what does the '->' in 'pid->iState' mean?

hi~ i've seen operator (?) in fair amount of c code have looked @ can't figure out means:

code: [select]

pid->istate

(context below)

code: [select]

pid->istate += error;
if (pid->istate > pid->imax)
pid->istate =
pid->imax;
else if (pid->istate

hi roy,

pid pointer structure , pid->istate reference member of structure called istate.

elsewhere in code definition of structure pid points to, there lots of ways like:

struct {
  int istate;
  int imax;
  // other elements....
} id, *pid;  // id structure, pid pointer structure

when code accesses structure directly, can this:
 id.istate = 1;
 
when has pointer structure, this:
 pid->istate = 1;

both change value of istate in id structure 1

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