构建一个学生类Student,含有字符串name,整数成员age及双精度score,函数Init含三个默认参数初始化学生对象(xiaoming,18,88.65)。成员函数print没有形参,需使用this指针,显示对象数据成员的内容。要求编写程序声明两个对象s1、s2,其中s2使用默认参数进行初始化,并显示学生对象数据成员的值。

A：

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

class Student {
private:
    string name;
    int age;
    double score;
public:
    void Init(string n = "xiaoming", int a = 18, double s = 88.65) {
        name = n;
        age = a;
        score = s;
    }
    void print() {
        cout << "Name: " << name << endl
             << "Age: " << age << endl
             << "Score: " << score << endl;
    }
};

int main() {
    Student s1, s2;
    s1.Init("xiaohong", 20, 90.0);
    s2.Init();
    cout << "s1:\n";
    s1.print();
    cout << "s2:\n";
    s2.print();
    return 0;
}

输出：

s1:
Name: xiaohong
Age: 20
Score: 90
s2:
Name: xiaoming
Age: 18
Score: 88.65