Assume that total, hum$1,$ and num$2$ are int variables, with total $=2,$ num$1=3,$ and num $2=4.$ Show the new values of all variables changed by each of the following:

$12.$ total $=++$ num $1$ ;

$13.$ total $=$ num$2++$;

$14.$ total $**=5$;

$15.$ total $+=$ num $1-$ num $2**4$;

$16.$ total $=++$ num $1+$ num $2++$;

$17.$ total $+=3**$ num $1++-5$;