#include <stdio.h>
#include <stdarg.h>
#include <time.h>
#define NINT 1000000000

int main(void);
double make_ssq (int);
void make_sum(int *, double *);

int main ()
/* This program calculates the variance of the first 10^9 integers */
/* using only one cpu on the Macintosh.                            */
/* To compile with the Absoft C compiler, use:                     */
/* acc -A -O uni.c -o uni.out                                      */
{
int n = NINT;
clock_t start_program, end_program;
double sum = 0.0, mean, ssq;
start_program = clock ();

/* calculate sum */
ssq = make_ssq (n);
/* calculate sum of squares */
make_sum (&n, &sum);
mean = sum / n;
printf("%15d %20.3f %20.3f\n", n, mean, (ssq/n)-(mean * mean));

end_program = clock ();
printf("\ntime in sec: %7.2f\n", (end_program-start_program)/60.);
return 1;
}


double
make_ssq (int n)
{
double s = 0.0;
int i;
for (i=0;i<n;i++)
     s+=(double) i*i;
return s;
}

void
make_sum (int *n, double *s)
{
int i;
for (i=0;i<*n;i++)
     *s+=(double) i;
}