How to produce, using a pointer to a pointer, check for zero when dividing?

  • one
    Check if pointer points to null pointer or division by zero? - Ildar
  • one
    Clarify the question. What is the division of what, and what's the point? - drdaeman

2 answers 2

Like that

int x = 1; int *y = &x; int **z = &y; if (**z != 0) **z = 1 / **z;

z is a pointer to y , y is a pointer to x , and x is an integer that is checked for zero before division. Operations on **z equivalent to operations on x.

  • Better: <pre> int x = 1; int * y = & x; int ** z = & y; ... if (z! = NULL) if (* z! = NULL) // otherwise dereference the NULL pointer and come! // Well, or comparison with null_ptr - what is there in the PL. if (** z! = 0) ** z = 1 / ** z; </ pre> - gecube
 try { //Делаешь что надо } catch(Exception &e) { // Здесь что надо сделать если неполучилось }