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学生管理系统.c文件

#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
#include<string.h>
#define MAX 100

struct student 
{
	char name[20];
	int num;
	double score[3];
	double sum;
};
struct pSysytem
{
	struct student stu[MAX];
	int curSize;
};
struct pSysytem* createsystem()
{
	struct pSysytem* psystem = (struct pSysytem*)calloc(sizeof(struct pSysytem), 1);
	return psystem;
}
void insertArray(struct pSysytem * pSystem,struct student stuinfo)
{
	if (pSystem->curSize == MAX)
	{
		printf("满了！！！！\n");
		return;
	}
	pSystem->stu[pSystem->curSize] = stuinfo;
	pSystem->curSize++;
}
//浏览信息
void printarray(struct pSysytem* pSystem)
{
	printf("姓名\t编号\t数学\t英语\t体育\t总分\n");
	for (int i = 0; i < pSystem->curSize; i++)
	{
		printf("%s\t%d\t",pSystem->stu[i].name,pSystem->stu[i].num);
		for (int k = 0; k < 3; k++)
		{
			printf("%.lf\t",pSystem->stu[i].score[k]);
		}
		printf("%.lf\n", pSystem->stu[i].sum);
	}
}
//录入信息
void intputstudent(struct pSysytem* pSystem)
{
	struct student temp;
	printf("请输入学生的姓名和编号：");
	scanf_s("%s%d", temp.name, 20, &temp.num);
	printf("请输入三门课成绩");
	temp.sum = 0;
	for (int i = 0; i < 3; i++)
	{
		scanf_s("%lf", &temp.score[i]);
		temp.sum += temp.score[i];
	}
	insertArray(pSystem, temp);
}
//查找信息
int searcharray(struct pSysytem* pSystem, const char* name)
{
	for (int i = 0; i < pSystem->curSize; i++)
	{
		if (strcmp(pSystem->stu[i].name,name) == 0)
			return i;
	}
	return -1;
}
//删除信息
void deletarray(struct pSysytem* pSystem, const char* name)
{
	int pos = searcharray(pSystem, name);
	if (pos == -1)
	{
		printf("没找到无法删除\n");
	}
	else
	{
		for (int i = 0; i < pSystem->curSize; i++)
		{
			pSystem->stu[i] = pSystem->stu[i + 1];
		}
		pSystem->curSize--;
		printf("删除成功\n");
	}
}
//修改信息
void modifyarray(struct pSysytem* pSystem, const char* name)
{
	int pos = searcharray(pSystem, name);
	if (pos == -1)
	{
		printf("没找到无法删除\n");
	}
	else
	{
		printf("请输入新学生的姓名和编号：");
		scanf_s("%s%d", pSystem->stu[pos].name, 20, &pSystem->stu[pos].num);
		printf("请输入新的三门课成绩：");
		pSystem->stu[pos].sum = 0;
		for (int i = 0; i < 3; i++)
		{
			scanf_s("%lf", &pSystem->stu[pos].score[i]);
			pSystem->stu[pos].sum += pSystem->stu[pos].score[i];
		}
		printf("修改成功\n");
	}
}
//排序信息
void bubblesort(struct pSysytem* pSystem)
{
	//按照总分排序
	for (int i = 0; i < pSystem->curSize; i++)
	{
		for (int k = 0; k < pSystem->curSize - i - 1; k++)
		{
			if (pSystem->stu[k].sum < pSystem->stu[k + 1].sum)
			{
				struct student temp = pSystem->stu[k];
				pSystem->stu[k].sum = pSystem->stu[k + 1].sum;
				pSystem->stu[k + 1] = temp;
			}
		}
	}
}
//文件写
void saveinfotofile(struct pSysytem* pSystem, const char* filename)
{
	FILE* save = fopen(filename,"w");
	fprintf(save,"姓名\t编号\t数学\t英语\t体育\t总分\n");
	for (int i = 0; i < pSystem->curSize; i++)
	{
		fprintf(save,"%s\t%d\t", pSystem->stu[i].name, pSystem->stu[i].num);
		for (int k = 0; k < 3; k++)
		{
			fprintf(save,"%.lf\t", pSystem->stu[i].score[k]);
		}
		fprintf(save,"%.lf\n", pSystem->stu[i].sum);
	}
	fclose(save);
}
//文件读
void redeinfotofile(struct pSysytem* pSystem, const char* filename)
{
	FILE* read = fopen(filename, "r");
	if (read == NULL)
	{
		read = fopen(filename, "w+");
		return;
	}
	struct student temp;
	pSystem->curSize = 0;
	while (1) 
	{
		if (feof(read))
		{
			break;
		}
			int result = fscanf(read, "%s\t%d\t", pSystem->stu[pSystem->curSize].name, &pSystem->stu[pSystem->curSize].num);
			for (int k = 0; k < 3; k++)
			{
				result = fscanf(read, "%lf\t", &pSystem->stu[pSystem->curSize].score[k]);
			}
			result = fscanf(read, "%lf\n", &pSystem->stu[pSystem->curSize].sum);
			pSystem->curSize++;
	}
	fclose(read);
}
//菜单
void makeMenu()
{
	//打印函数+转义字符
	printf("------------------------------------\n");
	printf("\t\t0.退出系统\n");
	printf("\t\t1.录入信息\n");
	printf("\t\t2.浏览信息\n");
	printf("\t\t3.删除信息\n");
	printf("\t\t4.修改信息\n");
	printf("\t\t5.查找信息\n");
	printf("\t\t6.排序信息\n");
	printf("------------------------------------\n");
}
//按键处理
void keyDown(struct pSysytem* pSystem)
{
	//按键输入+开关语句
	struct student temp;
	int pos = 0;
	int userkey = 0;
	scanf_s("%d", &userkey);
	switch (userkey)
	{
	case 0:
		exit(0);
		break;
	case 1:
		intputstudent(pSystem);
		saveinfotofile(pSystem, "student.txt");
		break;
	case 2:
		printarray(pSystem);
		break;
	case 3:
		printf("请输入删除学生的姓名:");
		scanf_s("%s",temp.name,20);
		deletarray(pSystem, temp.name);
		saveinfotofile(pSystem, "student.txt");
		break;
	case 4:
		printf("请输入修改学生的姓名:");
		scanf_s("%s", temp.name,20);
		modifyarray(pSystem, temp.name);
		saveinfotofile(pSystem, "student.txt");
		break;
	case 5:
		printf("请输入查找学生的姓名:");
		scanf_s("%s", temp.name,20);
		if (pos = searcharray(pSystem, temp.name) == -1)
		{
			printf("未找到相关信息\n");
		}
		else
		{
			printf("姓名\t编号\t数学\t英语\t体育\t总分\n");
			printf("%s\t%d\t", pSystem->stu[pos].name, pSystem->stu[pos].num);
			for (int i = 0; i < pSystem->stu[pos].score[i]; i++)
			{
				printf("%.lf\t", pSystem->stu[pos].score[i]);
			}
		}
		break;
	case 6:
		bubblesort(pSystem);
		printarray(pSystem);
		break;
	default:
		printf("输入错误\n");
		break;
	}

}
int main()
{
	struct pSysytem* psystem = createsystem();
	redeinfotofile(psystem, "student.txt");
	while (true) {
		makeMenu();
		keyDown(psystem);
		system("pause");
		system("cls");
	}
	return 0;
}