C语言状态机

#include 
#include

int main()
{
	
	int num = 0;
	int i = 0;
	int state = -1;
	srand((unsigned)time(NULL));
	while(1)
	{	
		if(i>50)return 0;

		sleep(1);
		switch(state)
		{
			case -1:
				if(i<10)
				{
					printf("Starting ...\n");
				}
				else if(i>=10 && i<=30)
				{
					printf("From Starting to Running ...\n");
					state = 0;
				}
				else if(i>30)
				{
					printf("From Starting to Ending ...\n");
					state = 1;
				}
				break;


			case 0:
				if(i<10)
				{
					printf("From Starting to Exception ...\n");
					state = -1;
				}
				else if(i>=10 && i<=30)
				{
					printf("Running ...\n");
					
				}
				else if(i>30)
				{
					printf("From Runing to Ending ...\n");
					state = 1;
				}
				break;

				
			case 1:
				if(i<10)
				{
					printf("From Ending to Exception ...\n");
					state = -1;
				}
				else if(i>=10 && i<=30)
				{
					printf("From Ending to Running ...\n");
					state = 0;
				}
				else if(i>30)
				{
					printf("Ending ...\n");
					state = 1;
				}

		}

		i=rand()%61+0;
		printf("i = %d\n",i);

	}


}

状态值state有三个，分别为 -1,0,1。

-1表示正在开机，0表示正在工作，1表示正在关机。

当i<10表示机器在开机，>=10 &&<=30时表示正在工作，>30表示正在关机。

我们可以清楚的知道机器从某个状态变为另一个状态并做出相应的打印（工作）。

 

结果如下：

Starting ...
i = 15
From Starting to Running ...
i = 36
From Runing to Ending ...
i = 31
Ending ...
i = 4
From Ending to Exception ...
i = 56