8_3计算圆周率.cpp

下楼问题

#include<iostream.h>
#include<stdlib.h>
#include<time.h>
# include<math.h>
void main()
{
	long k=0,c=0,d=0;
	float pai=0,x=0,y=0;
	srand((unsigned int)time(NULL));
	for (k=0;k<10000000;k++)
	{
		d=d+1;
		x=(float)rand()/32767;
	    y=(float)rand()/32767;
		if (sqrt(x*x+y*y)<=1)
			c=c+1;
	}
	pai=4.0f*c/d;
	cout<<"pai的近似值为"<<pai<<endl;
}