本文实例为大家分享了c++实现宿舍管理查询系统的具体代码，供大家参考，具体内容如下
c++使用io流关联.txt文件
各模块之间的调用关系如下：
函数的调用关系反映了演示程序的层次结构：
代码如下：
#include<iostream>
#include<fstream>
#include<iomanip>
#include<cstdlib>
#include<string>
using namespace std;
#define maxsize 100 //顺序表的最大长度
typedef struct {
string name; //姓名
string id; //学号
string dormid; //宿舍号
}student;
typedef struct {
student r[maxsize + 1]; //r[0]做单元哨兵
int length;//长度
}sqlist;
//用直接插入排序存入到student.txt文件中
void insertsort(sqlist &stu)
{
int i, j;
for (i = 2; i <= stu.length; i++)
if (stu.r[i].id < stu.r[i - 1].id)
{
stu.r[0] = stu.r[i];
stu.r[i] = stu.r[i - 1];
for (j = i - 2; stu.r[0].id < stu.r[j].id; j--)
stu.r[j + 1] = stu.r[j];
stu.r[j + 1] = stu.r[0];
}
ofstream outfile("student.txt", ios::out);
if (!outfile) { //如果文件打开失败
cout << "文件打开失败" << endl;
exit(1);
}
//outfile << "学号" << setw(8) << "姓名" << setw(8) << "宿舍号" << endl;
outfile << stu.length << endl;
for (i = 1; i <= stu.length; i++) {
outfile << stu.r[i].id << setw(8) << stu.r[i].name << setw(8) << stu.r[i].dormid << endl;
}
cout << "学生信息数：" << stu.length << endl;
outfile.close();
cout << stu.length;
}
//创建学生信息(只能创建一次,不然会被刷新)
void initlist(sqlist &stu)
{
int i;
cout << "学号" << setw(8) << "姓名" << setw(8) << "宿舍号" << endl;
for (i = 1; i <= stu.length; i++) {
cin >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
insertsort(stu);
}
//增加学生信息
void addstudent(sqlist &stu)
{
int n;
int i = stu.length + 1;
cout << "输入增加学生人数" << endl;
cin >> n;
cout << "学号" << setw(8) << "姓名" << setw(8) << "宿舍号" << endl;
stu.length = stu.length + n;
for (i; i <= stu.length; i++)
cin >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
insertsort(stu);
}
//查询学生信息
void findstudent(sqlist &stu)
{
string a, b, c;
string name, id, dormid;
cout << "1.学号查询 2.姓名查询 3.宿舍号查询" << endl;
cout << "请输入你的查询选择（1~3）" << endl;
int i;
int n;
cin >> n;
if (n < 1 && n>3)
{
cout << "您输入有误，请重新输入：" << endl;
findstudent(stu);
}
if (1 == n)
{
cout << "请输入学生学号：" << endl;
cin >> id;
ifstream infile("student.txt", ios::in);//定义输入文件流对象，以输入方式打开磁盘文件"student.txt"
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
infile.close();
for (i = 1; i <= stu.length; i++)
{
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
if (stu.r[i].id == id)
cout << stu.r[i].id << setw(8) << stu.r[i].name << setw(8) << stu.r[i].dormid << endl;
}
infile.close();//关闭磁盘文件
}
if (2 == n)
{
cout << "请输入学生姓名：" << endl;
cin >> name;
ifstream infile("student.txt", ios::in);//定义输入文件流对象，以输入方式打开磁盘文件"student.txt"
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
infile.close();
for (i = 1; i <= stu.length; i++)
{
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
if (stu.r[i].name == name)
cout << stu.r[i].id << setw(8) << stu.r[i].name << setw(8) << stu.r[i].dormid << endl;
}
infile.close();//关闭磁盘文件
}
if (3 == n)
{
cout << "请输入学生宿舍号：" << endl;
cin >> dormid;
ifstream infile("student.txt", ios::in);//定义输入文件流对象，以输入方式打开磁盘文件"student.txt"
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
infile.close();
for (i = 1; i <= stu.length; i++)
{
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
if (stu.r[i].dormid == dormid)
cout << stu.r[i].id << setw(8) << stu.r[i].name << setw(8) << stu.r[i].dormid << endl;
}
}
}
