C programming Interview questions and answers: Pointer to array of structure in c programming

Pointer to array of structure: A pointer to an array which contents are pointer to structure is know pointer to array of structure.

What will be output if you will execute following code?

#include<stdio.h>

struct emp{

char *name;

int id;

};

int main(){

static struct emp e1={"A",1},e2={"B",2},e3={"C",3};

struct emp(*array[])={&e1,&e2,&e3};

struct emp(*(*ptr)[3])=&array;

printf("%s %d",(**(*ptr+1)).name,(*(*ptr+1))->id);

return 0;

}

Output: B 2

Explanation:

(**(*ptr+1)).name

=(**(*&array+1)).name //ptr=&array

=(**(array+1)).name //from rule *&p =p

=(*array[1]).name //from rule *(p+i)=p[i]

=(*&e2).name //array[1]=&e2

=e2.name=”B” //from rule *&p =p

(*(*ptr+1))->id

=(**(*ptr+1)).id //from rule -> = (*).

=e2.id=2

C programming Interview questions and answers