博客

（创作不易，感谢有你，你的支持，就是我前行的最大动力，如果看完对你有帮助，请留下您的足迹）

今天我们来试着用链表创建一个学生成绩管理系统

其中主要包含的知识点为单链表(

http://t.csdn.cn/gsAdH

)和C语言文件操作(

http://t.csdn.cn/j3kwe

) 相关知识点的链接我已经给出

总体代码就是这样，如果大家发现bug或者有更好的方法 ，欢迎大家一起来讨论呀，一起加油

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<string.h>
//学生信息
typedef struct student
{
	char stuNum[20];
	char name[20];
	int score;
}Student;
//节点信息
typedef struct node
{
	Student student;
	struct node* next;
}node;
void welcome()
{
	printf("****  链式学生管理系统  *******\n");
	printf("*******************************\n");
	printf("****0.退出功能 1.录入功能******\n");
	printf("****2.打印功能 3.统计功能******\n");
	printf("****4.查找功能 5.修改功能******\n");
	printf("****6.删除功能 7.排序功能******\n");
	printf("*******************************\n");
}
//保存学生信息
void savestudent(node* head)
{
	//打开文件
	FILE* file = fopen("C:\\Users\\周星辰\\Desktop\\学生成绩管理系统.txt", "w");
	if (file == NULL)
	{
		printf("打开文件失败\n");
		return;
	}
	node* move = head->next;
	while (move != NULL)
	{
		//写入文件
		if (fwrite(&move->student, sizeof(student), 1, file) != 1)
		{
			printf("保存%s出现错误\n", move->student.name);
			return;
		}
		move = move->next;
	}
	//关闭文件
	fclose(file);
}
//录入学生信息
void inputstudent(node*head)
{
	node* fresh = (node*)malloc(sizeof(node));
	fresh->next = NULL;
	printf("请输入学生学号\n");
	scanf("%s", fresh->student.stuNum);
	printf("请输入学生姓名\n");
	scanf("%s", fresh->student.name);
	printf("请输入学生成绩\n");
	scanf("%d", &fresh->student.score);
	node* move = head;
	while (move->next != NULL)
	{
		move = move->next;
	}
	//将学生插入到尾部
	move->next = fresh;
	savestudent(head);
	system("cls");//清屏
	printf("学生信息录入成功\n");
	system("pause");//暂停程序
	system("cls");//清屏
}
//打印学生信息
void printStudent(node* head)
{
	node* move = head->next;
	printf("%10s\t%10s\t%10s\n","学号","姓名","成绩");
	while (move != NULL)
	{
		/*printf("学号:%s 姓名：%s 成绩：%d\n",
			move->student.stuNum,
			move->student.name,
			move->student.score);*/
		printf("%10s\t%10s\t%10d\n",
			move->student.stuNum,
			move->student.name,
			move->student.score);
		move = move->next;
	}
	system("pause");//暂停程序
	system("cls");//清屏
}
//统计总人数
void countstudent(node* head)
{
	node* move = head->next;
	int count = 0;
	while (move != NULL)
	{
		count++;
		move = move->next;
	}
	printf("学生总人数为：%d\n", count);
	system("pause");//暂停程序
	system("cls");//清屏
}
//查找学生信息
void findstudent(node* head)
{
	printf("请输入学生的学号：\n");
	char a[20];
	scanf("%s", a);
	node* move = head->next;
	while (move != NULL)
	{
		if (strcmp(move->student.stuNum, a) == 0)
		{
			printf("%10s\t%10s\t%10s\n", "学号", "姓名", "成绩");
			printf("%10s\t%10s\t%10d\n",
				move->student.stuNum,
				move->student.name,
				move->student.score);
			system("pause");//暂停程序
			system("cls");//清屏
			return;
		}
		move = move->next;
	}
	printf("未找到学生信息\n");
	system("pause");//暂停程序
	system("cls");//清屏
}
//读取学生信息
void loadstudent(node* head)
{
	//打开文件
	FILE* file = fopen("C:\\Users\\周星辰\\Desktop\\学生成绩管理系统.txt", "r");
	if (!file)
	{
		printf("未找到学生文件\n");
		return;
	}
	//创建一个节点
	node* fresh = (node*)malloc(sizeof(node));
	fresh->next = NULL;
	node* move = head;
	while (fread(&fresh->student, sizeof(student), 1, file) == 1)
	{
		move->next = fresh;
		move = fresh;
		fresh = (node*)malloc(sizeof(node));
		fresh->next = NULL;
	}
	//最后多定义一个fresh，要将它释放掉
	free(fresh);
	//关闭文件
	fclose(file);
}
//修改学生信息
void modifystudent(node* head)
{
	printf("请输入要修改的学生的学号：");
	char a[20];
	scanf("%s", &a);
	node* move = head->next;
	while (move != NULL)
	{
		if (strcmp(move->student.stuNum, a) == 0)
		{
			printf("请输入学生学号\n");
			scanf("%s", move->student.stuNum);
			printf("请输入学生姓名\n");
			scanf("%s", move->student.name);
			printf("请输入学生成绩\n");
			scanf("%d", &move->student.score);
			savestudent(head);
			printf("修改成功\n");
			system("pause");//暂停程序
			system("cls");//清屏
			return;
		}
		move = move->next;
	}
	printf("未找到学生信息\n");
	system("pause");//暂停程序
	system("cls");//清屏
}
//删除学生信息
void deletestudent(node* head)
{
	printf("输入要删除学生学号：\n");
	char a[20];
	scanf("%s", &a);
	node* move = head;
	while (move->next != NULL)
	{
		if (strcmp(move->next->student.stuNum, a) == 0)
		{
			node* tmp = move->next;
			move->next = move->next->next;
			free(tmp);
			tmp = NULL;
			savestudent(head);
			printf("删除成功\n");
			system("pause");//暂停程序
			system("cls");//清屏
			return;
		}
		move = move->next;
	}
	printf("未找到学生信息\n");
	system("pause");//暂停程序
	system("cls");//清屏
}
//排序
void sortstudent(node* head)
{
	for (node* turn = head->next; turn->next != NULL; turn = turn->next)
	{
		for (node* move = head->next; move->next != NULL; move = move->next)
		{
			if (move->student.score < move->next->student.score)
			{
				student temp = move->student;
				move->student = move->next->student;
				move->next->student = temp;
			}
		}
	}
	printStudent(head);
}
int main()
{
	//创建头节点
	node* head = (node*)malloc(sizeof(node));
	head->next = NULL;
	loadstudent(head);
	while (1)
	{
		welcome();
		char c = _getch();
		switch (c)
		{
		case '1':
			inputstudent(head);
			break;
		case '2':
			printStudent(head);
			break;
		case '3':
			countstudent(head);
			break;
		case '4':
			findstudent(head);
			break;
		case '5':
			modifystudent(head);
			break;
		case '6':
			deletestudent(head);
			break;
		case '7':
			sortstudent(head);
			break;
		case '0':
			printf("退出程序\n");
			exit(0);
			break;
		default:
			printf("输入错误\n");
			break;
		}
	}
	return 0;
}