$12)$ What is in variable x after the following statements are executed?

int x $=2$;

x $*=$ x $+1$;

A$)3$ B$)6$ C$)2$ D$)4$ E$)5$

$13)$ What is the value of $($double$)5/2?$

A$)2$ B$)33$ C$)3\mathrm{.}0$ D$)2\mathrm{.}0$ E$)2\mathrm{.}5$

$14)$ What are the values of a and b after the following statements are executed?

int a $=3$;

int b $=$ a$--$;

A$)$ a$=3,$ b$=3$ B$)$ a$=3,$ b$=2$ C$)$ a$=2,$ b$=3$ D$)$ a$=2,$ b$=2$

$15)$ What is the value of i after this statement is executed?

double d $=123\mathrm{.}784$;

int i $=($int$)$ d;

A$)$ Error B$)123\mathrm{.}8$ C$)124$ D$)123$ E$)123\mathrm{.}784$