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Consider the following 'C' program fragment :

if(tPTR ! = NULL)
    * tPTR = NULL;
else
    * tPTR = NULL;

Select the following statements that are having same effect :

(i) if (tPTR) * tPTR = NULL;
else * tPTR = NULL
(ii) *tPTR = NULL;
(iii) if (!tPTR) * tPTR = NULL;
else * tPTR = NULL;
(iv) if (tPTR = = NULL) * tPTR = NULL;
else * tPTR = NULL;

  • A.(i) and (ii)
  • B.(i), (ii), (iii) and (iv)
  • C.(ii), (iii) and (iv)
  • D.(ii) only

Answer: B

All four have the same effect, so the answer is (i), (ii), (iii) and (iv).

In the given fragment both branches of the if do the same thing, *tPTR = NULL;, so whatever the condition, the effect is just that assignment, which is statement (ii).

Statements (i), (iii) and (iv) also have identical branches. They test different conditions (tPTR non-null, tPTR null, tPTR equal to NULL), but since the same assignment runs either way, the condition changes nothing. The paper sets the operators != and == with a space inside them and leaves the semicolon off the end of (i); read as the intended C, every option naming fewer than four statements leaves out an equivalent one.

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