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?

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

 #include <stdio.h>
 int main()
 {
    int i = 10;
    void *p = &i;
    printf("%d\n", (int)*p);
    return 0;
 }

2) What is (void*)0?

3) Comment on the following C statement.

  const int *ptr;

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

#include <stdio.h>
 int main()
 {
    char *p = NULL;
    char *q = 0;
    if (p)
 	  printf(" p ");
    else
       printf("nullp");
    if (q)
       printf("q\n");
    else
       printf(" nullq\n");
 }

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

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