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) 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;
}

3) If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

4) What would be the equivalent pointer expression for referring the array element a[i][j][k][l]

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

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