i want to write a C Program which reads d , l, n from the command line, where n

Question

i want to write a C Program which reads d , l, n from the command line, where n is the number of trials.

i want to use drand48(). This should be used within a subroutine which initialises the random number generator just once (using a static variable) from the clock.

Buffon's needle problem is as follows. The top of a table (furniture) is marked off, dividing it into parallel strips of width d. A needle of length l is repeatedly tossed onto the table. Estimate the probability of the needle landing on one of the dividing lines. Assuming that l

Explanation / Answer

Here is the estimation as per the formula

/*************/

/*
============================================================================
Name        : RandomC.c
Author      :
Version     :
Copyright   : Your copyright notice
Description : Hello World in C, Ansi-style
============================================================================
*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(void) {

   double d,l;
   int n,N;
   double y,theta;
   int k=0;
   double pi;
   printf("Enter d,l,n ");
   scanf("%lf%lf%d",&d,&l,&N);
   n=N;
   srand48(time(NULL));   //random number initialisation
   while(n>0){
       y=(int)(drand48()*100)%(int)d; //generate y
       theta=(double)((int)(drand48()*1000)%157)/100; //geerate theta; 157 is pi/2*100
       if(y<=l*sin(theta))
           k++;
       n--;
   }
   pi=2*l*N/(k*d);
   printf("Pi: %f ",pi);
   return EXIT_SUCCESS;
}

/************/output

Enter d,l,n 5 4 100000
Pi: 2.786534

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