$5\mathrm{.}1$ What is the difference between the while loop and the do$-$while loop?

$[2$ Marks$]$

$5\mathrm{.}2$ Which loop should you use when you know the number of required iterations? $[2$ Marks$]$

$5\mathrm{.}3$ What data type do you use when you want to create a file stream object that can write data to a file?

$[1$ Mark$]$