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) Which is an indirection operator among the following?

2) What will be the output of the program ?

  #include<stdio.h>
int main()
{
int x=30, *y, *z;
y=&x; /* Assume address of x is 500 and integer is 4 byte size */
z=y;
*y++=*z++;
x++;
printf("x=%d, y=%d, z=%d\n", x, y, z);
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) Which of the following does not initialize ptr to null (assuming variable declaration of a as int a=0;)?

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

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