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Tip of the Day
Language: C++
Expertise: Beginner
May 26, 1998

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How to use a pointer to a pointer to an int

Question:
How do you use a pointer to a pointer to an int? Like this:
--------------
int **IntPtr;
--------------
How do you access the value "underneath" two pointers?

Answer:
You can deference a pointer to a variable using an asterisk (*). You can double up asterisks to dereference a pointer to a pointer to a variable.

The following code declares an integer, a pointer to an integer, and a pointer to a pointer to an integer. After initializing the pointers, the code then sets the value of the first integer through the pointer to a pointer to an integer. Finally, the code outputs the results of the first integer for verification.

int i;
int *iptr;
int **iptr2;

iptr = &i
iptr2 = &iptr
**iptr2 = 1234;

cout << i;
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