学生考试成绩计算及基本管理程序c++实现（带文件操作）

课程设计没有选很难，因为最近的学习内容很多，选了一个比较熟悉的课题。

昨天晚上花了几个小时写完基本功能，今天加入了文件操作和debug

用了STL之后比上学期的教师工资管理系统代码量更少，写起来也更方便一些。

部分效果图

 

txt文件的截图

 

代码由main.cpp和student.h组成

#include<iostream> #include<stdio.h> #include<stdlib.h> #include"student.h" using namespace std; //-----------------------------------------------菜单-------------------------------------------------------------- void menu() { system("color F5"); system("mode con cols=150 lines=40"); printf("\n\n\n\n\n\n\n\n\n\n\n"); printf("\t\t\t\t\t\t\t**********欢迎使用学生成绩管理系统**********"); printf("\n\n"); printf("\n"); printf("\t\t\t\t\t\t|1.录入学生信息"); printf("\t\t\t\t\t|2.删除学生信息"); printf("\n\n"); printf("\t\t\t\t\t\t|3.浏览学生信息"); printf("\t\t\t\t\t|4.修改学生信息"); printf("\n\n"); printf("\t\t\t\t\t\t|5.查找学生信息"); printf("\t\t\t\t\t|0.退出管理系统"); printf("\n\n\n\n"); printf("\t\t\t\t\t请输入你想要的项目的序号："); } int main() { xt p; vector<student>stu; Read(stu); while (1) { menu(); fflush(stdin); int choise = 0; cin >> choise; fflush(stdin); //清理缓冲区 system("cls"); //清屏 switch (choise) { case 0: printf("\n\n\n\n\n\n\n\n\n\n\n\t\t\t\t\t\t\t\t正常退出！\n\t\t\t\t\t\t\t\t"); system("pause"); exit(0); break; case 1: p.AddStu(stu); break; case 2: p.DelStu(stu); break; case 3: p.ShowStu(stu); break; case 4: p.AltStu(stu); break; case 5: p.FindStu(stu); } p.SortStu(stu); Save(stu); system("pause"); system("cls"); } return 0; } #pragma once #include<iostream> #include<stdio.h> #include<stdlib.h> #include<fstream> #include<cstring> #include<vector> #include<algorithm> #include<sstream> using namespace std; const string fileName = "grade.txt"; class student { public: string name; int id; double Final; double Mid; double Usual; double Grade; }s; bool Comp(student a, student b) { return a.Grade > b.Grade;//从大到小排 } class xt { public: void AddStu(vector<student>& stu); void DelStu(vector<student>& stu); void AltStu(vector<student>& stu); void ShowStu(vector<student>& stu); void FindStu(vector<student>& stu); void CountGrade(vector<student>& stu); void SortStu(vector<student>& stu); }; void xt::CountGrade(vector<student>& stu) { vector<student>::iterator it; for (vector<student>::iterator it = stu.begin(); it != stu.end(); it++) { it->Grade = (it->Final) * 0.4 + (it->Mid) * 0.2 + (it->Usual) * 0.4; } } void xt::SortStu(vector<student>& stu) { sort(stu.begin(), stu.end(), Comp); } void xt::AddStu(vector<student>& stu) { cout << "\t\t\t\t\t 请输入学生学号："; cin >> s.id; cout << "\t\t\t\t\t 请输入学生姓名："; cin >> s.name; cout << "\t\t\t\t\t 请输入学生期中成绩："; cin >> s.Mid; cout << "\t\t\t\t\t 请输入学生期末成绩："; cin >> s.Final; cout << "\t\t\t\t\t 请输入学生平时成绩："; cin >> s.Usual; stu.push_back(s); xt::CountGrade(stu); } void xt::DelStu(vector<student>& stu) { int n; cout << "\t\t\t\t\t 输入你要删除学生的学号 :"; cin >> n; vector<student>::iterator it; for (it = stu.begin(); it != stu.end(); it++) { if ((*it).id == n) { stu.erase(it); return; } } cout << endl << endl; cout << "\t\t\t\t\t 没有找到这名同学！" << endl; } void xt::ShowStu(vector<student>& stu) { int t = 1; cout << "排名\t\t学号\t\t姓名\t\t 期中成绩\t\t 期末成绩\t\t 平时成绩\t\t 总成绩" << endl; for (vector<student>::iterator it = stu.begin(); it != stu.end(); it++,t++) { cout <<t<< "\t\t" << (*it).id << "\t\t" << (*it).name << "\t\t\t" << (*it).Mid << "\t\t\t" << (*it).Final << "\t\t\t" << (*it).Usual << "\t\t\t" << (*it).Grade << endl; cout << "--------------------------------------------------------------------------------------------------------------------------------------------" << endl; } } void xt::FindStu(vector<student>& stu) { string n; vector<student>::iterator it; //迭代器 cout << "\t\t\t\t\t 输入你要查看学生的姓名 :"; cin >> n; for (it = stu.begin(); it != stu.end(); it++) { if ((*it).name == n) { cout << "该名学生信息如下："<<endl << endl; cout << "\t\t学号\t\t姓名\t\t 期中成绩\t\t 期末成绩\t\t 平时成绩\t\t 总成绩" << endl; cout << "\t\t" << (*it).id << "\t\t" << (*it).name << "\t\t\t" << (*it).Mid << "\t\t\t" << (*it).Final << "\t\t\t" << (*it).Usual << "\t\t\t" << (*it).Grade << endl; cout << endl << endl; break; } } if (it == stu.end()) { cout << endl << endl; cout << "\t\t\t\t\t 没有找到这名同学！" << endl; } } void xt::AltStu(vector<student>& stu) { int n; vector<student>::iterator it; //迭代器 cout << "\t\t\t\t\t 输入你要修改学生的学号 :"; cin >> n; for (it = stu.begin(); it != stu.end(); it++) { if ((*it).id == n) { cout << "\t\t学号\t\t姓名\t\t 期中成绩\t\t 期末成绩\t\t 平时成绩\t\t 总成绩" << endl; cout << "\t\t" << (*it).id << "\t\t" << (*it).name << "\t\t\t" << (*it).Mid << "\t\t\t" << (*it).Final << "\t\t\t" << (*it).Usual << "\t\t\t" << (*it).Grade << endl; cout << endl << endl; break; } } if (it == stu.end()) { cout << endl << endl; cout << "\t\t\t\t\t 错误的操作！ :" << endl; return; } int c=1; while (c) { cout << "\t\t\t\t\t 选择你要修改的信息:(1学号 2姓名 3期中成绩 4期末成绩 5平时成绩 0退出修改)"<<endl; cout << "\t\t\t\t\t "; cin >> c; switch (c) { case 1: cout << "\t\t\t\t\t 重新输入学号:"; cin >> s.id; (*it).id = s.id; break; case 2: cout << "\t\t\t\t\t 重新输入姓名:"; cin >> s.name; (*it).name = s.name; break; case 3: cout << "\t\t\t\t\t 重新输入期中成绩:"; cin >> s.Mid; (*it).Mid = s.Mid; break; case 4: cout << "\t\t\t\t\t 重新输入期末成绩:"; cin >> s.Final; (*it).Final = s.Final; break; case 5: cout << "\t\t\t\t\t 重新输入平时成绩:"; cin >> s.Usual; (*it).Usual = s.Usual; break; } cout << " -------------------------------------------------------------------------------------" << endl; } xt::CountGrade(stu); cout << endl << endl; cout << "\t\t\t\t\t 修改成功。。。" << endl; cout << "\t\t学号\t\t姓名\t\t 期中成绩\t\t 期末成绩\t\t 平时成绩\t\t 总成绩" << endl ; cout << "\t\t" << (*it).id << "\t\t" << (*it).name << "\t\t\t" << (*it).Mid << "\t\t\t" << (*it).Final << "\t\t\t" << (*it).Usual <<"\t\t\t"<<(*it).Grade<< endl; } //----------------------------------------文件操作---------------------------------------------------------------------------- void Read(vector<student>& stu) { ifstream in; in.open(fileName); string sline;//每一行 student t; while (getline(in, sline)) //逐行读取txt文件 { istringstream sin(sline); sin >> t.id >> t.name >> t.Mid>>t.Final>>t.Usual>>t.Grade ; stu.push_back(t); } in.close(); } void Save(vector<student>& stu) { ofstream desFile(fileName, ios::out); vector<student>::iterator it; for (vector<student>::iterator it = stu.begin(); it != stu.end(); it++) { desFile << "\t\t" << (*it).id << "\t\t" << (*it).name << "\t\t\t" << (*it).Mid << "\t\t\t" << (*it).Final << "\t\t\t" << (*it).Usual << "\t\t\t" << (*it).Grade << endl; } desFile.close(); }

 istringstream sin(sline);定义一个字符串输入流的对象sin,并调用sin的复制构造函数，将s中所包含的字符串放入sin 对象中

简单来说它的作用就是将一个含有多个空格的字符串分割开来

istringstream需要包含头文件#include<sstream>

 

其实是很想做ege的两个课题的，但是最近事情真的太多了，没有热情去学就没有办法做好。

游戏什么的等更厉害了再去做~