If a variable is a pointer to a structure, then which of the following operator

If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

2) Comment on the following pointer declaration.

 int *ptr, p;

3) What will be the output of the following C code?

 #include <stdio.h>
 int x = 0;
 void main()
 {
     int *ptr = &x;
     printf("%p\n", ptr);
     x++;
     printf("%p\n ", ptr);
 }

4) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     int i=3, *j, k;
     j = &i;
     printf("%d\n", i**j*i+*j);
     return 0;
 }

5) What will be the output of the following C code?

 #include <stdio.h>
 void main()
 {
    int x = 0;
    int *ptr = &5;
    printf("%p\n", ptr);
 }