How many bytes are occupied by near, far and huge pointers (DOS)?

How many bytes are occupied by near, far and huge pointers (DOS)?

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1) 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);
 }

2) 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?

3) 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);
 }

4) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     char str[20] = "Hello";
     char *const p=str;
     *p='M';
     printf("%s\n", str);
     return 0;
 }

5) In which header file is the NULL macro defined?