Creating a pointer to a structure & printing the size of the pointer

Create a structure with member variables of your choice and define a structure object as "pointer to structure" & print the size of it + value it is pointing currently

Output:

size of the pointer to the structure is 4 bytes 
object pointer 's' to structure student now pointing (null)

Implementation:

#include <stdio.h> #include <stdlib.h> /* structure of a student */ struct student { int rollno; char name[100]; }; int main(void) { /* pointer to a structure student */ struct student *s; /* size of the pointer in typical or modern compiler is always 4 bytes */ /* but the address is not yet assigned to the pointer because, no structure memory block is created so far */ printf("size of the pointer to the structure is %d bytes ",sizeof(s)); /* here pointer 's' initially will be a NULL pointer */ printf("\nobject pointer 's' to structure student now pointing %s",s); return 0; }