why pointer to pointer is needed to allocate memory in function

Question

I have a segmentation fault in the code below, but after I changed it to pointer to pointer, it is fine. Could anybody give me any reason?

void memory(int *          


        

Answer 1

i corrected the code.. read the comment and all will be clear..

#include
#include
#include

using namespace std;


void memory(int* p, int size) {               //pointer to pointer` not needed
    try{
        p = new int[size] ;
    } catch(bad_alloc &e) {
       cout<