double initial$\_$distance;

double position$1=0$;

double position$2=0$; $//$ Declare position$2$

cin $>>$ initial$\_$distance;

$//$ Update distance and position$1$

double distance $=$ initial$\_$distance;

distance $=$ distance $*0\mathrm{.}5$;

position$1=$ distance;

cout $<<$ position$1<<""<<$ position$2<<$ endl;

$//$ Update distance and position$2$

distance $=$ distance $*0\mathrm{.}5$; $//$ Assuming the same factor is applied

position$2=$ distance;

cout $<<$ position$1<<""<<$ position$2<<$ endl;

$//$ Update distance and position$1$

distance $=$ distance $*0\mathrm{.}5$; $//$ Assuming the same factor is applied

position$1+=$ distance;

cout $<<$ position$1<<""<<$ position$2<<$ endl;