十七周作业1

来源：互联网发布：张家港法院拍卖淘宝网编辑：程序博客网时间：2024/04/29 21:01

#include<iostream>
#include<string>
#include<iomanip>
#include<fstream>
using namespace std;

class Student
{
public:
    Student();
    Student(string name, double cpp, double math, double English);
    double all_score();
    double ave_score();
    void read_score(ifstream &in);
    void write_score(ofstream &out);
    void display();
private:
    string name;
    double score_cpp;
    double score_math;
    double score_English;
    double score_all;
    double score_average;
};

Student::Student()
{
    this->name = "0000";
    this->score_cpp = 0;
    this->score_math = 0;
    this->score_English = 0;
}

Student::Student(string name, double cpp, double math, double English)
{
    this->name = name;
    this->score_cpp = cpp;
    this->score_math = math;
    this->score_English = English;
}

void Student::display()
{
    this->all_score();

    this->ave_score();

    cout << setiosflags(ios::left) << setw(12) << this->name << setw(8) << this->score_cpp << setw(8) << this->score_math << setw(8) << this->score_English << setw(8) << this->score_all <<setw(8)<<this->score_average<< endl;
}

double Student::all_score()
{
    this->score_all = this->score_cpp + this->score_math + this->score_English;
    return this->score_all;
}

double Student::ave_score()
{
    this->score_average = (this->score_cpp + this->score_math + this->score_English) / 3;
    return this->score_average;
}

void Student::read_score(ifstream &in)
{
    in >> this->name >> this->score_cpp >> this->score_math >> this->score_English;
}


void Student::write_score(ofstream &out)
{
    out << this->name << '\t' << this->score_cpp << '\t' << this->score_math << '\t' << this->score_English << endl;
}

void readfile(Student * s, int num)
{
    ifstream infile("score.dat",ios::in);

    if(!infile)
    {
        cerr << "open error!" << endl;
        exit(1);
    }

    for(int i = 0; i < num; ++i)
    {
        s[i].read_score(infile);
    }
    infile.close();
}

void Readfile(Student * s, int num)
{
    ifstream infile("binary_score.dat",ios::in|ios::binary);

    if(!infile)
    {
        cerr << "open error!" << endl;
        abort();
    }

    for(int i = 0; i < num; ++i)
    {
        infile.read((char *) & s[i], sizeof(s[i]));
    }

    infile.close();
}

void writefile(Student * s, int num)
{
    ofstream outfile("binary_score.dat",ios::out|ios::binary);

    if(!outfile)
    {
        cerr << "open error!" << endl;
        abort();
    }

    for(int i = 0; i < num; ++i)
    {
        outfile.write((char *) & s[i], sizeof(s[i]));
    }

    outfile.close();
}

void Writefile(Student * s, int num)
{
    ofstream outfile("binary_score2.dat",ios::out);

    if(!outfile)
    {
        cerr << "open error!" << endl;
        abort();
    }

    for(int i = 0; i < num; ++i)
    {
        s[i].write_score(outfile);
    }

    outfile.close();
}

int main()
{
    Student stu[100], stu1[101], my_score("陈文洁", 100, 100, 100);

    readfile(stu, 100);

    writefile(stu, 100);

    Readfile(stu1, 100);

    stu1[100] = my_score;

    cout << setiosflags(ios::left) << setw(12) << "姓名" << setw(8) << "C++" << setw(8) << "高数" << setw(8) << "英语" << setw(8) <<"总分" << setw(8) << "平均分" << endl;

    for(int i = 0; i < 101; ++i)
    {
        stu1[i].display();
    }

    Writefile(stu1, 101);

    system("pause");
    return 0;
}