c++学习笔记

来源：互联网发布：游族网络工资编辑：程序博客网时间：2024/06/04 17:47

一、c++是一门面对对象的编程语言，按照封装的原则，一般情况下其数据成员设置为私有成员也即是（private）,那么我们怎么样去访问或者应用私有成员呢？

1、利用公共函数访问私有成员

#include<iostream>using namespace std;class MyTest{private:int data1;int data2;public:void setdata1(int x){data1 = x;}void setdata2(int y){data2 = y;}void display(){cout << "x=" << data1 << " " << "y=" << data2<<endl;}};int main(){MyTest T;T.setdata1(2);T.setdata2(3);T.display();return 0;}

2、利用指针访问私有成员

#include<iostream>using namespace std;class MyTest{private:int data1;int data2;public:void setdata1(int x){data1 = x;}void setdata2(int y){data2 = y;}void getxy(int *x, int *y){*x = data1;*y = data2;}};int main(){MyTest T;int x, y;T.setdata1(2);T.setdata2(3);T.getxy(&x, &y);cout << "x=" <<x << " " << "y=" << y << endl;return 0;}

3、利用设置函数访问私有成员

#include<iostream>using namespace std;class MyTest{private:int data1;int data2;public:int setdata1(int x){data1 = x;return data1;}int setdata2(int y){data2 = y;return data2;}};int main(){MyTest T;int x, y;x=T.setdata1(2);y=T.setdata2(3);cout << "x=" <<x << " " << "y=" << y << endl;return 0;}

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