#include<iostream>
//#include<time.h>
#include<string>
#include<vector>
using namespace std;
//class Bank
//{
//private:
// long number;
// double rest;
// string records[50];
// int N;
//public:
// Bank(long number, double rest)
// {
// this->number = number;
// this->rest = rest;
// this->N = 0;
// }
// void Bankin(double m)
// {
// this->rest += m;
// time_t now = time(0);
// char x[30];
// ctime_s(x, sizeof(x), &now);
// this->records[N++] = (string)"交易时间为:" +x + (string)"交易类型为:存钱 " + (string)"交易金额为:" + to_string(m);
// }
// void Bankout(double m)
// {
// if (m > this->rest)
// {
// cout << "余额不足" << endl;
// return;
// }
// this->rest -= m;
// time_t now = time(0);
// char x[30];
// ctime_s(x, sizeof(x), &now);
// this->records[N++] = (string)"交易时间为:" + x + (string)"交易类型为:取钱 " + (string)"交易金额为:" + to_string(m);
// }
// friend void disp(Bank& b);
//};
//void disp(Bank& b)
//{
// cout <<b.number<<"账户剩余余额为:" << b.rest << endl;
// cout << "该账户共有" << b.N << "条交易记录" << endl;
// for (int i = 0; i < b.N; i++)
// {
// cout << b.records[i] << endl;
// }
//}
const int x = 3;//课程数量
const int m = 2;//学生人数
class Student
{
private:
string name;
long long id;
vector<double> price;
static int sum, unpass;
public:
Student() {
this->id = 0;
this->name = '0';
price.push_back(0);
price.push_back(0);
price.push_back(0);
}
Student(string name, long long id, double cxsj, double xhcl, double sjjg)
{
this->id = id;
this->name = name;
price.push_back(cxsj);
price.push_back(xhcl);
price.push_back(sjjg);
sum++;
if (this->aver() < 60) unpass++;
}
double aver()
{
double sum = 0;
for (int i = 0; i < x; i++)
{
sum += price[i];
}
return sum / x;
}
static void disp();
void print_price() {
cout << "程序设计成绩为：" << this->price[0];
cout << " 信号处理成绩为：" << this->price[1];
cout << " 数据结构成绩为：" << this->price[2];
cout << " 平均成绩为：" << this->aver() << endl;
}
};
int Student::sum = 0;
int Student::unpass = 0;
void Student::disp()
{
cout << "总人数为： " << sum << endl;
cout << "不及格人数为：" << unpass << endl;
}
int main() {
string name;
long long id;
double cxsj;
double xhcl;
double sjjg;
Student a[m];
for (int i = 0; i < m; i++)
{
cin >> name >> id >> cxsj >> xhcl >> sjjg;
a[i]=(Student(name, id, cxsj, xhcl, sjjg));
a[i].print_price();
}
Student::disp();
return 0;
}
默认函数构造的重要性：
当我定义Student a[m]时，默认构造函数会被调用，如果默认构造函数被有参构造函数覆盖时，又不传参，会出现报错，此时应该重载无参构造函数
Student类实验中还遇到了前向引用申明的问题，尽管我声明了class类，但依旧不能在class细节实现前不能定义该类对象。还有本程序也有一定弊端，就是如果我想添加课程数量，那么也就得修改构造函数以及添加课程成员，不知道该如何优化，以及输出成绩之类的都得加上一定的语句，感觉添加课程需要修改大量的代码，希望在以后的学习当中能解决这个问题。
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