PRF192 ws4.q2

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

double myPi(double epsi);
int main() {
    system("cls");
    double pi, epsi;
    epsi = 0.00001;
    pi = myPi(epsi);
    printf(" pi = %lf\n", pi);

    printf("\n");
    return(0);
}

double myPi(double epsi) {
    double S,pi,a; int n;
    S = 0; n = 0;
    do {
        a = pow(-1,n) / (2*n+1);
        S += a;
        n++;
    } while (epsi < fabs(a));
    S *= 4;
    return (S);
}