Array of Pointers Pointing to an unknown location

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Category:Languages

I was practicing with array of pointers. i wrote a simple code.

#include<iostream> using namespace std;  int main(){      int a[3]={1,2,3};     int *b[3];      for(int i=0; i<3; i++){         b[i] = &a[i];     }      cout<<b; //This gives a confusing output     cout<<endl;      for(int i=0; i<3; i++){         cout<<b[i];         cout<<endl;     } } 

and Output is

0x6ffe10 0x6ffe30 0x6ffe34 0x6ffe38 

Now I don't understand where the b pointing. I know this sounds weird but i wanna know. where the b pointer pointing. The b[0], b[1], b[2] gives expected result.

 


b is an array of pointers to int. It's address is the address of the first pointer.

  • The first pointer b[0] is assigned the address of element a[0] (so b[0] points to 1).
  • b[1] is assigned the address of a[1] (so b[1] points to 2)
  • b[2] is assigned the address of a[2] (so b[2] points to 3)

In each case the pointer in the b array holds the address of the corresponding element within a. So if there are any changes made to the elements of a after your loop assigning the address in a to b, the value held in the memory location pointed to by the element of b will change, but the address for that value held by b will remain unchanged.

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