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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2) Which is an indirection operator among the following?

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

4) What will be the output of the following C code?

 #include <stdio.h>
int main()
{
int *ptr, a = 10;
ptr = &a;
*ptr += 1;
printf("%d,%d/n", *ptr, a);
}

5) What will be the output of the following C code?

 #include <stdio.h>
void main()
{
int x = 0;
int *ptr = &x;
printf("%d\n", *ptr);
}

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