In which header file is the NULL macro defined?

In which header file is the NULL macro defined?

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

2) What will be the output of the program ?

 #include<stdio.h>
 int main()
 {
     static char *s[] = {"black", "white", "pink", "violet"};
     char **ptr[] = {s+3, s+2, s+1, s}, ***p;
     p = ptr;
     ++p;
     printf("%s", **p+1);
     return 0;
 }

3) 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;
 }

4) What will be the output of the program If the integer is 4bytes long?

 #include<stdio.h>
 int main()
 {
     int ***r, **q, *p, i=8;
     p = &i;
     q = &p;
     r = &q;
     printf("%d, %d, %d\n", *p, **q, ***r);
     return 0;
 }

5) Can you combine the following two statements into one?

   char *p; 
   p = (char*) malloc(100);