what is a C code that solves these problems?

result as requested in each equation.

$1$

The required result on screen monitor is

First

Second

Third

$[2]$

$\frac{?}{?}*$ global variables$\frac{*}{}$

int $m=0$;

int $n=0$;

The required result on screen monitor is

$r=243$

$**$ The required result on screen monitor is

$r=9$

$r=12$

$r=3$

$**$ The order of the output is not important. So$,$ this output is also valid

$r=12$

$r=3$

$r=9$