根据下列Vector类定义，编程完成Vector类的具
根据下列Vector类定义，编程完成Vector类的具体实现：
class Vector
{
friend ostream &operator<<(ostream &out, const Vector &v);
private:
int *data;
int size;
public:
Vector();
Vector(int a[],int n);
Vector(const Vector &s);
~Vector();
Vector &operator=(const Vector &v);
int &operator[](int index);
};答案
#include<iostream>
using namespace std;
class Vector
{
friend ostream &operator<<(ostream &out, const Vector &v);
private:
int *data;
int size;
public:
Vector();
Vector(int a[],int n);
Vector(const Vector &s);
~Vector();
Vector &operator=(const Vector &v);
int &operator[](int index);
};
Vector::Vector()
{
data=NULL;
size=0;
}
Vector::Vector(int a[],int n)
{
size = n;
data = new int[size];
for(int i=0;i<size;i++)
data[i]=a[i];
}
Vector::Vector(const Vector &s)
{
size = s.size;
data = new int[size];
for(int i=0;i<size;i++)
data[i]=s.data[i];
}
Vector::~Vector()
{
if(data!=NULL)
delete[]data;
}
Vector Vector::&operator=(const Vector &v)
{
if(this == &v)
return *this;
if(size != v.size)
{
delete[] data;
size = v.size;
data = new int[size];
}
for(int i=0;i<=size;i++)
data[i] = v.data[i];
return *this;
}
int Vector::&operator[](int index)
{
return data[index];
}
ostream &operator<<(ostream &out, const Vector &v)
{
for(int i=0;i<v.size;i++)
out<<v.data[i]<<" ";
return out;
}