其实本设计模式可以实现一些像人工智能式的问答。

这个跟人回答问题差不多，根据不同的问题作出不同的回答，而且在不同的状态，也会作出不同的回答。

如果有大量的数据，那么就可以作出千变万化的问答效果来哦。

#include <stdio.h>

enum STATE
{
	HUNGARY, EAT, FULL
};

class State
{
	STATE myState;
public:
	State(STATE s = HUNGARY) : myState(s)
	{

	}

	void eat()
	{
		switch (myState)
		{
		case State_2::HUNGARY:
			puts("Good, I am hungary now. I would like something to eat.");
			myState = EAT;
			break;
		case State_2::EAT:
			puts("I am still eating. I am not finished, yet.");
			break;
		case State_2::FULL:
			puts("Not, Thanks. I am full now.");
			break;
		default:
			break;
		}
	}

	void hungary()
	{
		switch (myState)
		{
		case State_2::HUNGARY:
			puts("I am starving! I need to eat something!");
			break;
		case State_2::EAT:
			puts("I am still hungary, I want to eat more.");
			break;
		case State_2::FULL:
			puts("Now, I am feeling hungary again.");
			myState = HUNGARY;
			break;
		default:
			break;
		}
	}

	void full()
	{
		switch (myState)
		{
		case State_2::HUNGARY:
			puts("I am not full, I need to eat something first.");
			break;
		case State_2::EAT:
			puts("Great, I am full now. Thank you.");
			myState = FULL;
			break;
		case State_2::FULL:
			puts("Yeah, can not be more satisfied. I am full, and full again.");
			break;
		default:
			break;
		}
	}
};

int main()
{
	State Bill;

	puts("\nWhen Bill is in HUNGARY state:");
	puts("Are you hungary, Bill?");
	Bill.hungary();
	puts("Are you full, Bill?");
	Bill.full();
	puts("Would you like something to eat, Bill?");
	Bill.eat();	//Change state

	puts("\nWhen Bill is in EAT state:");
	puts("Would you like something to eat, Bill?");
	Bill.eat();
	puts("Are you hungary, Bill?");
	Bill.hungary();
	puts("Are you full, Bill?");
	Bill.full();	//Change state

	puts("\nWhen Bill is in FULL state:");
	puts("Are you full, Bill?");
	Bill.full();
	puts("Would you like something to eat, Bill?");
	Bill.eat();
	puts("Are you hungary, Bill?");
	Bill.hungary();	//Change state

	return 0;
}