$4\mathrm{.}1\mathrm{.}2$: Prints powers of $2$ that are less than a given number.

$532810\mathrm{.}3747788.$qx$3$zqy$7$

Write a while loop that prints all powers of $2$ that are less than a given number n$.$ For example, if n is $100,$ print $1248163264.$