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【GESP 四级】一个程序掌握大部分知识点

news 2025/6/30 6:59:33

文章目录

程序简介
程序信息
- 项目目录
- 源代码
- - functions.h
  - headfile.h
  - main.cpp

程序简介

这是一个类似学生信息管理的程序，用 C++ 编写。涵盖了 GESP 四级的大部分知识点：

指针的基础用法
结构体的基础用法
try-catch的基础用法
<fstream>的基础用法

程序信息

项目目录

~ $ ls -a
.
..
./data.txt
./functions.h
./headfile.h
./main.cpp

源代码

functions.h

#pragma ones
#include "headfile.h"void write_file(Student data)
{ofstream OutFile(PATH, ios::app);if (!OutFile){throw "无法打开文件";}OutFile << data.name << data.age << data.score;OutFile.close();
}void read_file(void)
{string name;int age;float score;ifstream InFile(PATH, ios::in);if (!InFile){throw "无法打开文件";}cout << "姓名\t年龄\t分数" << endl;cout << "--------------" << endl;while(InFile >> name >> age >> score){cout << name << "\t" << age << "\t" << score;}InFile.close();
}

headfile.h

#pragma ones
#include <iostream>
#include <fstream>
#include <cstdlib>
#define PATH ".\\data.txt"using namespace std;
struct Student
{string name;int age;float score;
};
void write_file(Student data);
void read_file(void);

main.cpp

#include "functions.h"int main(void)
{int flag;int n;string error;error = "输入错误"string *p;p = &error;cout << "请输入您需要的操作：\n1.载入数据\t2.读取数据" << endl;cin >> flag;if (flag == 1){cout << "请输入需要载入的数据组数：";cin >> n;for (int i = 1; i <= n; i++){Student student;cout << "姓名：";cin >> student.name;cout << "年龄：";cin >> student.age;cout << "成绩：";cin >> student.score;cout << endl;try{write_file(student);}catch (const char* msg){cerr << "Error: " << msg << endl;return EXIT_FAILURE;}catch (...){cerr << "Error: 未知错误。" << endl;return EXIT_FAILURE}}}else if (flag == 2){try{read_file();}catch (const char* msg){cerr << "Error: " << msg << endl;return EXIT_FAILURE;}catch (...){cerr << "Error: 未知错误。" << endl;return EXIT_FAILURE;}}else{cout << *p << endl;return EXIT_FAILURE;}return EXIT_SUCCESS;
}