$4\mathrm{.}2\mathrm{.}3$: Basic while loop expression.

Write a while loop that prints user$\_$num divided by $2$ until user$\_$num is less than $1.$ The value of user$\_$num changes inside of the loop.

Sample output with input: $20$

$10\mathrm{.}0$

$5\mathrm{.}0$

$2\mathrm{.}5$

$1\mathrm{.}25$

$0\mathrm{.}625$