随机产生0和1，进而产生‘+’‘-’

随机产生0和1，进而产生‘+’‘-’
头文件windows.h 借助sleep进行时间上的滞后

#include  
#include  
#include  
#include 
int * random01()//Generate random numbers 1 or 0
{
	static int rr[3];
	srand((unsigned int)time(NULL));//修改种子
	for (int i = 0; i < 3; i++)		
	{	
		rr[i]=rand();//设置范围  1-20
		Sleep(500);	// windows.h
	}
	return rr;
}
int main(int argc, char const *argv[]) //product + or -
{
	int *q;// build a pointer
	q=random01();
	for (int i = 0; i < 3; ++i)
	{
		printf("%dn",*(q+i)%2);//priint random number
	}
	char a[2]={'+','-'};
	printf("%cn%cn",a[*(q+0)%2],a[*(q+1)%2]);
	return 0;
}