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C++ 構(gòu)造函數(shù)各種怪式一網(wǎng)打盡

1.正常無參（無初始值）

View Code

#include "iostream"
#include "string"
using namespace std;

class Point
{
public:
    Point()
    {
        cout<<"Default constructor called."<<endl;
        cout<<x<<" "<<y<<endl;
    }
private:
    int x, y;

};
int main()
{
    Point *ptr1=new Point();
    delete ptr1;
}

2.正常有參

View Code

#include "iostream"
#include "string"
using namespace std;

class Point
{
public:
    Point(int x, int y)
    {
        cout<<"Default constructor called."<<endl;
        cout<<x<<" "<<y<<endl;
    }
private:
    int x, y;

};
int main()
{
    Point *ptr1=new Point(1, 2);
    delete ptr1;
}

3.不正常無參（有初始值）

View Code

#include "iostream"
#include "string"
using namespace std;

class Point
{
public:
    Point():x(0),y(0)
    {
        cout<<"Default constructor called."<<endl;
        cout<<x<<" "<<y<<endl;
    }
private:
    int x, y;

};
int main()
{
    Point *ptr1=new Point();
    delete ptr1;
}

4.不正常有參

View Code

#include "iostream"
#include "string"
using namespace std;

class Point
{
public:
    Point(int x, int y):x(x),y(y)
    {
        cout<<"Default constructor called."<<endl;
        cout<<x<<" "<<y<<endl;
    }
private:
    int x, y;

};
int main()
{
    Point *ptr1=new Point(1, 2);
    delete ptr1;
}

posted on 2012-04-19 20:29 More study needed. 閱讀(239) 評論(0) 收藏舉報

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