In below code,I think pointer pexam->pf and pf1 will be same, but why pexam->pf++ can't change? What mistake i make? Can someone will help me. thx!
/////////////////////////// struct tagEXAM { int x; void (**pf)(void); }; void fun1(void); void fun2(void); void (*code pf[])(void)= { fun1,fun2 }; struct tagEXAM code exam[] = { {1, pf} }; int x; void (**pf1)(void); struct tagEXAM* pexam; void main(void) { while (1) { pexam = exam; pf1 = pexam->pf;
(*pexam->pf)(); (*pf1)();
pexam->pf++; pf1++; (*pexam->pf)(); (*pf1)(); } } void fun1(void) { x = 1; } void fun2(void) { x = 2; }
While the choice of a '51 target is questionable when using function pointers, there doesn't appear to be anything particularly wrong with your code.
What do you mean by "can't change"?
You are trying to increment a pointer that is located in ROM. That's why it won't increment.
You are trying to increment a pointer that is located in ROM.
Well spotted.
struct tagEXAM code exam[] = { {1, pf} };