Yes, but you can tell beforehand some events and hardcode them without checking them. i.e. it is 1 on startup and within first 0.5s, but then 10s later you just -know- it is 0 (and if it isn't, something is broken in the hardware.) so you could apply the routines that just assume it's 0 without checking and run a code that is modified accordingly and designated for that specific case. Although possible, it's extremely ugly, error-prone, inefficient and obscure technique and almost certainly not what the original post author wants.

#define V1 1
x=V1;
printf("%d",x);
#undef V1
#define V1 2
x=V1;
printf("%d",x);