1. 程式人生 > >如何在兩個類之間傳遞成員變數的值

如何在兩個類之間傳遞成員變數的值

本例是B類的的成員變數“m_getvariate” 得到A類的物件a的成員變數“m_betransed”的值,對值進行修改後,再把值賦給m_betransed。

1.B類構建公共函式——void getvalue(const int variate ) { m_getvariate = variate;},這個函式用來把A類的成員變數的值傳遞給B;

2.B類中的void changeValue( )函式來對變數的值進行修改;

3.B類構建公共函式——const int setValue( ){ return m_getvalue} 把值返回給B類。

示例程式碼:

#include <iostream>
using namespace std;
class B;
class A
{
    public:
    A( void );
    void f_init();
    void prinvariate();

    private:
    int m_betransed;
};
class B
{
    public:
    void getvariate( int  t_variate );
    void changeValue();
    int setvariate();

    private:
    int m_getvariate;
};

int main()
{
    A *a;
    a= new A;
    a->prinvariate( );
    return 0;

}

A::A()
{
    f_init();
}

void A::f_init()
{
    m_betransed = 2;
    B * b ;
    b = new B;
    b->getvariate( m_betransed );//b->m_getvariate = 2
    b->changeValue( );//b->m_getvariate = 3
    m_betransed = b->setvariate();//A->m_betransed = 3
}

void B::getvariate(int  t_variate )
{
    m_getvariate = t_variate;
}

void  A::prinvariate()
{
    cout << m_betransed;
}

void B::changeValue()
{
    ++m_getvariate;
}

int B::setvariate()
{
    return m_getvariate;
}