Pointer to array of integer in c

Pointer to array of integers: A pointer to such an array which contents are integer numbers is known as pointer to array of integer.

What will be output if you will execute following code?


#include<stdio.h>

int main(){

static int i,j,k;

int *(*ptr)[];

int *array[3]={&i,&j,&k};

ptr=&array;

j=i+++k+10;

++(**ptr);

printf("%d",***ptr);


return 0;

}

Output: 10

Explanation:

In this example:

array []: It is array of size three and its content are address of integer.

ptr: It is pointer to array which content are address of integer.

Pictorial representation above declaration:

Note: In the above figure upper part of box represent content and lower part represent memory address. We have assumed arbitrary address.

j=i+++k+10

=i++ + k+10

=0 +0 +10=10

***ptr = *** (&array) //ptr=&array

= **array //From rule *&p=p

//From rule array [0] =*(array+0) and ++ (**ptr)

=*array [1]

=*&j

=j

=10

What will be output if you will execute following code?


#include<stdio.h>

int main(){

int i,j,k;

int *(*ptr)[];

int *array[3]={&i,&j,&k};

ptr=&array;

j=i+++k+10;

++(**ptr);

printf("%d",***ptr);


return 0;

}

Output: Compiler error

Explanation: Address of auto variable cannot be member of an array.