cpp 多态的计算器例子。

zds212

[C++] 纯文本查看 复制代码

#include<iostream>
using namespace std;
#include<string>

class jsj//普通类
{
public:
	int a, b;
	void get(int a,int b)
	{
		this->a = a;
		this->b = b;
	}
	int jg(string fh)
	{
		if (fh == "+")
		{
			return a + b;
		}
		else if (fh == "-")
		{
			return a - b;
		}
		else if (fh == "*")
		{
			return a * b;
		}
		else if (fh == "/")
		{
			return a / b;
		}
	}
};

void test01()
{
	jsj j1;
	j1.get(10, 20);
	cout << "+法  " << j1.jg("+") << "  -法  " << j1.jg("-") << "  *法  " << j1.jg("*") << "  /法  " << j1.jg("/") <<endl;
}

int main()
{
	test01();
	system("pause");
	return 0;
}

普通类不方便后面维护

[C++] 纯文本查看 复制代码

#include<iostream>
using namespace std;
#include<string>

class absjsj//多态实现计算机
{
public:
	virtual int js()
	{
		return 0;
	}
	int a, b;
};

class add:public absjsj
{
public:
	int js()
	{
		return a + b;
	}
};
class sub :public absjsj
{
public:
	int js()
	{
		return a - b;
	}
};
class ride :public absjsj
{
public:
	int js()
	{
		return a * b;
	}
};
class exc :public absjsj
{
public:
	int js()
	{
		return a / b;
	}
};

void test01()
{
	absjsj* abs = new add;
	abs->a = 10;
	abs->b = 5;
	cout <<"加法"<< abs->js() << endl;
	delete abs;
	abs = new sub;
	abs->a = 10;
	abs->b = 3;
	cout << "减法" << abs->js() << endl;
	delete abs;
	abs = new ride;
	abs->a = 9;
	abs->b = 8;
	cout << "乘法" << abs->js() << endl;
	delete abs;
	abs = new exc;
	abs->a = 8;
	abs->b = 4;
	cout << "除法" << abs->js() << endl;
	delete abs;
}


int main()
{
	test01();
	system("pause");
	return 0;
}

多态更方便实现后期的维护。

lfm333

感谢楼主辛苦分享

加奈绘

感谢分享，这就去实现一下

nanaqilin

这个是继承和多态

sam喵喵

再加上模版，把处理的数据类型也抽象出来

304775988

好棒,用到了virtual函数

zds212

[C++] 纯文本查看 复制代码

纯虚函数的实现案例，冲咖啡

[C++] 纯文本查看 复制代码

#include<iostream>
using namespace std;

class absreactdrinking//纯虚函数的实现
{
public:
	//煮水
	virtual void boil() = 0;
	//冲泡
	virtual void brew() = 0;
	//倒入杯中
	virtual void pourincup() = 0;
	//加辅料
	virtual void putsomething() = 0;
	void makedrink()
	{
		boil();
		brew();
		pourincup();
		putsomething();
	}
};

class coffee :public absreactdrinking
{
public:
	//煮水
	virtual void boil()
	{
		cout<<"煮神水"<<endl;
	}
	//冲泡
	virtual void brew()
	{
		cout << "冲咖啡" << endl;
	}
	//倒入杯中
	virtual void pourincup()
	{
		cout<<"倒杯"<<endl;
	}
	//加辅料
	virtual void putsomething()
	{
		cout << "加糖" << endl;
	}
};

void dowork(absreactdrinking* abs)
{
	abs->makedrink();
	delete abs;
}

void test()
{
	//创建咖啡
	dowork(new coffee);
}
int main()
{
	test();
	system("pause");
	return 0;
}

千鸟·伶

谢大佬分享

隐与匿

谢谢楼主分享。
THANK YOU VERY MUCH.