C Programming Questions and Answers – Pointers to Pointers – 2

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This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Pointers to Pointers – 2”.

Pre-requisite for C Pointers to Pointers MCQ set: Video Tutorial on C Pointers.

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1. What substitution should be made to //-Ref such that ptr1 points to variable c in the following C code?

  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.     }

a) *sptr = &c;
b) **sptr = &c;
c) *ptr1 = &c;
d) none of the mentioned
View Answer

Answer: a
Explanation: None.
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2. Which of the following declaration will result in run-time error?
a) int **c = &c;
b) int **c = &*c;
c) int **c = **c;
d) none of the mentioned
View Answer

Answer: d
Explanation: None.
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3. Comment on the output of the following C code.

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

a) You cannot apply any arithmetic operand to a pointer
b) We don’t have address of an address operator
c) We have address of an address operator
d) None of the mentioned
View Answer

Answer: b
Explanation: None.
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4. What will be the output of the following C code?

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  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.     }

a) 5 5 5
b) 5 5 junk value
c) 5 junk junk
d) Compile time error
View Answer

Answer: a
Explanation: None.

5. What will be the output of the following 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.     }

a) 5 5 5
b) 5 5 junk value
c) 5 junk junk
d) Compile time error
View Answer

Answer: d
Explanation: None.

6. What will be the output of the following 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.     }

a) 5
b) Run time error
c) 6
d) Junk
View Answer

Answer: c
Explanation: None.

7. What will be the output of the following 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.     }

a) 1
b) Compile time error
c) Address of a
d) Junk value
View Answer

Answer: b
Explanation: None.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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