Consider the following lines of code:

int a $=5$;

double b $=10$;

double c $=$ a $/$ b;

c $=($int$)$c $-1$;

After these lines of code have been executed, the value of c is $\_\_\_\_\_.$

Group of answer choices

$-1$

$0\mathrm{.}5$

$0$

$1$

None of the above