If a variable is a pointer to a structure, then which of the following operator

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?

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

2) 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");
 }

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

 #include <stdio.h> int *f();
 int main()
 {
    int *p = f();
    printf("%d\n", *p);
 }

 int *f()
 {
    int *j = (int*)malloc(sizeof(int));
    *j = 10;
    return j;
 }

4) 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?

5) 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;
 }