Write the following program using async so that each function can be run as a task?

#include

#include

using namespace std;

double funcA$($double a$)\{$

if $($a $<1)$

throw "less than $1"$;

return a$*$a;

$\}$

int main$()\{$

double dValue;

cin $>>$ dValue;

try $\{$

dValue $=$ funcA$($dValue$)$;

$\}$

catch $($const char $*$s$)\{$

cout $<<$ s $<<$ endl;

$\}$

return $0$;

$\}$