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Pointers To Pointers - Questions and Answers

 

Practice these Pointers To Pointers under C Programming walk-in interview Questions/ examination questions with best tricks and short cuts with solution. Student (candidate) who want to crack the walk in interview, competitive exams and want to find short cuts and tricks to solve questions on Pointers To Pointers for following purpose.


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Here is list of Questions and Answers covering all key area of  Pointers To Pointers topic of C Programming:

 

1.

What is the output of this C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int a[3] = {1, 2, 3};
  5.         int *p = a;
  6.         int *r = &p;
  7.         printf("%d", (**r));
  8.     }

Answer: Option C

Explanation:

2.

Which of the following declaration throw run-time error?

Answer: Option D

Explanation:

3.

What is the output of this C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         int a = 1, b = 2, c = 3;
  5.         int *ptr1 = &a, *ptr2 = &b, *ptr3 = &c;
  6.         int **sptr = &ptr1; //-Ref
  7.         *sptr = ptr2;
  8.     }

Answer: Option D

Explanation:

4.

Comment on the output of this C code?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         int a = 10;
  5.         int **c -= &&a;
  6.     }

Answer: Option A

Explanation:

5.

What is the output of this C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int k = 5;
  5.         int *p = &k;
  6.         int **m  = &p;
  7.         printf("%d%d%d\n", k, *p, **p);
  8.     }

Answer: Option A

Explanation:

6.

What is the output of this C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int k = 5;
  5.         int *p = &k;
  6.         int **m  = &p;
  7.         printf("%d%d%d\n", k, *p, **m);
  8.     }

Answer: Option D

Explanation:

7.

What is the output of this C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int a[3] = {1, 2, 3};
  5.         int *p = a;
  6.         int **r = &p;
  7.         printf("%p %p", *r, a);
  8.     }

Answer: Option C

Explanation:

8.

How many number of pointer (*) does C have against a pointer variable declaration?

Answer: Option A

Explanation:

9.

What is the output of this C code?

  1.     #include <stdio.h>
  2.     void main()
  3.     {
  4.         int k = 5;
  5.         int *p = &k;
  6.         int **m  = &p;
  7.         **m = 6;
  8.         printf("%d\n", k);
  9.     }

Answer: Option B

Explanation:

10.

What substitution should be made to //-Ref such that ptr1 points to variable C?

  1.     #include <stdio.h>
  2.     int main()
  3.     {
  4.         int a = 1, b = 2, c = 3;
  5.         int *ptr1 = &a;
  6.         int **sptr = &ptr1;
  7.         //-Ref
  8.     }

Answer: Option C

Explanation: