#include <stdio.h>

#include <stdlib.h>

#include <time.h>


double distance(double x,double y);


int main()

{

int i,j,count=0;

double x,y,r=1;

srand(time(NULL));


for(j=100;;j+=j)

{

for(i=0;i<j;i++)

{

x=(double)rand()/(double)RAND_MAX;

y=(double)rand()/(double)RAND_MAX;



if(distance(x,y,r)<(r*r))

count++;

}


printf("파이값 : %lf \n",4*count/(j*r*r));

}

}


double distance(double x,double y,double r)

{

double result=((x-r)*(x-r)+(y-r)*(y-r));

return result;




3.14에 가까워져야하는데 2배인 6.28에가까워지네요...