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

main()
{
	float pi,sum = 0,dinom,term = 1,acc;
	clrscr();
	do
	{
		printf("\nEnter accuracy:");
		scanf("%f",&acc);
		if(acc<=0 || acc >=1)
			printf("\nAccuracy is greater than zero and less than unity");
	}
	while(acc<=0 || acc >=1);
	for(dinom = 1;term > acc;dinom++)
	{
		term = 6.0/(dinom*dinom);
		sum += term;
	}
	pi = sqrt(sum);
	printf("\nThe value of PI is %f",pi);
	printf("\n");
	getch();
}