stu.show();
,stu 就是当前对象,this 就指向 stu。#include <iostream> using namespace std; class Student{ public: void setname(char *name); void setage(int age); void setscore(float score); void show(); private: char *name; int age; float score; }; void Student::setname(char *name){ this->name = name; } void Student::setage(int age){ this->age = age; } void Student::setscore(float score){ this->score = score; } void Student::show(){ cout<<this->name<<"的年龄是"<<this->age<<",成绩是"<<this->score<<endl; } int main(){ Student *pstu = new Student; pstu -> setname("李华"); pstu -> setage(16); pstu -> setscore(96.5); pstu -> show(); return 0; }运行结果:
setname(char *name)
为例,它的形参是name
,和成员变量name
重名,如果写作name = name;
这样的语句,就是给形参name
赋值,而不是给成员变量name
赋值。而写作this -> name = name;
后,=
左边的name
就是成员变量,右边的name
就是形参,一目了然。->
来访问成员变量或成员函数。printThis()
,专门用来输出 this 的值,如下所示:
void Student::printThis(){ cout<<this<<endl; }然后在 main() 函数中创建对象并调用 printThis():
Student *pstu1 = new Student; pstu1 -> printThis(); cout<<pstu1<<endl; Student *pstu2 = new Student; pstu2 -> printThis(); cout<<pstu2<<endl;运行结果:
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