//修改学生信息
void renewstudent(sqlist &stu)
{
int n;
string id, name, dormid;
cout << "1.姓名 2.宿舍号" << endl;
cout << "请输入您的选择（1~2）：" << endl;
cin >> n;
cout << "请输入需要修改学生的学号" << endl;
cin >> id;
if (n != 1 && n != 2)
{
cout << "输入有误，请重新输入：" << endl;
renewstudent(stu);
}
if (1 == n)
{
cout << "请输入修改姓名" << endl;
cin >> name;
int i = 0;
ifstream infile("student.txt", ios::in);
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
infile.close();
for (i = 1; i <= stu.length; i++)//先找到再修改
{
if (stu.r[i].id == id)
{
stu.r[i].name = name;
insertsort(stu);
return;
}
}
}
if (2 == n)
{
int i;
cout << "请输入修改宿舍号" << endl;
cin >> dormid;
ifstream infile("student.txt", ios::in);
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
infile.close();
for (i = 1; i <= stu.length; i++)//先找到再修改
{
if (stu.r[i].id == id)
{
stu.r[i].dormid = dormid;
insertsort(stu);
return;
}
}
}
}
//显示宿舍信息
void showstudent(sqlist &stu)
{
string a, b, c;
int i;
cout << "学生的信息如下：" << endl;
cout << "**********************************" << endl;
ifstream infile("student.txt", ios::in);
if (!infile) { //如果文件打开失败
cout << "文件打开失败" << endl;
exit(1);
}
/*infile >> a >> b >> c;//从磁盘文件读入
cout << a << setw(8) << b << setw(8) << c << endl;//在显示器上显示*/
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
cout << stu.r[i].id << setw(8) << stu.r[i].name << setw(8) << stu.r[i].dormid << endl;
}
infile.close();
}
//删除宿舍信息
void deletstudent(sqlist &stu)
{
int i, j;
string a, b, c, id;
cout << "请输入删除学生学号" << endl;
cin >> id;
ifstream infile("student.txt", ios::in);//定义输入文件流对象，以输入方式打开磁盘文件"student.txt"
infile >> stu.length;
for (i = 1; i <= stu.length; i++) {
infile >> stu.r[i].id >> stu.r[i].name >> stu.r[i].dormid;
}
infile.close();
for (i = 1; i <= stu.length; i++)//先找到再删除
{
if (stu.r[i].id == id)
{
for (j = i; j<stu.length; j++)
stu.r[j] = stu.r[j + 1];
stu.length--;
insertsort(stu);
return;
}
}
}
//主函数
int main()
{
sqlist stu;
int n;
for (;;)
{
cout << "**************************宿舍管理查询软件**************************" << endl;
cout << "1. 创建学生信息" << endl; //initlist
cout << "2. 增加学生信息" << endl; //addstudent
cout << "3. 查询学生信息" << endl; //findstudent
cout << "4. 显示学生信息" << endl; //showstudent
cout << "5. 修改学生信息" << endl; //renewstudent
cout << "6. 删除学生信息" << endl; //deletstudent
cout << "0. 退出系统" << endl;
cout << "*******************************************************************" << endl;
cout << "请输入你需要的操作（0~6）：" << endl;
cin >> n;
switch (n)
{
case 1:
cout << "输入学生人数" << endl;
cin >> stu.length;
initlist(stu);
cout << "###########################################" << endl;
break;
case 2:
addstudent(stu);
cout << "###########################################" << endl;
break;
case 3:
findstudent(stu);
cout << "###########################################" << endl;
break;
case 4:
showstudent(stu);
cout << "###########################################" << endl;
break;
case 5:
renewstudent(stu);
cout << "###########################################" << endl;
break;
case 6:
deletstudent(stu);
cout << "###########################################" << endl;
break;
case 0:
cout << "您已退出系统！" << endl;
return 0;
}
}
system("pause");
return 0;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
