【对象数组+静态数据成员+静态成员函数+...】面向对象程序设计(B)——第二次作业

缺乏、安全感 2022-06-07 04:36 167阅读 0赞

Think:  
1知识点：对象数组+静态数据成员+静态成员函数+构造函数+复制构造函数+析构函数

题意：  
编程实现求一定数量的学生的平均分。用类实现，Student类属性有学号、姓名、成绩、总分、数量，成员函数有总分及平均分。  
输入：  
多组测试数据，每组测试数据先输入学生数量n(n <= 4000)，之后输入n行，每行输入第i个学生的学号，成绩，姓名，以空格分开  
输出：  
输出n个学生的总分和平均分，每组测试样咧以空格分开，详细格式参照样例输出  
样例输入：  
4  
1 100 a  
2 98 bb  
3 99 ccc  
4 99 dddd

1  
1234 100 abcd  
样例输出：  
sum = 396  
ave = 99

sum = 100  
ave = 100

以下为Accepted代码

#include <iostream>
    #include <algorithm>
    #include <string>
    
    using namespace std;
    
    const int test_size = 4014;
    
    class Student{
    private:
        int id, score;
        string name;
    public:
        static int sum, num;
        Student(){};
        Student(int new_id, int new_score, string new_name);
        Student(Student &t);
        ~Student(){};
        void cin_data(int new_id, int new_score, string new_name);
        static void pri_sum();
        static void pri_ave();
    };
    
    int Student::sum = 0;
    int Student::num = 0;
    
    Student::Student(int new_id, int new_score, string new_name){
        id = new_id;
        score = new_score;
        name = new_name;
        sum += score;
        num += 1;
    }
    Student::Student(Student &t){
        id = t.id;
        score = t.score;
        name = t.name;
        sum += score;
        num += 1;
    }
    void Student::cin_data(int new_id, int new_score, string new_name){
        id = new_id;
        score = new_score;
        name = new_name;
        sum += score;
        num += 1;
    }
    void Student::pri_sum(){
        cout << "sum = " << sum << endl;
    }
    void Student::pri_ave(){
        double ave = (double)sum / (double)num;
        cout << "ave = " << ave << endl;
    }
    
    int main(){
        int n, i, id, score;
        string name;
        Student test[test_size];
        while(cin >> n){
            Student::sum = 0;
            Student::num = 0;
            for(i = 0; i < n; i++){
                cin >> id >> score >> name;
                test[i].cin_data(id, score, name);
            }
            Student::pri_sum();
            Student::pri_ave();
            cout << endl;
        }
        return 0;
    }