In which header file is the NULL macro defined?

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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;)?

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