#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
int main ()
{
    int in = 0;
    srand(time(NULL));

    for(int i = 0; i < 1000000; i++) {
        float x = (rand()%1000000)/1000000.0;
        float y = (rand()%1000000)/1000000.0;
        double r = sqrt((pow(x,2)+pow(y,2)));
        if(r <= 1) in++;
    }
    printf("percent error=%fn", ((((4*in/1000000.0)-3.141592)/3.141592)*100));
    printf("pi=%fn", (4*in/1000000.0));
    return 0;
}