c++ - Trying to pass adress to a reffernce to a pointer -

why calling funk(&a) gives compile error

func(int * & data) {data++;}  int main(){  int = 5; int *p = &a; func(&a); //this gives compile error funk(p);  //this works fine  } 

error: invalid initialization of non-const reference of type ‘int*&’ rvalue of type ‘int*’

just error message explains, parameter needs reference variable, , &a not variable, it's an address of variable.