Consider a dashboard display that displays "normal" when brakes in the car operate normally and "emergency" when there is a failure. The intended behavior is that once "emergency" has been displayed, "normal" will not again be displayed. That is$,$ "emergency" remains on the display until the system is reset.

In the following code, assume that the variable display defines what is displayed. Whatever its value, that is what appears on the dashboard.

volatile static uint$8\_$t alerted; volatile static char$*$ display; void ISRA$()\{$

if alerted $=0$

display $=$ "normal";

$\}$

$\}$

void

display $=$ "emergency";

alerted $=1_{{?}_{?}}$

$\}$

void main$()\{$

alerted $=0_{{?}_{?}}$

$...$set up interrupts...

$...$enable interrupts...