/* Bai tap 1_29 - Tinh so PI voi sai so 0.0001 */

#include <stdio.h>

#include <math.h>

void main()

{

double PI = 1.0, n = 3.0;

int i = 0;

while (1.0/n > 0.0001)

{

if (i%2 == 0)

PI -= 1.0/n;

else

PI += 1.0/n;

n += 2;

i++;

}

PI *= 4.0;

printf("

So PI tinh toan duoc la : %lf", PI);

printf("

So M_PI trong C = %lf", M_PI);

getch();

}