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



Pointer to function
Pointer to array of function
Pointer to array of string
Pointer to structure
pointer to union
Multi level pointer
Pointer to array of pointer to string
Pointer to three dimentional array
Pointer to two dimensional array
Sorting of array using pointer
Pointer to array of array
Pointer to array of union
Pointer to array of structure
Pointer to array of character
Pointer to array of integer
C tutorial

No comments: