c++ class 类

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

class STU_INFO
{
  private:
    string name = "unknown";
    string sex = "unknown";
    int age = -1;
    
  public:
    void setName(string);
    void setSex(string);
    void setAge(int);
    void log();
};

void STU_INFO::setName(string _name)
{
    // 直接通过变量名赋值
    name = _name;
}

void STU_INFO::setSex(string _sex)
{
    // 显式通过this指针访问变量
    this->sex = _sex;
}

void STU_INFO::setAge(int _age)
{
    // 通过圆点运算符访问
    (*this).age = _age;
}

void STU_INFO::log()
{
    cout << ("=========================") << endl;
    cout << ("name:\t") << ((*this).name) << endl;
    cout << ("sex:\t") << (sex) << endl;
    cout << ("age:\t") << (this->age) << endl;
}

int main()
{
    // 创建对象
    STU_INFO students;

    // 未赋值，打印默认值
    students.log();

    // 设置新值并打印
    students.setName("Fan");
    students.setSex("男");
    students.setAge(29);
    students.log();

    // 设置新值并打印
    students.setName("Ye_er");
    students.setSex("女");
    students.setAge(30);
    students.log();
    
    return 0;
}