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Consider the following declarations of a few variables.

int (*p1)[3];
int (*p2)[3];
int (*t1)[2];
int (*t2)[2];

Let the initial values of $p1, p2, t2$ and $t1$ are $1000, 1036, 2000$ and $2040$ respectively.
Consider two statements below-

  • $\text{S1}:$ Value of $p2-p1$ is $3$
  • $\text{S2}:$ Value of $t1-t2$ is $5$

Choose the correct option-

  1. $\text{S1}$ is correct but $\text{S2}$ is incorrect
  2. $\text{S2}$ is correct but $\text{S1}$ is incorrect
  3. Both are correct
  4. Both are incorrect
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Both correct.
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1 Answer

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3 votes

Answer: C

Since pointer difference is asked so all the pointers $p1$, $p2$ are pointing to the same array similarly pointer $t1$, $t2$ is pointing to the same array.

int (*p1)[3]; // p1 is pointing to the array of 3 integers

int (*p2)[3]; // p2 is pointing to the array of 3 integers

$p1$ address is $1000$, $p2$ address is $1036$

$p2-p1 = \frac {1036-1000}{4*3} = \frac{36}{12} = 3$ (dividing by 4 because each integer is of 4B and by 3 because each pointer is pointing

                                                                                           to an array of 3 integers)

 

int (*t1)[2]; //t1 is pointing to an array of 2 integers

int (*t2)[2]; //t2 is pointing to an array of 2 integers

$t2$ address is $2000$, $t1$ address is $2040$

$t1-t2 = \frac{2040-2000}{4*2} = \frac{40}{8} = 5$

Answer:

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