     		printf("\n你是否需要查询(Y/N)：");
>     		do {
>     			ch = getchar();
>     		} while (ch != 'Y' && ch != 'N');
>     		if (ch == 'Y')
>     		{
>     			printf("\n请输入你要查询的学号：");
>     			scanf("%d", &num);
>     			while (p1->num != num && p1->next != NULL)
>     			{
>     				p2 = p1;
>     				p1 = p1->next;
>     			}
>     			if (p1->num == num)
>     			{
>     				p0 = p1;
>     				printf("\n你的查询结果：");
>     				printf("\n\t学号:\t姓名:\t性别:\t年龄:\t成绩:");
>     				printf("\n\t%d\t%s\t%s\t%d\t%.2f", p0->num, p0->name, p0->sex, p0->year, p0->score);
>     			}
>     			else
>     			{
>     				printf("未找到相关数据！");
>     			}
>     		}
>     		else {
>     			printf("\n你已退出查询！");
>     			break;
>     		}
>     	}
>     	return h;
>     }
>     struct student *change(struct student *hl) //更改全操作 
>     {
>     	struct student *xue(struct student *d);
>     	struct student *xing(struct student *d);
>     	struct student *bie(struct student *d);
>     	struct student *nian(struct student *d);
>     	struct student *cheng(struct student *d);
>     	struct student* p1, * p2, * p0;
>     	int num;
>     	int ch;
>     	int chan; 
>     	p0 = NULL;
>     	while (1)
>     	{
>     		p1 = p2 = hl;
>     		printf("\n你是否需要更改(Y/N)：");
>     		do {
>     			ch = getchar();
>     		} while (ch != 'Y' && ch != 'N');
>     		if (ch == 'Y')
>     		{
>     			printf("\n请输入你要更改的学号：");
>     			scanf("%d", &num);
>     			while (p1->num != num && p1->next != NULL)
>     			{
>     				p2 = p1;
>     				p1 = p1->next;
>     			}
>     			if (p1->num == num)
>     			{
>     				p0 = p1;
>     				printf("\n1、学号 2、姓名 3、性别 4、年龄 5、成绩");
>     				printf("\n请输入你的操作：");
>     				scanf("%d",&chan);
>     				switch(chan)
>     				{
>     					case 1:xue(p0);break;
>     					case 2:xing(p0);break;
>     					case 3:bie(p0);break;
>     					case 4:nian(p0);break;
>     					case 5:cheng(p0);break;
>     					default :break;
>     				 } 
>     				 printf("\n你更改后的结果：");
>     				 printf("\n\t学号:\t姓名:\t性别:\t年龄:\t成绩:");
>     				 printf("\n\t%d\t%s\t%s\t%d\t%.2f", p0->num, p0->name, p0->sex, p0->year, p0->score);
>     			}
>     			else
>     			{
>     				printf("未找到相关数据！");
>     			}
>     		}
>     		else {
>     			printf("\n你已退出更改！");
>     			break;
>     		}
>     	}
>     	return h;
>     }
>     struct student *xue(struct student *d) //更改学号 
>     {
>     	struct student *p;
>     	p=d;
>     	printf("\n请输入新的学号：");
>     	scanf("%d",&p->num);
>     	return p;
>     }
>     struct student *xing(struct student *d)//更改姓名 
>     {
>     	struct student *p;
>     	char s[20];
>     	p=d;
>     	printf("\n请输入新的姓名：");
>     	scanf("%s",&s);
>     	strcpy(p->name,s);
>     	return p;
>     }
>     struct student *bie(struct student *d)//更改性别 
>     {
>     	struct student *p;
>     	char s[10];
>     	p=d;
>     	printf("\n请输入新的性别：");
>     	scanf("%s",&s);
>     	strcpy(p->sex,s);
>     	return p;
>     }
>     struct student *nian(struct student *d)//更改年龄 
>     {
>     	struct student *p;
>     	p=d;
>     	printf("\n请输入新的年龄：");
>     	scanf("%d",&p->year);
>     	return p;
>     }
>     struct student *cheng(struct student *d)//更改成绩 
>     {
>     	struct student *p;
>     	p=d;
>     	printf("\n请输入新的成绩：");
>     	scanf("%f",&p->score);
>     	return p;
>     }