#include

#include

static long num$\_$steps $=100000000$;

double step;

int main $()$

$\{$

int i;

double x$,$ pi$,$ sum $=0\mathrm{.}0$;

double start$\_$time, run$\_$time;

step $=1\mathrm{.}0/($double$)$ num$\_$steps;

start$\_$time $=$ omp$\_$get$\_$wtime$()$;$//$ this is the timer we want to use when using

OpemMP

for $($i$=1$;i$<=$ num$\_$steps; i$++)\{$

x $=($i$-0\mathrm{.}5)*$step;

sum $=$ sum $+4\mathrm{.}0/(1\mathrm{.}0+$x$*$x$)$;

$\}$

pi $=$ step $*$ sum;

run$\_$time $=$ omp$\_$get$\_$wtime$()-$ start$\_$time;

printf$("$

pi with $\%$ld steps is $\%$lf in $\%$lf seconds

$",$num$\_$steps,pi$,$run$\_$time$)$;

$\}$