两个小时写的教务管理系统

YFSafe

翻到了之前写的一个项目,于是想再实现一个。

用二十分钟写了一个大概的模版,结果改bug用了很久

[C++] 纯文本查看 复制代码

#include <iostream>
#include <bits/stdc++.h>
using namespace std;

struct Student
{
	int id;//学号
	string name;
	int score;
}Stu[1005];
int cnt = 0;//总数
void printstu();//ok
void insertstu();//ok
void deletestu();//ok
void changestu();
int searchstu(int myid);//ok

int searchstu(int myid)//搜索到则返回数值在数组中的位置,未搜到返回-1
{
	for(int i = 1;i <= cnt;i++)
	{
		if(Stu[i].id == myid) 
		{
		    cout << i << endl;
		    return i;
		}
	}
	return -1;
}

void printstu()
{
	cout << "以下是现有的学生" << endl;
	for(int i = 1;i <= cnt;i++)
	{
	    if(Stu[i].id == -1) continue;
		cout << "学号:" << Stu[i].id << " 姓名:" << Stu[i].name << " 分数:" << Stu[i].score << endl;
	}
}

void insertstu()
{
	int insert = 0;
	if(cnt + 1 >= 1005) 
	{
		cout << "空间不足!请删除一些学生再添加" << endl;
		return;
	}
	for(int i = 1;i <= cnt;i++)//这里先不count++的原因是stu[count++]这个内存未被使用,如果访问会错误
    {
		if(Stu[i].id == -1) 
		{
			insert = i;
			break;
		}
	}
	if(insert == 0) insert = ++cnt;
	string stuname;
	int stuid,stuscore;
	cout << "名称:";
    cin >> stuname;
	Stu[insert].name = stuname;
	cout << "学号:";
	cin >> stuid;
	if(searchstu(stuid) != -1)
	{
	    cout << "学号重复!!!" << endl;
	    return;
	}
	Stu[insert].id = stuid;
    cout << "成绩:";
    cin >> stuscore;
	Stu[insert].score = stuscore;
}

void deletestu()
{
	cout << "请输入删除学生的学号" << endl;
	int myid;
	cin >> myid;
	int res = searchstu(myid);
	if(res) Stu[res].id = -1;
	else cout << "学号错误!" << endl;
}
        
void changestu()
{
	cout << "请输入学生的学号" << endl;
	int myid;
	cin >> myid;
	int res = searchstu(myid);
	if(res != -1)
	{
		cout << "请输入成绩:";
		int myscore;
		cin >> myscore;
		Stu[res].score = myscore;
		cout << "修改成功!" << endl;
	}
	else cout << "学号错误!" << endl;
}

int main()
{
	char select;
	while(true)
	{
		cout<<"============\n";
       		cout<<"1.插入学生数据\n";
       		cout<<"2.删除学生信息\n";
       		cout<<"3.打印学生信息\n";
       		cout<<"4.修改学生数据\n";
       		cout<<"q.退出\n";
		cin >> select;
		if(select == '1') insertstu();
		else if(select == '2') deletestu();
		else if(select == '3') printstu();
		else if(select == '4') changestu();
		else if(select == 'q') return 0;
		else cout << "不支持的操作!" << endl;
	}
	return 0;
}