Biegral Blog

        1. overload:

#include <iostream>
using namespace std;

void print(int x)
{
	cout << "int C++" << endl;
}

void print(char c)
{
	cout << "char C++" << endl;
}

int main()
{
	int n = 1;
	char ch = 'a';
	print(n);
	print(ch);

	return 0;
}

      结果为：

int C++
char C++

      2. 隐藏：

#include <iostream>
using namespace std;

class A
{
public:
	void print(int x)
	{
		cout << "int C++" << endl;
	}
};

class B : public A
{
public:
	void print(int x)
	{
		cout << "char C++" << endl;
	}
};

int main()
{
	int n = 1;
	char ch = 'A';

	A a;
	a.print(n);

	B b;
	b.print(ch);

	return 0;
}

     结果为：

int C++
char C++
      下面再看一个隐藏的例子（千万要注意，下面这个程序并不是override）：

#include <iostream>
using namespace std;

class A
{
public:
	virtual void print(int x)
	{
		cout << "int C++" << endl;
	}
};

class B : public A
{
public:
	virtual void print(char x)
	{
		cout << "char C++" << endl;
	}
};

int main()
{
	int n = 1;
	char ch = 'A';

	A a, *p;
	p = &a;
	p->print(n);

	B b;
	p = &b;
	p->print(ch);

	return 0;
}

      结果为：

int C++
int C++

      3. override

#include <iostream>
using namespace std;

class A
{
public:
	virtual void print(int x)
	{
		cout << "int C++" << endl;
	}
};

class B : public A
{
public:
	virtual void print(int x)
	{
		cout << "char C++" << endl;
	}
};

int main()
{
	int n = 1;
	char ch = 'A';

	A a, *p;
	p = &a;
	p->print(n);

	B b;
	p = &b;
	p->print(ch);

	return 0;
}

      结果为：

int C++
char C++