In which header file is the NULL macro defined?

In which header file is the NULL macro defined?

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1) 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;
 }

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

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

3) 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;
 }

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) Which of the following does not initialize ptr to null (assuming variable declaration of a as int a=0;)?