把课上strcut的练习，尝试着改成class

#include <iostream>

using namespace std;
class Stu
{
private:
    int age;
    string sex;
    int hign;
public:
    int soce;
    void get_information();
    void set_information();
};
void Stu::set_information()
{
    static Stu s1;
    cout << "请输入年龄:" << endl;
    cin >> s1.age;
    age = s1.age;
    cout << "请输入性别:" << endl;
    cin >> s1.sex;
    sex = s1.sex;
    cout << "请输入身高:" << endl;
    cin >> s1.hign;
    hign = s1.hign;
    cout << "请输入分数:" << endl;
    cin >> s1.soce;
    soce = s1.soce;
}
void Stu::get_information()
{
    cout << "年龄:" << "";
    cout << age << endl;
    cout << "性别:" << "";
    cout << sex << endl;
    cout << "身高:" << "";
    cout << hign << endl;
    cout << "分数:" << "";
    cout << soce << endl;
}
int main()
{
    Stu s2;
    s2.set_information();
    s2.get_information();
    return 0;
}

 效果图:

写一个有默认参数的函数，把声明和定义分开，并在主函数内成功调用

#include <iostream>

using namespace std;
int add(int a,int b=20,int c=30);
int main()
{
    cout << add(10) <<endl;
    return 0;
}

int add(int a,int b,int c)
{
    return a+b+c;
}

效果图: